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Page 1
Pinnacle Chemistry
Sol.286.(d) Steam distillation is
aseparation process that consists of
distilling water together with other
volatile and non-volatile components.
The coarse substance feels rough and
hard, used by gymnasts as it increases
the friction between the bar and the
gymnast's hands.
Q.287. Which of the following techniques
can be used for reducing the total
dissolved solids (TDS) in water?
(1) Ion Exchange
(2) Distillation
(3) Carding
SSC CGL 19/04/2022 (Afternoon)
(a) Only 1 (b) Only 3
(c) Both 1 and 2 (d) Both 2 and 3
Sol.287.(c) Both 1 and 2 . The TDS (Total
Dissolved Solids) level between 50-150 is
considered as the most suitable and
acceptable.
Q.288. Which among the following is
NOT true about a solution and the solute
concerned?
SSC CPO 24/11/2020 (Morning)
(a) The particles of the solute do not
scatter a beam of light
(b) The particles of the solute settle
down at the bottom when the solution
is kept undisturbed.
(c) The particles of the solute cannot be
seen with unaided eyes.
(d) A solution is a homogeneous mixture
Sol.288.(b) Only the particles of a Solute
in a Heterogeneous solution settle down
at the bottom when the solution is left
undisturbed. In a homogenous solution
the solute gets dissolved completely in
the solvent. For example salt or sugar in
water gets completely dissolved.
Q.289. Solubility of gases in liquids _____
with decrease in temperature.
SSC CPO 25/11/2020 (Evening)
(a) Remains constant
(b) First decreases and then increases
(c) Increases
(d) decreases
Sol.289.(c) Increases. Solubility of
gases in liquids increases with decrease
in temperature and it decreases with the
increase in temperature. Adding heat to
the solution provides thermal energy that
overcomes the attractive forces between
the gas and the solvent molecules.
Q.290. ____ Law of independent
migration of ions states that limiting
molar conductivity of an electrolyte can
be represented as the sum of the
individual contributions of the anion and
cation of the electrolyte.
SSC CPO 25/11/2020 (Evening)
(a) Dirac (b) Feynman
(c) Schrodinger (d) Kohlrausch
Sol.290.(d) Kohlrausch Law is
dependent on the nature of the solvent
and on the potential gradient but not on
the other ions present. Kohlrausch Law
helps in determination of limiting molar
conductivities for any electrolyte. Weak
electrolytes have lower molar
conductivities and lower degree of
dissociation at higher concentrations.
Chemistry in Everyday life
Q.291. Match List-I with List-II.
List-I
(Chemical compound)
List-II
(Spices)
A. Curcuminoids 1. Cardamom
B. 1, 8-cineole 2. Black pepper
C. Eugenol 3. Turmeric
D. Piperine 4. Cloves
SSC CGL Tier II 26/10/2023
(a) A - 4, B - 3, C - 2, D - 1
(b) A - 3, B - 1, C - 4, D - 2
(c) A - 3, B - 1, C - 2, D - 4
(d) A - 1, B - 4, C - 3, D - 2
Sol.291.(b) A - 3, B - 1, C - 4, D - 2.
Chemical Constituents of spices :
Coriander - Linalool, borneol, terpineol,
cumene. Saffron - Crocins, safranal,
salicylic, vanillic acid. Mustard seeds -
Allyl isothiocyanate. Garlic - Allicin.
Ginger - Gingerol. Cumin - Cumin
aldehyde.
Q.292. Out of the following, identify the
process that does NOT involve a
chemical reaction.
SSC Stenographer 12/10/2023 (Afternoon)
(a) Cloth cleaning using detergent
(b) Ripening of mango
(c) Change of colour of turmeric due to
soap
(d) Cooling effect of nail polish remover
Sol.292.(d) Cooling effect of nail polish
remover . Chemical reactions : It is a
reaction in which the bonds are broken
within reactant molecules, and new
bonds are formed within product
molecules in order to form a new
substance. Examples - Cooking food,
Cleaning clothes, Burning fuel, Rusting of
iron, Photosynthesis in plants, Digestion,
Combustion, Boiling an egg, Ripening of
fruits.
Q.293. Which chemical compound is
present in hard plastic such as drinking
water bottles and many household
items?
SSC Stenographer 13/10/2023 (Morning)
(a) Bisphenol A (b) Tri?uralin
(c) Chrome alum (d) Heptachlor
Sol.293.(a) Bisphenol A (BPA). Other
uses - Used in beverage containers,
compact disks, plastic dinnerware,
impact -resistant safety equipment,
automobile parts, and toys. BPA is toxic
for humans and animals. Uses of some
compounds : Tri?uralin - Used as
herbicide. Chrome alum - In the tanning
of leather. Heptachlor - As a soil and
seed treatment and for termite control.
Q.294. Which of the following is
considered a chemical hazard in food?
SSC Stenographer 13/10/2023 (Afternoon)
(a) Stones (b) sand
(c) Jewellery (d) Pesticides residues
Sol.294.(d) Pesticides residues.
Pesticides are one of the major inputs
used for increasing agricultural
productivity of crops. The pesticide
residues, left to variable extent in the
food materials after harvesting, are
beyond the control of consumers and
have deleterious effects on human
health. Pesticides are chemical
compounds that are used to kill pests,
including insects, rodents, fungi and
unwanted plants (weeds). Examples of
synthetic chemical pesticides are DDT,
Heptachlor, Chlordane.
Q.295. Which of the following is NOT a
food preservative?
SSC CPO 03/10/2023 (Evening)
(a) Aqua regia (b) Sodium nitrite
(c) Vinegar (d) Sodium chloride
Sol.295.(a) Aqua Regia. It is used for
puri?cation purposes of gold and
platinum. It is a mixture of nitric acid
(HNO
3
) and hydrochloric acid (HCl) in the
ratio of 1:3. Sodium Nitrate (Chile
Saltpetre) - NaNO
3
. Vinegar (Acetic acid)
- CH
3
COOH. Sodium Chloride (Salt) -
NaCl.
Q.296. Which gas is the major
component of biogas?
SSC CHSL 02/08/2023 (4th shift)
(a) CNG (b) Methane
(c) Hydrogen (d) LPG
Sol.296.(b) Methane (CH
4
). It has a high
heat of combustion (CH
4
+ 2O
2
? CO
2
+
2H
2
O + heat). It is used as fuel. Biogas is
formed by the decomposition of organic
matter with the action of bacteria in the
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Page 2
Pinnacle Chemistry
Sol.286.(d) Steam distillation is
aseparation process that consists of
distilling water together with other
volatile and non-volatile components.
The coarse substance feels rough and
hard, used by gymnasts as it increases
the friction between the bar and the
gymnast's hands.
Q.287. Which of the following techniques
can be used for reducing the total
dissolved solids (TDS) in water?
(1) Ion Exchange
(2) Distillation
(3) Carding
SSC CGL 19/04/2022 (Afternoon)
(a) Only 1 (b) Only 3
(c) Both 1 and 2 (d) Both 2 and 3
Sol.287.(c) Both 1 and 2 . The TDS (Total
Dissolved Solids) level between 50-150 is
considered as the most suitable and
acceptable.
Q.288. Which among the following is
NOT true about a solution and the solute
concerned?
SSC CPO 24/11/2020 (Morning)
(a) The particles of the solute do not
scatter a beam of light
(b) The particles of the solute settle
down at the bottom when the solution
is kept undisturbed.
(c) The particles of the solute cannot be
seen with unaided eyes.
(d) A solution is a homogeneous mixture
Sol.288.(b) Only the particles of a Solute
in a Heterogeneous solution settle down
at the bottom when the solution is left
undisturbed. In a homogenous solution
the solute gets dissolved completely in
the solvent. For example salt or sugar in
water gets completely dissolved.
Q.289. Solubility of gases in liquids _____
with decrease in temperature.
SSC CPO 25/11/2020 (Evening)
(a) Remains constant
(b) First decreases and then increases
(c) Increases
(d) decreases
Sol.289.(c) Increases. Solubility of
gases in liquids increases with decrease
in temperature and it decreases with the
increase in temperature. Adding heat to
the solution provides thermal energy that
overcomes the attractive forces between
the gas and the solvent molecules.
Q.290. ____ Law of independent
migration of ions states that limiting
molar conductivity of an electrolyte can
be represented as the sum of the
individual contributions of the anion and
cation of the electrolyte.
SSC CPO 25/11/2020 (Evening)
(a) Dirac (b) Feynman
(c) Schrodinger (d) Kohlrausch
Sol.290.(d) Kohlrausch Law is
dependent on the nature of the solvent
and on the potential gradient but not on
the other ions present. Kohlrausch Law
helps in determination of limiting molar
conductivities for any electrolyte. Weak
electrolytes have lower molar
conductivities and lower degree of
dissociation at higher concentrations.
Chemistry in Everyday life
Q.291. Match List-I with List-II.
List-I
(Chemical compound)
List-II
(Spices)
A. Curcuminoids 1. Cardamom
B. 1, 8-cineole 2. Black pepper
C. Eugenol 3. Turmeric
D. Piperine 4. Cloves
SSC CGL Tier II 26/10/2023
(a) A - 4, B - 3, C - 2, D - 1
(b) A - 3, B - 1, C - 4, D - 2
(c) A - 3, B - 1, C - 2, D - 4
(d) A - 1, B - 4, C - 3, D - 2
Sol.291.(b) A - 3, B - 1, C - 4, D - 2.
Chemical Constituents of spices :
Coriander - Linalool, borneol, terpineol,
cumene. Saffron - Crocins, safranal,
salicylic, vanillic acid. Mustard seeds -
Allyl isothiocyanate. Garlic - Allicin.
Ginger - Gingerol. Cumin - Cumin
aldehyde.
Q.292. Out of the following, identify the
process that does NOT involve a
chemical reaction.
SSC Stenographer 12/10/2023 (Afternoon)
(a) Cloth cleaning using detergent
(b) Ripening of mango
(c) Change of colour of turmeric due to
soap
(d) Cooling effect of nail polish remover
Sol.292.(d) Cooling effect of nail polish
remover . Chemical reactions : It is a
reaction in which the bonds are broken
within reactant molecules, and new
bonds are formed within product
molecules in order to form a new
substance. Examples - Cooking food,
Cleaning clothes, Burning fuel, Rusting of
iron, Photosynthesis in plants, Digestion,
Combustion, Boiling an egg, Ripening of
fruits.
Q.293. Which chemical compound is
present in hard plastic such as drinking
water bottles and many household
items?
SSC Stenographer 13/10/2023 (Morning)
(a) Bisphenol A (b) Tri?uralin
(c) Chrome alum (d) Heptachlor
Sol.293.(a) Bisphenol A (BPA). Other
uses - Used in beverage containers,
compact disks, plastic dinnerware,
impact -resistant safety equipment,
automobile parts, and toys. BPA is toxic
for humans and animals. Uses of some
compounds : Tri?uralin - Used as
herbicide. Chrome alum - In the tanning
of leather. Heptachlor - As a soil and
seed treatment and for termite control.
Q.294. Which of the following is
considered a chemical hazard in food?
SSC Stenographer 13/10/2023 (Afternoon)
(a) Stones (b) sand
(c) Jewellery (d) Pesticides residues
Sol.294.(d) Pesticides residues.
Pesticides are one of the major inputs
used for increasing agricultural
productivity of crops. The pesticide
residues, left to variable extent in the
food materials after harvesting, are
beyond the control of consumers and
have deleterious effects on human
health. Pesticides are chemical
compounds that are used to kill pests,
including insects, rodents, fungi and
unwanted plants (weeds). Examples of
synthetic chemical pesticides are DDT,
Heptachlor, Chlordane.
Q.295. Which of the following is NOT a
food preservative?
SSC CPO 03/10/2023 (Evening)
(a) Aqua regia (b) Sodium nitrite
(c) Vinegar (d) Sodium chloride
Sol.295.(a) Aqua Regia. It is used for
puri?cation purposes of gold and
platinum. It is a mixture of nitric acid
(HNO
3
) and hydrochloric acid (HCl) in the
ratio of 1:3. Sodium Nitrate (Chile
Saltpetre) - NaNO
3
. Vinegar (Acetic acid)
- CH
3
COOH. Sodium Chloride (Salt) -
NaCl.
Q.296. Which gas is the major
component of biogas?
SSC CHSL 02/08/2023 (4th shift)
(a) CNG (b) Methane
(c) Hydrogen (d) LPG
Sol.296.(b) Methane (CH
4
). It has a high
heat of combustion (CH
4
+ 2O
2
? CO
2
+
2H
2
O + heat). It is used as fuel. Biogas is
formed by the decomposition of organic
matter with the action of bacteria in the
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Pinnacle Chemistry
absence of oxygen. The major
components of biogas - Methane
(50-75%), Carbon dioxide (25-50%),
Nitrogen (2-8%). Compressed Natural
Gas (CNG) consists of about 80-90%
methane. Liqui?ed Petroleum Gas (LPG)
consists of a compressed mixture of
propane and butane in liquid form.
Hydrogen is a clean fuel that, when
consumed in a fuel cell, produces only
water.
Q.297. Hardness of water is expressed in
terms of:
SSC CHSL 04/08/2023 (1st shift)
(a) mole (b) molarity
(c) ppm (d) normality
Sol.297.(c) ppm (parts per million) -
Ratio between the number of parts of
solids/solute to a million parts of total
volume. Water hardness is the amount of
dissolved calcium and magnesium in the
water. Mole (SI unit of amount of
substance) - Amount of a chemical
substance that contains as many
elementary entities (atoms, molecules,
ions, electrons). Molarity is a unit of
concentration expressed as the number
of moles of dissolved solute per litre of
solution. Normality - The number of gram
equivalents weights of a solute present
in one litre of a solvent.
Q.298. What kind of smell do Esters
have?
SSC CHSL 04/08/2023 (4th shift)
(a) Sweet smell like fruits
(b) Rotten egg smell
(c) Floral smell
(d) Pungent smell
Sol.298.(a) Sweet smells like fruits. The
group of chemical compounds which are
formed by bonding an alcohol group with
a group of organic acids by losing water
molecules is called Esters . Other
chemical compounds and its Smell:
Terpenes - Floral, Rose, Lemon; Amines -
Fishy, Rotting meat; Aldehydes - Grassy,
Floral; Chlorine gas - Pungent, Irritating
odour.
Q.299. When milk is converted into curd,
which type of change is it?
SSC CHSL 09/08/2023 (4th shift)
(a) Reversible change
(b) Physical change
(c) Isothermal change
(d) Chemical change
Sol.299.(d) Chemical change - A change
in which one or more new substances
are formed. Curd is formed through the
fermentation of milk by lactic acid
bacteria, primarily Lactobacillus, which
convert lactose into lactic acid, causing
the milk proteins to denature and
coagulate.
Q.300. Which of the following is the
product as a result of the process of
hydrolysis of orthoclase.
SSC CHSL 10/08/2023 (4th shift)
(a) Limonite (b) Magnesite
(c) Gypsum (d) Kaolinite
Sol.300.(d) Kaolinite (Al
2
Si
2
O
5
(OH)
4
) : A
clay mineral It's commonly found in soils
and sedimentary rocks. Used in - Rubber,
paint, paper making, and as a ?ller in
some products. Orthoclase (KAlSi
3
O
8
): A
common type of feldspar mineral (a
group of rock-forming minerals).
Magnesite (MgCO
3
). Gypsum
(CaSO
4
·2H
2
O): It is added to cement to
slow down the rate of setting.
Q.301. When camphor is heated, which
of the following changes will take place?
SSC CHSL 11/08/2023 (3rd shift)
(a) Solid to gas
(b) Solid to liquid to gas
(c) Liquid to gas
(d) Solid to liquid
Sol.301.(a) Solid to gas. If camphor
vapours are cooled, they change back to
the solid crystalline state.
Q.302. Which of the following metal salts
is responsible for permanent hardness in
water?
SSC CHSL 14/08/2023 (4th shift)
(a) KCI (b) NaCl (c) Ca(HCO
3
)
2
(d) CaCl
2
Sol.302.(d) CaCl
2
(Calcium chloride).
Hardness of water is due to the presence
of soluble bicarbonates, chlorides and
sulphates of calcium and magnesium.
Types of Hardness: Temporary (presence
of magnesium and calcium
bicarbonates) and Permanent (presence
of soluble salts of magnesium and
calcium). KCl - Potassium chloride, NaCl -
Sodium chloride (Common Salt).
Ca(HCO
3
)
2
- Calcium bicarbonate or
Calcium hydrogencarbonate.
Q.303. What is the product of the
reaction when anhydrite undergoes
hydration?
SSC CHSL 03/08/2023 (1st shift)
(a) Limonite (b) Magnesite
(c) Kaolin (d) Gypsum
Sol.303.(d) Gypsum (CaSO
4
.2H
2
O) :
Calcium sulphate (CaSO
4
) and water
(H
2
O) make up gypsum. Limonite forms
through the weathering of iron-bearing
minerals such as pyrite, magnetite, and
hematite under conditions of low
temperature and low oxygen. Uses -
Pigment, Cement, Soil conditioner, Water
treatment, Scienti?c research. Magnesite
is formed when magnesium-rich rocks
are altered by metamorphism or
chemical weathering. Used as a binding
agent in ?ooring. Kaolin is a rock from
which the clay mineral kaolinite is
derived. Used as the principal ingredient
in porcelain tableware.
Q.304. Which mineral salt is dissolved in
major amount in ocean water?
SSC CHSL 03/08/2023 (2nd shift)
(a) Calcium chloride
(b) Calcium carbonate
(c) Sodium chloride
(d) Calcium sulphate
Sol.304.(c) Sodium chloride (NaCl). It is
also known as table salt. Commonly
used as a condiment and food
preservative. Some of the minerals that
are found in the ocean water - Chloride,
Sodium, Magnesium, Sulphur, Calcium,
Bromine, etc. About 97% of the Earth’s
surface is found in Ocean.
Q.305. Which of the following chemicals
is used as a preservative to slow
browning and discolouration in foods
and beverages during preparation,
storage and distribution ?
SSC CGL 17/07/2023 (2nd shift)
(a) Nitrous oxide (b) Phosgene
(c) Sulphites (d) Chlorine
Sol.305.(c) Sulphites. Other Food
preservatives : Benzoic acid, Sodium
benzoate, nitrites, sodium sorbate and
potassium sorbate. Nitrous oxide (N
2
O) -
Laughing gas. Uses - Anaesthetic,
Semiconductor manufacturing industry,
Rocket motors as an oxidiser. Phosgene
(COCl
2
) also called Carbonyl chloride.
Uses - Dyestuffs, isocyanates, pesticides
and pharmaceuticals. Chlorine (Cl
2
) is
used in water treatment, bleaching and
disinfectants.
Q.306. Which sodium compound is the
most popular additive to various items
such as sauces, salad dressings and
beverages for its preservative action?
SSC CGL 17/07/2023 (3rd shift)
(a) Sodium bicarbonate
(b) Sodium ?uoride
(c) Sodium hypochlorite
(d) Sodium benzoate
Sol.306.(d) Sodium benzoate
(C
6
H
5
COONa). Also known as benzoate
of soda, a white crystalline chemical
used in foods, such as soda, lemon juice,
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Page 3
Pinnacle Chemistry
Sol.286.(d) Steam distillation is
aseparation process that consists of
distilling water together with other
volatile and non-volatile components.
The coarse substance feels rough and
hard, used by gymnasts as it increases
the friction between the bar and the
gymnast's hands.
Q.287. Which of the following techniques
can be used for reducing the total
dissolved solids (TDS) in water?
(1) Ion Exchange
(2) Distillation
(3) Carding
SSC CGL 19/04/2022 (Afternoon)
(a) Only 1 (b) Only 3
(c) Both 1 and 2 (d) Both 2 and 3
Sol.287.(c) Both 1 and 2 . The TDS (Total
Dissolved Solids) level between 50-150 is
considered as the most suitable and
acceptable.
Q.288. Which among the following is
NOT true about a solution and the solute
concerned?
SSC CPO 24/11/2020 (Morning)
(a) The particles of the solute do not
scatter a beam of light
(b) The particles of the solute settle
down at the bottom when the solution
is kept undisturbed.
(c) The particles of the solute cannot be
seen with unaided eyes.
(d) A solution is a homogeneous mixture
Sol.288.(b) Only the particles of a Solute
in a Heterogeneous solution settle down
at the bottom when the solution is left
undisturbed. In a homogenous solution
the solute gets dissolved completely in
the solvent. For example salt or sugar in
water gets completely dissolved.
Q.289. Solubility of gases in liquids _____
with decrease in temperature.
SSC CPO 25/11/2020 (Evening)
(a) Remains constant
(b) First decreases and then increases
(c) Increases
(d) decreases
Sol.289.(c) Increases. Solubility of
gases in liquids increases with decrease
in temperature and it decreases with the
increase in temperature. Adding heat to
the solution provides thermal energy that
overcomes the attractive forces between
the gas and the solvent molecules.
Q.290. ____ Law of independent
migration of ions states that limiting
molar conductivity of an electrolyte can
be represented as the sum of the
individual contributions of the anion and
cation of the electrolyte.
SSC CPO 25/11/2020 (Evening)
(a) Dirac (b) Feynman
(c) Schrodinger (d) Kohlrausch
Sol.290.(d) Kohlrausch Law is
dependent on the nature of the solvent
and on the potential gradient but not on
the other ions present. Kohlrausch Law
helps in determination of limiting molar
conductivities for any electrolyte. Weak
electrolytes have lower molar
conductivities and lower degree of
dissociation at higher concentrations.
Chemistry in Everyday life
Q.291. Match List-I with List-II.
List-I
(Chemical compound)
List-II
(Spices)
A. Curcuminoids 1. Cardamom
B. 1, 8-cineole 2. Black pepper
C. Eugenol 3. Turmeric
D. Piperine 4. Cloves
SSC CGL Tier II 26/10/2023
(a) A - 4, B - 3, C - 2, D - 1
(b) A - 3, B - 1, C - 4, D - 2
(c) A - 3, B - 1, C - 2, D - 4
(d) A - 1, B - 4, C - 3, D - 2
Sol.291.(b) A - 3, B - 1, C - 4, D - 2.
Chemical Constituents of spices :
Coriander - Linalool, borneol, terpineol,
cumene. Saffron - Crocins, safranal,
salicylic, vanillic acid. Mustard seeds -
Allyl isothiocyanate. Garlic - Allicin.
Ginger - Gingerol. Cumin - Cumin
aldehyde.
Q.292. Out of the following, identify the
process that does NOT involve a
chemical reaction.
SSC Stenographer 12/10/2023 (Afternoon)
(a) Cloth cleaning using detergent
(b) Ripening of mango
(c) Change of colour of turmeric due to
soap
(d) Cooling effect of nail polish remover
Sol.292.(d) Cooling effect of nail polish
remover . Chemical reactions : It is a
reaction in which the bonds are broken
within reactant molecules, and new
bonds are formed within product
molecules in order to form a new
substance. Examples - Cooking food,
Cleaning clothes, Burning fuel, Rusting of
iron, Photosynthesis in plants, Digestion,
Combustion, Boiling an egg, Ripening of
fruits.
Q.293. Which chemical compound is
present in hard plastic such as drinking
water bottles and many household
items?
SSC Stenographer 13/10/2023 (Morning)
(a) Bisphenol A (b) Tri?uralin
(c) Chrome alum (d) Heptachlor
Sol.293.(a) Bisphenol A (BPA). Other
uses - Used in beverage containers,
compact disks, plastic dinnerware,
impact -resistant safety equipment,
automobile parts, and toys. BPA is toxic
for humans and animals. Uses of some
compounds : Tri?uralin - Used as
herbicide. Chrome alum - In the tanning
of leather. Heptachlor - As a soil and
seed treatment and for termite control.
Q.294. Which of the following is
considered a chemical hazard in food?
SSC Stenographer 13/10/2023 (Afternoon)
(a) Stones (b) sand
(c) Jewellery (d) Pesticides residues
Sol.294.(d) Pesticides residues.
Pesticides are one of the major inputs
used for increasing agricultural
productivity of crops. The pesticide
residues, left to variable extent in the
food materials after harvesting, are
beyond the control of consumers and
have deleterious effects on human
health. Pesticides are chemical
compounds that are used to kill pests,
including insects, rodents, fungi and
unwanted plants (weeds). Examples of
synthetic chemical pesticides are DDT,
Heptachlor, Chlordane.
Q.295. Which of the following is NOT a
food preservative?
SSC CPO 03/10/2023 (Evening)
(a) Aqua regia (b) Sodium nitrite
(c) Vinegar (d) Sodium chloride
Sol.295.(a) Aqua Regia. It is used for
puri?cation purposes of gold and
platinum. It is a mixture of nitric acid
(HNO
3
) and hydrochloric acid (HCl) in the
ratio of 1:3. Sodium Nitrate (Chile
Saltpetre) - NaNO
3
. Vinegar (Acetic acid)
- CH
3
COOH. Sodium Chloride (Salt) -
NaCl.
Q.296. Which gas is the major
component of biogas?
SSC CHSL 02/08/2023 (4th shift)
(a) CNG (b) Methane
(c) Hydrogen (d) LPG
Sol.296.(b) Methane (CH
4
). It has a high
heat of combustion (CH
4
+ 2O
2
? CO
2
+
2H
2
O + heat). It is used as fuel. Biogas is
formed by the decomposition of organic
matter with the action of bacteria in the
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absence of oxygen. The major
components of biogas - Methane
(50-75%), Carbon dioxide (25-50%),
Nitrogen (2-8%). Compressed Natural
Gas (CNG) consists of about 80-90%
methane. Liqui?ed Petroleum Gas (LPG)
consists of a compressed mixture of
propane and butane in liquid form.
Hydrogen is a clean fuel that, when
consumed in a fuel cell, produces only
water.
Q.297. Hardness of water is expressed in
terms of:
SSC CHSL 04/08/2023 (1st shift)
(a) mole (b) molarity
(c) ppm (d) normality
Sol.297.(c) ppm (parts per million) -
Ratio between the number of parts of
solids/solute to a million parts of total
volume. Water hardness is the amount of
dissolved calcium and magnesium in the
water. Mole (SI unit of amount of
substance) - Amount of a chemical
substance that contains as many
elementary entities (atoms, molecules,
ions, electrons). Molarity is a unit of
concentration expressed as the number
of moles of dissolved solute per litre of
solution. Normality - The number of gram
equivalents weights of a solute present
in one litre of a solvent.
Q.298. What kind of smell do Esters
have?
SSC CHSL 04/08/2023 (4th shift)
(a) Sweet smell like fruits
(b) Rotten egg smell
(c) Floral smell
(d) Pungent smell
Sol.298.(a) Sweet smells like fruits. The
group of chemical compounds which are
formed by bonding an alcohol group with
a group of organic acids by losing water
molecules is called Esters . Other
chemical compounds and its Smell:
Terpenes - Floral, Rose, Lemon; Amines -
Fishy, Rotting meat; Aldehydes - Grassy,
Floral; Chlorine gas - Pungent, Irritating
odour.
Q.299. When milk is converted into curd,
which type of change is it?
SSC CHSL 09/08/2023 (4th shift)
(a) Reversible change
(b) Physical change
(c) Isothermal change
(d) Chemical change
Sol.299.(d) Chemical change - A change
in which one or more new substances
are formed. Curd is formed through the
fermentation of milk by lactic acid
bacteria, primarily Lactobacillus, which
convert lactose into lactic acid, causing
the milk proteins to denature and
coagulate.
Q.300. Which of the following is the
product as a result of the process of
hydrolysis of orthoclase.
SSC CHSL 10/08/2023 (4th shift)
(a) Limonite (b) Magnesite
(c) Gypsum (d) Kaolinite
Sol.300.(d) Kaolinite (Al
2
Si
2
O
5
(OH)
4
) : A
clay mineral It's commonly found in soils
and sedimentary rocks. Used in - Rubber,
paint, paper making, and as a ?ller in
some products. Orthoclase (KAlSi
3
O
8
): A
common type of feldspar mineral (a
group of rock-forming minerals).
Magnesite (MgCO
3
). Gypsum
(CaSO
4
·2H
2
O): It is added to cement to
slow down the rate of setting.
Q.301. When camphor is heated, which
of the following changes will take place?
SSC CHSL 11/08/2023 (3rd shift)
(a) Solid to gas
(b) Solid to liquid to gas
(c) Liquid to gas
(d) Solid to liquid
Sol.301.(a) Solid to gas. If camphor
vapours are cooled, they change back to
the solid crystalline state.
Q.302. Which of the following metal salts
is responsible for permanent hardness in
water?
SSC CHSL 14/08/2023 (4th shift)
(a) KCI (b) NaCl (c) Ca(HCO
3
)
2
(d) CaCl
2
Sol.302.(d) CaCl
2
(Calcium chloride).
Hardness of water is due to the presence
of soluble bicarbonates, chlorides and
sulphates of calcium and magnesium.
Types of Hardness: Temporary (presence
of magnesium and calcium
bicarbonates) and Permanent (presence
of soluble salts of magnesium and
calcium). KCl - Potassium chloride, NaCl -
Sodium chloride (Common Salt).
Ca(HCO
3
)
2
- Calcium bicarbonate or
Calcium hydrogencarbonate.
Q.303. What is the product of the
reaction when anhydrite undergoes
hydration?
SSC CHSL 03/08/2023 (1st shift)
(a) Limonite (b) Magnesite
(c) Kaolin (d) Gypsum
Sol.303.(d) Gypsum (CaSO
4
.2H
2
O) :
Calcium sulphate (CaSO
4
) and water
(H
2
O) make up gypsum. Limonite forms
through the weathering of iron-bearing
minerals such as pyrite, magnetite, and
hematite under conditions of low
temperature and low oxygen. Uses -
Pigment, Cement, Soil conditioner, Water
treatment, Scienti?c research. Magnesite
is formed when magnesium-rich rocks
are altered by metamorphism or
chemical weathering. Used as a binding
agent in ?ooring. Kaolin is a rock from
which the clay mineral kaolinite is
derived. Used as the principal ingredient
in porcelain tableware.
Q.304. Which mineral salt is dissolved in
major amount in ocean water?
SSC CHSL 03/08/2023 (2nd shift)
(a) Calcium chloride
(b) Calcium carbonate
(c) Sodium chloride
(d) Calcium sulphate
Sol.304.(c) Sodium chloride (NaCl). It is
also known as table salt. Commonly
used as a condiment and food
preservative. Some of the minerals that
are found in the ocean water - Chloride,
Sodium, Magnesium, Sulphur, Calcium,
Bromine, etc. About 97% of the Earth’s
surface is found in Ocean.
Q.305. Which of the following chemicals
is used as a preservative to slow
browning and discolouration in foods
and beverages during preparation,
storage and distribution ?
SSC CGL 17/07/2023 (2nd shift)
(a) Nitrous oxide (b) Phosgene
(c) Sulphites (d) Chlorine
Sol.305.(c) Sulphites. Other Food
preservatives : Benzoic acid, Sodium
benzoate, nitrites, sodium sorbate and
potassium sorbate. Nitrous oxide (N
2
O) -
Laughing gas. Uses - Anaesthetic,
Semiconductor manufacturing industry,
Rocket motors as an oxidiser. Phosgene
(COCl
2
) also called Carbonyl chloride.
Uses - Dyestuffs, isocyanates, pesticides
and pharmaceuticals. Chlorine (Cl
2
) is
used in water treatment, bleaching and
disinfectants.
Q.306. Which sodium compound is the
most popular additive to various items
such as sauces, salad dressings and
beverages for its preservative action?
SSC CGL 17/07/2023 (3rd shift)
(a) Sodium bicarbonate
(b) Sodium ?uoride
(c) Sodium hypochlorite
(d) Sodium benzoate
Sol.306.(d) Sodium benzoate
(C
6
H
5
COONa). Also known as benzoate
of soda, a white crystalline chemical
used in foods, such as soda, lemon juice,
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pickles, jelly, salad dressing, soy sauce.
Sodium bicarbonate (NaHCO3), also
known as baking soda used in cooking,
disinfectant, pest control, teeth hygiene,
indigestion. Sodium ?uoride (NaF) a
colourless or white solid that is readily
soluble in water. It is soluble in water.
Sodium hypochlorite (NaClO) : An
inorganic chemical compound used as a
disinfecting agent.
Q.307. Pepperonil, ethyl acetate,
butyraldehyde and nitrate are some
common adulterants used in:
SSC CGL 19/07/2023 (4th shift)
(a) honey (b) ice cream (c) oils (d) spices
Sol.307.(b) Ice cream . Adulteration - A
practice of secretly mixing a substance
with another. Other Food Products and
Adulterants: Honey - corn syrups, syrups
of natural origin such as maple, cane
sugar, beet sugar, and molasses. Sugar -
Chalk powder, washing soda, urea. Edible
Oils - Mineral oil, Karanja oil, castor oil.
Q.308. Which organic compound has a
pleasant almond aroma that is
commonly used to impart almond ?avour
to chocolate and baked goods?
SSC CGL 21/07/2023 (2nd shift)
(a) Manzanate (b) Benzaldehydes
(c) Ethyl maltol (d) Isoamyl acetate
Sol.308.(b) Benzaldehydes (C
7
H
6
O) . It is
found in several essential oils : hyacinth,
citronella, orris, cinnamon, sassafras,
labdanum, and patchouli.
Q.309. Which of the following
sedimentary minerals, known to everyone
as 'salt', usually forms in arid climates
where sea water evaporates?
SSC CGL 24/07/2023 (1st shift)
(a) Zeolite (b) Halite (c) Calcite (d) Pyrite
Sol.309.(b) Halite. It is commonly known
as rock salt, a type of salt, the mineral
form of sodium chloride. Halite forms
isometric crystals.
Q.310. The characteristic garlicky odour
of garlic is due to __________.
SSC CGL 27/07/2023 (1st shift)
(a) iodine (b) copper
(c) chlorine (d) sulphur
Sol.310.(d) Sulphur. Onions, leeks and
chives also contain Sulphur. Seafoods
are rich in iodine. When garlic is crushed,
chopped, or otherwise damaged,
enzymes in the garlic cells react with
sulphur-containing compounds called
allicin and an enzyme called alliinase.
Allicin, in particular, is responsible for the
pungent smell of garlic.
Q.311. Which of the following food items
can be used as natural food
preservatives?
Higher Secondary 28/06/2023 ( Shift - 2)
(a) Vinegar, ginger, apple and banana
(b) Garlic, lemon, sugar and vinegar
(c) Garlic, apple, salt and tamarind
(d) Ginger, garlic, banana and tamarind
Sol.311.(b) Garlic, lemon, sugar and
vinegar. Food preservatives - Prevent
food spoilage caused by microbial
growth and increase the shelf life of
foods. Some other food items that can
be used as natural food preservatives: Oil
and Spices. Examples of food
preservatives - sodium benzoate, sorbic
acid and propanoic acid salts, sulphur
dioxide, sul?tes, potassium nitrate,
erythorbic acid, calcium sorbate, nitrites
and nitrates.
Q.312. Which compound is used to
remove the skins from tomatoes,
potatoes and other fruits and vegetables
for canning and as an ingredient in food
preservatives that helps prevent mould
and bacteria from growing in food?
Matric Level 27/06/2023 (Shift - 2)
(a) Sodium hydroxide
(b) Magnesium bisulphite
(c) Aluminium phosphide
(d) Sodium bicarbonate
Sol.312.(a) Sodium hydroxide (NaOH) - It
is a strong base and also known as
caustic soda or lye. Magnesium
bisulphite Mg(HSO
3
)
2
is commonly used
in the food industry as a preservative and
antioxidant to prevent spoilage and
discoloration in food products.
Aluminium phosphide (AlP) is used as a
fumigant (It reacts with water or acids to
release phosphine gas) to control pests.
Q.313. Which among the following
chemicals is used to purify water as a
disinfectant?
SSC MTS 04/05/2023 (Morning)
(a) Chlorine (b) Ethanol
(c) Phosphorus (d) Te?on
Sol.313.(a) Chlorine (Cl
2
) :- It is a yellow
-green gas at room temperature. Ethanol
(C
2
H
6
O) - It is an organic compound. It is
used as a solvent, in the manufacture of
other organic compounds, and as an
additive to automobile fuel. Phosphorus
- It is used in fertilizers for agriculture
and farm production. Te?on - The
scienti?c name is polytetra?uoroethylene
(PTFE). It is used in making waterproof
fabric, non-stick cookware, anti-friction
devices, etc.
Q.314. Which among the following gases
is used as an anaesthetic in dental
surgery.
SSC MTS 04/05/2023 (Afternoon)
(a) Nitrous Oxide (b) Radon
(c) Argon (d) Helium
Sol.314.(a) Nitrous Oxide (N
2
O). Radon
(Rn, Atomic Number - 86) - An odourless,
invisible, radioactive gas used in Cancer
therapy. Argon (Ar, Atomic Number - 18) -
Third-most abundant gas in Earth's
atmosphere used in Electrical Light
Bulbs. Helium (He, Atomic Number - 2) -
Helium-oxygen (heliox) mixtures are used
as a breathing medium during deep
dives.
Q.315. What is another name for frozen
carbon dioxide?
SSC MTS 12/05/2023 (Evening)
(a) Refrigerant (b) Coal
(c) Dry Ice (d) Coke
Sol.315.(c) Dry Ice. Frozen Carbon
Dioxide does not melt into a liquid, but
instead changes directly into Gas
(Sublimation). The temperature of dry ice
is around -109.3 Degree Fahrenheit (-78
o
Celsius). It is popularly used for shipping
certain foods and medicines. It is used
as a cooling agent, fog machines at
theatres for dramatic effects.
Q.316. Which among the following gases
is used in the arti?cial ripening of fruits?
SSC MTS 16/06/2023 (Morning)
(a) Argon (b) Freon
(c) Helium (d) Acetylene
Sol.316.(d) Acetylene . Other use:
welding, cutting , producing rubber, ?ame
gouging, creating polymers and resins,
production of dyes and pigments.
Q.317. What is the colour of the outer
zone of complete combustion of a
candle ?ame?
SSC CHSL 10/03/2023 (1st Shift)
(a) Blue (b) Yellow (c) Black (d) Orange
Sol.317.(a) Blue. It is the outer zone or
the non-luminous zone in candle ?ame,
other zones are the Innermost zone or
the luminous zone ( Black colour ), Middle
zone ( Yellow colour ). The burning of a
candle is both a physical and a chemical
change. The burning of the candle is an
exothermic reaction.
Q.318. Anant's mother advised him to
not sleep under the trees at night as
trees release _______ at night.
SSC CHSL 10/03/2023 (4th Shift)
(a) Methane (b) Carbon Dioxide
(c) Nitrogen (d) Oxygen
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Sol.286.(d) Steam distillation is
aseparation process that consists of
distilling water together with other
volatile and non-volatile components.
The coarse substance feels rough and
hard, used by gymnasts as it increases
the friction between the bar and the
gymnast's hands.
Q.287. Which of the following techniques
can be used for reducing the total
dissolved solids (TDS) in water?
(1) Ion Exchange
(2) Distillation
(3) Carding
SSC CGL 19/04/2022 (Afternoon)
(a) Only 1 (b) Only 3
(c) Both 1 and 2 (d) Both 2 and 3
Sol.287.(c) Both 1 and 2 . The TDS (Total
Dissolved Solids) level between 50-150 is
considered as the most suitable and
acceptable.
Q.288. Which among the following is
NOT true about a solution and the solute
concerned?
SSC CPO 24/11/2020 (Morning)
(a) The particles of the solute do not
scatter a beam of light
(b) The particles of the solute settle
down at the bottom when the solution
is kept undisturbed.
(c) The particles of the solute cannot be
seen with unaided eyes.
(d) A solution is a homogeneous mixture
Sol.288.(b) Only the particles of a Solute
in a Heterogeneous solution settle down
at the bottom when the solution is left
undisturbed. In a homogenous solution
the solute gets dissolved completely in
the solvent. For example salt or sugar in
water gets completely dissolved.
Q.289. Solubility of gases in liquids _____
with decrease in temperature.
SSC CPO 25/11/2020 (Evening)
(a) Remains constant
(b) First decreases and then increases
(c) Increases
(d) decreases
Sol.289.(c) Increases. Solubility of
gases in liquids increases with decrease
in temperature and it decreases with the
increase in temperature. Adding heat to
the solution provides thermal energy that
overcomes the attractive forces between
the gas and the solvent molecules.
Q.290. ____ Law of independent
migration of ions states that limiting
molar conductivity of an electrolyte can
be represented as the sum of the
individual contributions of the anion and
cation of the electrolyte.
SSC CPO 25/11/2020 (Evening)
(a) Dirac (b) Feynman
(c) Schrodinger (d) Kohlrausch
Sol.290.(d) Kohlrausch Law is
dependent on the nature of the solvent
and on the potential gradient but not on
the other ions present. Kohlrausch Law
helps in determination of limiting molar
conductivities for any electrolyte. Weak
electrolytes have lower molar
conductivities and lower degree of
dissociation at higher concentrations.
Chemistry in Everyday life
Q.291. Match List-I with List-II.
List-I
(Chemical compound)
List-II
(Spices)
A. Curcuminoids 1. Cardamom
B. 1, 8-cineole 2. Black pepper
C. Eugenol 3. Turmeric
D. Piperine 4. Cloves
SSC CGL Tier II 26/10/2023
(a) A - 4, B - 3, C - 2, D - 1
(b) A - 3, B - 1, C - 4, D - 2
(c) A - 3, B - 1, C - 2, D - 4
(d) A - 1, B - 4, C - 3, D - 2
Sol.291.(b) A - 3, B - 1, C - 4, D - 2.
Chemical Constituents of spices :
Coriander - Linalool, borneol, terpineol,
cumene. Saffron - Crocins, safranal,
salicylic, vanillic acid. Mustard seeds -
Allyl isothiocyanate. Garlic - Allicin.
Ginger - Gingerol. Cumin - Cumin
aldehyde.
Q.292. Out of the following, identify the
process that does NOT involve a
chemical reaction.
SSC Stenographer 12/10/2023 (Afternoon)
(a) Cloth cleaning using detergent
(b) Ripening of mango
(c) Change of colour of turmeric due to
soap
(d) Cooling effect of nail polish remover
Sol.292.(d) Cooling effect of nail polish
remover . Chemical reactions : It is a
reaction in which the bonds are broken
within reactant molecules, and new
bonds are formed within product
molecules in order to form a new
substance. Examples - Cooking food,
Cleaning clothes, Burning fuel, Rusting of
iron, Photosynthesis in plants, Digestion,
Combustion, Boiling an egg, Ripening of
fruits.
Q.293. Which chemical compound is
present in hard plastic such as drinking
water bottles and many household
items?
SSC Stenographer 13/10/2023 (Morning)
(a) Bisphenol A (b) Tri?uralin
(c) Chrome alum (d) Heptachlor
Sol.293.(a) Bisphenol A (BPA). Other
uses - Used in beverage containers,
compact disks, plastic dinnerware,
impact -resistant safety equipment,
automobile parts, and toys. BPA is toxic
for humans and animals. Uses of some
compounds : Tri?uralin - Used as
herbicide. Chrome alum - In the tanning
of leather. Heptachlor - As a soil and
seed treatment and for termite control.
Q.294. Which of the following is
considered a chemical hazard in food?
SSC Stenographer 13/10/2023 (Afternoon)
(a) Stones (b) sand
(c) Jewellery (d) Pesticides residues
Sol.294.(d) Pesticides residues.
Pesticides are one of the major inputs
used for increasing agricultural
productivity of crops. The pesticide
residues, left to variable extent in the
food materials after harvesting, are
beyond the control of consumers and
have deleterious effects on human
health. Pesticides are chemical
compounds that are used to kill pests,
including insects, rodents, fungi and
unwanted plants (weeds). Examples of
synthetic chemical pesticides are DDT,
Heptachlor, Chlordane.
Q.295. Which of the following is NOT a
food preservative?
SSC CPO 03/10/2023 (Evening)
(a) Aqua regia (b) Sodium nitrite
(c) Vinegar (d) Sodium chloride
Sol.295.(a) Aqua Regia. It is used for
puri?cation purposes of gold and
platinum. It is a mixture of nitric acid
(HNO
3
) and hydrochloric acid (HCl) in the
ratio of 1:3. Sodium Nitrate (Chile
Saltpetre) - NaNO
3
. Vinegar (Acetic acid)
- CH
3
COOH. Sodium Chloride (Salt) -
NaCl.
Q.296. Which gas is the major
component of biogas?
SSC CHSL 02/08/2023 (4th shift)
(a) CNG (b) Methane
(c) Hydrogen (d) LPG
Sol.296.(b) Methane (CH
4
). It has a high
heat of combustion (CH
4
+ 2O
2
? CO
2
+
2H
2
O + heat). It is used as fuel. Biogas is
formed by the decomposition of organic
matter with the action of bacteria in the
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absence of oxygen. The major
components of biogas - Methane
(50-75%), Carbon dioxide (25-50%),
Nitrogen (2-8%). Compressed Natural
Gas (CNG) consists of about 80-90%
methane. Liqui?ed Petroleum Gas (LPG)
consists of a compressed mixture of
propane and butane in liquid form.
Hydrogen is a clean fuel that, when
consumed in a fuel cell, produces only
water.
Q.297. Hardness of water is expressed in
terms of:
SSC CHSL 04/08/2023 (1st shift)
(a) mole (b) molarity
(c) ppm (d) normality
Sol.297.(c) ppm (parts per million) -
Ratio between the number of parts of
solids/solute to a million parts of total
volume. Water hardness is the amount of
dissolved calcium and magnesium in the
water. Mole (SI unit of amount of
substance) - Amount of a chemical
substance that contains as many
elementary entities (atoms, molecules,
ions, electrons). Molarity is a unit of
concentration expressed as the number
of moles of dissolved solute per litre of
solution. Normality - The number of gram
equivalents weights of a solute present
in one litre of a solvent.
Q.298. What kind of smell do Esters
have?
SSC CHSL 04/08/2023 (4th shift)
(a) Sweet smell like fruits
(b) Rotten egg smell
(c) Floral smell
(d) Pungent smell
Sol.298.(a) Sweet smells like fruits. The
group of chemical compounds which are
formed by bonding an alcohol group with
a group of organic acids by losing water
molecules is called Esters . Other
chemical compounds and its Smell:
Terpenes - Floral, Rose, Lemon; Amines -
Fishy, Rotting meat; Aldehydes - Grassy,
Floral; Chlorine gas - Pungent, Irritating
odour.
Q.299. When milk is converted into curd,
which type of change is it?
SSC CHSL 09/08/2023 (4th shift)
(a) Reversible change
(b) Physical change
(c) Isothermal change
(d) Chemical change
Sol.299.(d) Chemical change - A change
in which one or more new substances
are formed. Curd is formed through the
fermentation of milk by lactic acid
bacteria, primarily Lactobacillus, which
convert lactose into lactic acid, causing
the milk proteins to denature and
coagulate.
Q.300. Which of the following is the
product as a result of the process of
hydrolysis of orthoclase.
SSC CHSL 10/08/2023 (4th shift)
(a) Limonite (b) Magnesite
(c) Gypsum (d) Kaolinite
Sol.300.(d) Kaolinite (Al
2
Si
2
O
5
(OH)
4
) : A
clay mineral It's commonly found in soils
and sedimentary rocks. Used in - Rubber,
paint, paper making, and as a ?ller in
some products. Orthoclase (KAlSi
3
O
8
): A
common type of feldspar mineral (a
group of rock-forming minerals).
Magnesite (MgCO
3
). Gypsum
(CaSO
4
·2H
2
O): It is added to cement to
slow down the rate of setting.
Q.301. When camphor is heated, which
of the following changes will take place?
SSC CHSL 11/08/2023 (3rd shift)
(a) Solid to gas
(b) Solid to liquid to gas
(c) Liquid to gas
(d) Solid to liquid
Sol.301.(a) Solid to gas. If camphor
vapours are cooled, they change back to
the solid crystalline state.
Q.302. Which of the following metal salts
is responsible for permanent hardness in
water?
SSC CHSL 14/08/2023 (4th shift)
(a) KCI (b) NaCl (c) Ca(HCO
3
)
2
(d) CaCl
2
Sol.302.(d) CaCl
2
(Calcium chloride).
Hardness of water is due to the presence
of soluble bicarbonates, chlorides and
sulphates of calcium and magnesium.
Types of Hardness: Temporary (presence
of magnesium and calcium
bicarbonates) and Permanent (presence
of soluble salts of magnesium and
calcium). KCl - Potassium chloride, NaCl -
Sodium chloride (Common Salt).
Ca(HCO
3
)
2
- Calcium bicarbonate or
Calcium hydrogencarbonate.
Q.303. What is the product of the
reaction when anhydrite undergoes
hydration?
SSC CHSL 03/08/2023 (1st shift)
(a) Limonite (b) Magnesite
(c) Kaolin (d) Gypsum
Sol.303.(d) Gypsum (CaSO
4
.2H
2
O) :
Calcium sulphate (CaSO
4
) and water
(H
2
O) make up gypsum. Limonite forms
through the weathering of iron-bearing
minerals such as pyrite, magnetite, and
hematite under conditions of low
temperature and low oxygen. Uses -
Pigment, Cement, Soil conditioner, Water
treatment, Scienti?c research. Magnesite
is formed when magnesium-rich rocks
are altered by metamorphism or
chemical weathering. Used as a binding
agent in ?ooring. Kaolin is a rock from
which the clay mineral kaolinite is
derived. Used as the principal ingredient
in porcelain tableware.
Q.304. Which mineral salt is dissolved in
major amount in ocean water?
SSC CHSL 03/08/2023 (2nd shift)
(a) Calcium chloride
(b) Calcium carbonate
(c) Sodium chloride
(d) Calcium sulphate
Sol.304.(c) Sodium chloride (NaCl). It is
also known as table salt. Commonly
used as a condiment and food
preservative. Some of the minerals that
are found in the ocean water - Chloride,
Sodium, Magnesium, Sulphur, Calcium,
Bromine, etc. About 97% of the Earth’s
surface is found in Ocean.
Q.305. Which of the following chemicals
is used as a preservative to slow
browning and discolouration in foods
and beverages during preparation,
storage and distribution ?
SSC CGL 17/07/2023 (2nd shift)
(a) Nitrous oxide (b) Phosgene
(c) Sulphites (d) Chlorine
Sol.305.(c) Sulphites. Other Food
preservatives : Benzoic acid, Sodium
benzoate, nitrites, sodium sorbate and
potassium sorbate. Nitrous oxide (N
2
O) -
Laughing gas. Uses - Anaesthetic,
Semiconductor manufacturing industry,
Rocket motors as an oxidiser. Phosgene
(COCl
2
) also called Carbonyl chloride.
Uses - Dyestuffs, isocyanates, pesticides
and pharmaceuticals. Chlorine (Cl
2
) is
used in water treatment, bleaching and
disinfectants.
Q.306. Which sodium compound is the
most popular additive to various items
such as sauces, salad dressings and
beverages for its preservative action?
SSC CGL 17/07/2023 (3rd shift)
(a) Sodium bicarbonate
(b) Sodium ?uoride
(c) Sodium hypochlorite
(d) Sodium benzoate
Sol.306.(d) Sodium benzoate
(C
6
H
5
COONa). Also known as benzoate
of soda, a white crystalline chemical
used in foods, such as soda, lemon juice,
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pickles, jelly, salad dressing, soy sauce.
Sodium bicarbonate (NaHCO3), also
known as baking soda used in cooking,
disinfectant, pest control, teeth hygiene,
indigestion. Sodium ?uoride (NaF) a
colourless or white solid that is readily
soluble in water. It is soluble in water.
Sodium hypochlorite (NaClO) : An
inorganic chemical compound used as a
disinfecting agent.
Q.307. Pepperonil, ethyl acetate,
butyraldehyde and nitrate are some
common adulterants used in:
SSC CGL 19/07/2023 (4th shift)
(a) honey (b) ice cream (c) oils (d) spices
Sol.307.(b) Ice cream . Adulteration - A
practice of secretly mixing a substance
with another. Other Food Products and
Adulterants: Honey - corn syrups, syrups
of natural origin such as maple, cane
sugar, beet sugar, and molasses. Sugar -
Chalk powder, washing soda, urea. Edible
Oils - Mineral oil, Karanja oil, castor oil.
Q.308. Which organic compound has a
pleasant almond aroma that is
commonly used to impart almond ?avour
to chocolate and baked goods?
SSC CGL 21/07/2023 (2nd shift)
(a) Manzanate (b) Benzaldehydes
(c) Ethyl maltol (d) Isoamyl acetate
Sol.308.(b) Benzaldehydes (C
7
H
6
O) . It is
found in several essential oils : hyacinth,
citronella, orris, cinnamon, sassafras,
labdanum, and patchouli.
Q.309. Which of the following
sedimentary minerals, known to everyone
as 'salt', usually forms in arid climates
where sea water evaporates?
SSC CGL 24/07/2023 (1st shift)
(a) Zeolite (b) Halite (c) Calcite (d) Pyrite
Sol.309.(b) Halite. It is commonly known
as rock salt, a type of salt, the mineral
form of sodium chloride. Halite forms
isometric crystals.
Q.310. The characteristic garlicky odour
of garlic is due to __________.
SSC CGL 27/07/2023 (1st shift)
(a) iodine (b) copper
(c) chlorine (d) sulphur
Sol.310.(d) Sulphur. Onions, leeks and
chives also contain Sulphur. Seafoods
are rich in iodine. When garlic is crushed,
chopped, or otherwise damaged,
enzymes in the garlic cells react with
sulphur-containing compounds called
allicin and an enzyme called alliinase.
Allicin, in particular, is responsible for the
pungent smell of garlic.
Q.311. Which of the following food items
can be used as natural food
preservatives?
Higher Secondary 28/06/2023 ( Shift - 2)
(a) Vinegar, ginger, apple and banana
(b) Garlic, lemon, sugar and vinegar
(c) Garlic, apple, salt and tamarind
(d) Ginger, garlic, banana and tamarind
Sol.311.(b) Garlic, lemon, sugar and
vinegar. Food preservatives - Prevent
food spoilage caused by microbial
growth and increase the shelf life of
foods. Some other food items that can
be used as natural food preservatives: Oil
and Spices. Examples of food
preservatives - sodium benzoate, sorbic
acid and propanoic acid salts, sulphur
dioxide, sul?tes, potassium nitrate,
erythorbic acid, calcium sorbate, nitrites
and nitrates.
Q.312. Which compound is used to
remove the skins from tomatoes,
potatoes and other fruits and vegetables
for canning and as an ingredient in food
preservatives that helps prevent mould
and bacteria from growing in food?
Matric Level 27/06/2023 (Shift - 2)
(a) Sodium hydroxide
(b) Magnesium bisulphite
(c) Aluminium phosphide
(d) Sodium bicarbonate
Sol.312.(a) Sodium hydroxide (NaOH) - It
is a strong base and also known as
caustic soda or lye. Magnesium
bisulphite Mg(HSO
3
)
2
is commonly used
in the food industry as a preservative and
antioxidant to prevent spoilage and
discoloration in food products.
Aluminium phosphide (AlP) is used as a
fumigant (It reacts with water or acids to
release phosphine gas) to control pests.
Q.313. Which among the following
chemicals is used to purify water as a
disinfectant?
SSC MTS 04/05/2023 (Morning)
(a) Chlorine (b) Ethanol
(c) Phosphorus (d) Te?on
Sol.313.(a) Chlorine (Cl
2
) :- It is a yellow
-green gas at room temperature. Ethanol
(C
2
H
6
O) - It is an organic compound. It is
used as a solvent, in the manufacture of
other organic compounds, and as an
additive to automobile fuel. Phosphorus
- It is used in fertilizers for agriculture
and farm production. Te?on - The
scienti?c name is polytetra?uoroethylene
(PTFE). It is used in making waterproof
fabric, non-stick cookware, anti-friction
devices, etc.
Q.314. Which among the following gases
is used as an anaesthetic in dental
surgery.
SSC MTS 04/05/2023 (Afternoon)
(a) Nitrous Oxide (b) Radon
(c) Argon (d) Helium
Sol.314.(a) Nitrous Oxide (N
2
O). Radon
(Rn, Atomic Number - 86) - An odourless,
invisible, radioactive gas used in Cancer
therapy. Argon (Ar, Atomic Number - 18) -
Third-most abundant gas in Earth's
atmosphere used in Electrical Light
Bulbs. Helium (He, Atomic Number - 2) -
Helium-oxygen (heliox) mixtures are used
as a breathing medium during deep
dives.
Q.315. What is another name for frozen
carbon dioxide?
SSC MTS 12/05/2023 (Evening)
(a) Refrigerant (b) Coal
(c) Dry Ice (d) Coke
Sol.315.(c) Dry Ice. Frozen Carbon
Dioxide does not melt into a liquid, but
instead changes directly into Gas
(Sublimation). The temperature of dry ice
is around -109.3 Degree Fahrenheit (-78
o
Celsius). It is popularly used for shipping
certain foods and medicines. It is used
as a cooling agent, fog machines at
theatres for dramatic effects.
Q.316. Which among the following gases
is used in the arti?cial ripening of fruits?
SSC MTS 16/06/2023 (Morning)
(a) Argon (b) Freon
(c) Helium (d) Acetylene
Sol.316.(d) Acetylene . Other use:
welding, cutting , producing rubber, ?ame
gouging, creating polymers and resins,
production of dyes and pigments.
Q.317. What is the colour of the outer
zone of complete combustion of a
candle ?ame?
SSC CHSL 10/03/2023 (1st Shift)
(a) Blue (b) Yellow (c) Black (d) Orange
Sol.317.(a) Blue. It is the outer zone or
the non-luminous zone in candle ?ame,
other zones are the Innermost zone or
the luminous zone ( Black colour ), Middle
zone ( Yellow colour ). The burning of a
candle is both a physical and a chemical
change. The burning of the candle is an
exothermic reaction.
Q.318. Anant's mother advised him to
not sleep under the trees at night as
trees release _______ at night.
SSC CHSL 10/03/2023 (4th Shift)
(a) Methane (b) Carbon Dioxide
(c) Nitrogen (d) Oxygen
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Sol.318.(b) Carbon Dioxide (CO
2
) . During
the day plants take in carbon dioxide
(CO
2
) and release oxygen through
photosynthesis and at night carbon
dioxide (CO
2
) is released through
respiration. Exception : Snake plant,
Areca palm plant, Aloe Vera plant, Tulsi,
Neem plant, Peepal Tree, etc.
Q.319. What is the pH of normal milk?
SSC CHSL 13/03/2023 (3rd Shift)
(a) 9.1 - 9.3 (b) 8.1 - 8.3
(c) 5.4 - 5.6 (d) 6.7 - 6.9
Sol.319.(d) 6.7 - 6.9, pH - potential of
hydrogen. pH value of Gastric juice (1.0),
Soft Drink (2.0 - 4.0), Lemon Juice (2.2 -
2.4), Vinegar (2.4), Wine (2.8), Lime (2.8),
Apple juice (2.9 - 3.3), Soda water (3 - 4),
Orange juice (3.7), Butter (5), Curd (4.5 -
5.5), Beer (4.5), Urine (4.5 - 8), coffee
(5.0), Cheese (5.1 - 5.9), Tea (5.5), Saliva
(6.2 - 7.6), Blood plasma (7.35 - 7.45),
Alcohol (7.33), Oxygen (7.4), Baking Soda
(9), Bleaching powder (11) etc.
Q.320. Silicon dioxide is found mostly in
which of the following?
SSC CHSL 13/03/2023 (3rd Shift)
(a) Sand (b) Sugar (c) Salt (d) Slaked lime
Sol.320.(a) Sand. Slaked lime or calcium
hydroxide, Ca(OH)
2
: Soluble in glycerol,
high melting point (580° C), used in the
paper industry, Pesticides. Silicon
Dioxide or Silica, (SiO
2
) : Major
constituent of Sand, used in food
additives.
Q.321. Malic Acid is found in which of
the following substances?
SSC CHSL 13/03/2023 (4th Shift)
(a) Apple (b) Vinegar
(c) Ant's sting (d) Tamarind
Sol.321.(a) Apple. Other sources of
malic acid - Bananas, pomegranates,
grapes, berries, tomatoes, and broccoli.
Tartaric Acid - Grapes, tamarind, apples,
apricots, and bananas. Acid : A
hydrogen-containing substance that is
capable of donating a proton (hydrogen
ion) to another substance.
Q.322. An isotope of which of the
following is used in the treatment of
cancer?
SSC CHSL 17/03/2023 (3rd Shift)
(a) Cobalt (b) Aluminium
(c) Nickel (d) Iron
Sol.322.(a) Cobalt (Atomic number - 27).
Isotopes - Same atomic number but
different mass numbers. Example -
Isotopes of hydrogen - protium
1
H
1
,
deuterium
1
H
2
or and tritium
1
H
3
.
Isobars are atoms of different elements
with different atomic numbers but have
the same mass number. Example of a
pair of isobar i.e.,
40
Ca
20
and
40
Ar
18.
Q.323. In what form is the energy derived
from the food that we eat is stored in our
body?
SSC CGL 01/12/2022 (3rd Shift)
(a) Maltose (b) Glucose
(c) Glycogen (d) Starch
Sol.323.(c) Glycogen (polysaccharide of
glucose ; C
24
H
42
O
21
). Maltose (C
12
H
22
O
11
)
is a disaccharide consisting of two units
of glucose. Glucose (C
6
H
12
O
6
) is a simple
sugar monosaccharide having two
isoforms, alpha and beta. Starch
{(C
6
H
10
O
5
)n} is a polysaccharide
produced by most green plants for
energy storage.
Q.324. Which of the following are food
preservatives?
SSC CGL 07/12/2022 (3rd Shift)
(a) Salt, sodium nitrite, spices and
vinegar
(b) Gypsum, soda and methyl alcohol
(c) Gypsum, salt and formic acid
(d) Formic acid, vinegar and methyl
alcohol
Sol.324.(a) Sugar, salt (NaCl), sodium
nitrite (NaNO
2
), butylated hydroxy anisole
(C
11
H
16
O
2
), butylated hydroxytoluene
(C
15
H
24
O), tert-butylhydroquinone
(C
10
H
14
O
2
), vinegar (CH3COOH), citric acid
(C6H8O7), spices, and calcium propionate
(C
6
H
10
CaO
4
) are all chemicals that
preserve foods.
Q.325. Which is the most popular coal in
commercial use?
SSC CGL 07/12/2022 (1st Shift)
(a) Bituminous (b) Anthracite
(c) Peat (d) Lignite
Sol.325.(a) Bituminous coal (Dark
brown, 45–86%). This coal is reviewed
based on versatility, dampness
substance, instability and cinder content.
Other types of coal: Peat ( precursor of
coal, 40% carbon), Lignite (25–35%,
brown coal), Anthracite (86–97%
carbon).
Q.326. Identify a dark-coloured
amorphous substance that is highly
resistant to microbial action and
undergoes decomposition at an
extremely slow rate.
SSC CGL 06/12/2022 (2nd Shift)
(a) Chitin (b) Humus
(c) Carotenoids (d) Colloids
Sol.326.(b) Humus. Chitin is the most
abundant amino polysaccharide polymer
occurring in nature. Chitin exists in the
shells of arthropods such as crabs,
shrimps, and insects. Carotenoids are
pigments that give yellow, orange, and
red fruits and vegetables their color. Our
body is able to convert some carotenoids
into vitamin A.
Q.327. Which of the following
greenhouse gases is most abundant in
the atmosphere?
SSC CGL 05/12/2022 (4th Shift)
(a) Nitrous Oxide (b) Water Vapour
(c) Methane (d) Carbon Oxide
Sol.327.(b) Water vapour. Greenhouse
gases: carbon dioxide (CO
2
) 65% ,
methane (CH
4
)16%, nitrous oxide (N
2
O),
6% ?uorinated gases
{(hydrochloro?uorocarbons (HCFCs),
per?uorocarbons (PFCs) and Sulphur
Hexa?uoride (SF
6
)} 2% and ozone (O
3
).
Q.328. Which of the following is used in
photography?
SSC CGL 05/12/2022 (1st Shift)
(a) Sodium bicarbonate
(b) Sodium thiosulphate
(c) Sodium hydroxide
(d) Sodium sulphate
Sol.328.(b) Sodium thiosulphate
(Na2S2O3) is used in photography to
remove undecomposed AgBr as soluble
silver thiosulphate complex. Antidote
agent against cyanide poisoning.
Dechlorination of small water bodies like
ponds, aquariums, etc. It is on the World
Health Organization's List of Essential
Medicines. Sodium sulphate (Na
2
SO
4
) -
detergents, paper pulping, cattle feed.
Q.329. ______ is found in association
with rocks composed of calcium
carbonates?
SSC CGL 03/12/2022 (1st Shift)
(a) Limestone (b) Gold
(c) Iron (d) Diamond
Sol.329.(a) Limestone is a sedimentary
rock made of calcium carbonate
(CaCO
3
), usually in the form of calcite or
aragonite. Some other examples of
sedimentary include Breccia,
Conglomerate, Sandstone, Siltstone, and
Shale. These rocks are formed by the
deposition and subsequent cementation
of the material at the Earth’s surface
within the bodies of water.
Q.330. Carbon dating means:
SSC CPO 09/11/2022 (Morning)
(a) a method to determine the density of
?ssile material.
(b) a method of calculating the remains
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Sol.286.(d) Steam distillation is
aseparation process that consists of
distilling water together with other
volatile and non-volatile components.
The coarse substance feels rough and
hard, used by gymnasts as it increases
the friction between the bar and the
gymnast's hands.
Q.287. Which of the following techniques
can be used for reducing the total
dissolved solids (TDS) in water?
(1) Ion Exchange
(2) Distillation
(3) Carding
SSC CGL 19/04/2022 (Afternoon)
(a) Only 1 (b) Only 3
(c) Both 1 and 2 (d) Both 2 and 3
Sol.287.(c) Both 1 and 2 . The TDS (Total
Dissolved Solids) level between 50-150 is
considered as the most suitable and
acceptable.
Q.288. Which among the following is
NOT true about a solution and the solute
concerned?
SSC CPO 24/11/2020 (Morning)
(a) The particles of the solute do not
scatter a beam of light
(b) The particles of the solute settle
down at the bottom when the solution
is kept undisturbed.
(c) The particles of the solute cannot be
seen with unaided eyes.
(d) A solution is a homogeneous mixture
Sol.288.(b) Only the particles of a Solute
in a Heterogeneous solution settle down
at the bottom when the solution is left
undisturbed. In a homogenous solution
the solute gets dissolved completely in
the solvent. For example salt or sugar in
water gets completely dissolved.
Q.289. Solubility of gases in liquids _____
with decrease in temperature.
SSC CPO 25/11/2020 (Evening)
(a) Remains constant
(b) First decreases and then increases
(c) Increases
(d) decreases
Sol.289.(c) Increases. Solubility of
gases in liquids increases with decrease
in temperature and it decreases with the
increase in temperature. Adding heat to
the solution provides thermal energy that
overcomes the attractive forces between
the gas and the solvent molecules.
Q.290. ____ Law of independent
migration of ions states that limiting
molar conductivity of an electrolyte can
be represented as the sum of the
individual contributions of the anion and
cation of the electrolyte.
SSC CPO 25/11/2020 (Evening)
(a) Dirac (b) Feynman
(c) Schrodinger (d) Kohlrausch
Sol.290.(d) Kohlrausch Law is
dependent on the nature of the solvent
and on the potential gradient but not on
the other ions present. Kohlrausch Law
helps in determination of limiting molar
conductivities for any electrolyte. Weak
electrolytes have lower molar
conductivities and lower degree of
dissociation at higher concentrations.
Chemistry in Everyday life
Q.291. Match List-I with List-II.
List-I
(Chemical compound)
List-II
(Spices)
A. Curcuminoids 1. Cardamom
B. 1, 8-cineole 2. Black pepper
C. Eugenol 3. Turmeric
D. Piperine 4. Cloves
SSC CGL Tier II 26/10/2023
(a) A - 4, B - 3, C - 2, D - 1
(b) A - 3, B - 1, C - 4, D - 2
(c) A - 3, B - 1, C - 2, D - 4
(d) A - 1, B - 4, C - 3, D - 2
Sol.291.(b) A - 3, B - 1, C - 4, D - 2.
Chemical Constituents of spices :
Coriander - Linalool, borneol, terpineol,
cumene. Saffron - Crocins, safranal,
salicylic, vanillic acid. Mustard seeds -
Allyl isothiocyanate. Garlic - Allicin.
Ginger - Gingerol. Cumin - Cumin
aldehyde.
Q.292. Out of the following, identify the
process that does NOT involve a
chemical reaction.
SSC Stenographer 12/10/2023 (Afternoon)
(a) Cloth cleaning using detergent
(b) Ripening of mango
(c) Change of colour of turmeric due to
soap
(d) Cooling effect of nail polish remover
Sol.292.(d) Cooling effect of nail polish
remover . Chemical reactions : It is a
reaction in which the bonds are broken
within reactant molecules, and new
bonds are formed within product
molecules in order to form a new
substance. Examples - Cooking food,
Cleaning clothes, Burning fuel, Rusting of
iron, Photosynthesis in plants, Digestion,
Combustion, Boiling an egg, Ripening of
fruits.
Q.293. Which chemical compound is
present in hard plastic such as drinking
water bottles and many household
items?
SSC Stenographer 13/10/2023 (Morning)
(a) Bisphenol A (b) Tri?uralin
(c) Chrome alum (d) Heptachlor
Sol.293.(a) Bisphenol A (BPA). Other
uses - Used in beverage containers,
compact disks, plastic dinnerware,
impact -resistant safety equipment,
automobile parts, and toys. BPA is toxic
for humans and animals. Uses of some
compounds : Tri?uralin - Used as
herbicide. Chrome alum - In the tanning
of leather. Heptachlor - As a soil and
seed treatment and for termite control.
Q.294. Which of the following is
considered a chemical hazard in food?
SSC Stenographer 13/10/2023 (Afternoon)
(a) Stones (b) sand
(c) Jewellery (d) Pesticides residues
Sol.294.(d) Pesticides residues.
Pesticides are one of the major inputs
used for increasing agricultural
productivity of crops. The pesticide
residues, left to variable extent in the
food materials after harvesting, are
beyond the control of consumers and
have deleterious effects on human
health. Pesticides are chemical
compounds that are used to kill pests,
including insects, rodents, fungi and
unwanted plants (weeds). Examples of
synthetic chemical pesticides are DDT,
Heptachlor, Chlordane.
Q.295. Which of the following is NOT a
food preservative?
SSC CPO 03/10/2023 (Evening)
(a) Aqua regia (b) Sodium nitrite
(c) Vinegar (d) Sodium chloride
Sol.295.(a) Aqua Regia. It is used for
puri?cation purposes of gold and
platinum. It is a mixture of nitric acid
(HNO
3
) and hydrochloric acid (HCl) in the
ratio of 1:3. Sodium Nitrate (Chile
Saltpetre) - NaNO
3
. Vinegar (Acetic acid)
- CH
3
COOH. Sodium Chloride (Salt) -
NaCl.
Q.296. Which gas is the major
component of biogas?
SSC CHSL 02/08/2023 (4th shift)
(a) CNG (b) Methane
(c) Hydrogen (d) LPG
Sol.296.(b) Methane (CH
4
). It has a high
heat of combustion (CH
4
+ 2O
2
? CO
2
+
2H
2
O + heat). It is used as fuel. Biogas is
formed by the decomposition of organic
matter with the action of bacteria in the
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absence of oxygen. The major
components of biogas - Methane
(50-75%), Carbon dioxide (25-50%),
Nitrogen (2-8%). Compressed Natural
Gas (CNG) consists of about 80-90%
methane. Liqui?ed Petroleum Gas (LPG)
consists of a compressed mixture of
propane and butane in liquid form.
Hydrogen is a clean fuel that, when
consumed in a fuel cell, produces only
water.
Q.297. Hardness of water is expressed in
terms of:
SSC CHSL 04/08/2023 (1st shift)
(a) mole (b) molarity
(c) ppm (d) normality
Sol.297.(c) ppm (parts per million) -
Ratio between the number of parts of
solids/solute to a million parts of total
volume. Water hardness is the amount of
dissolved calcium and magnesium in the
water. Mole (SI unit of amount of
substance) - Amount of a chemical
substance that contains as many
elementary entities (atoms, molecules,
ions, electrons). Molarity is a unit of
concentration expressed as the number
of moles of dissolved solute per litre of
solution. Normality - The number of gram
equivalents weights of a solute present
in one litre of a solvent.
Q.298. What kind of smell do Esters
have?
SSC CHSL 04/08/2023 (4th shift)
(a) Sweet smell like fruits
(b) Rotten egg smell
(c) Floral smell
(d) Pungent smell
Sol.298.(a) Sweet smells like fruits. The
group of chemical compounds which are
formed by bonding an alcohol group with
a group of organic acids by losing water
molecules is called Esters . Other
chemical compounds and its Smell:
Terpenes - Floral, Rose, Lemon; Amines -
Fishy, Rotting meat; Aldehydes - Grassy,
Floral; Chlorine gas - Pungent, Irritating
odour.
Q.299. When milk is converted into curd,
which type of change is it?
SSC CHSL 09/08/2023 (4th shift)
(a) Reversible change
(b) Physical change
(c) Isothermal change
(d) Chemical change
Sol.299.(d) Chemical change - A change
in which one or more new substances
are formed. Curd is formed through the
fermentation of milk by lactic acid
bacteria, primarily Lactobacillus, which
convert lactose into lactic acid, causing
the milk proteins to denature and
coagulate.
Q.300. Which of the following is the
product as a result of the process of
hydrolysis of orthoclase.
SSC CHSL 10/08/2023 (4th shift)
(a) Limonite (b) Magnesite
(c) Gypsum (d) Kaolinite
Sol.300.(d) Kaolinite (Al
2
Si
2
O
5
(OH)
4
) : A
clay mineral It's commonly found in soils
and sedimentary rocks. Used in - Rubber,
paint, paper making, and as a ?ller in
some products. Orthoclase (KAlSi
3
O
8
): A
common type of feldspar mineral (a
group of rock-forming minerals).
Magnesite (MgCO
3
). Gypsum
(CaSO
4
·2H
2
O): It is added to cement to
slow down the rate of setting.
Q.301. When camphor is heated, which
of the following changes will take place?
SSC CHSL 11/08/2023 (3rd shift)
(a) Solid to gas
(b) Solid to liquid to gas
(c) Liquid to gas
(d) Solid to liquid
Sol.301.(a) Solid to gas. If camphor
vapours are cooled, they change back to
the solid crystalline state.
Q.302. Which of the following metal salts
is responsible for permanent hardness in
water?
SSC CHSL 14/08/2023 (4th shift)
(a) KCI (b) NaCl (c) Ca(HCO
3
)
2
(d) CaCl
2
Sol.302.(d) CaCl
2
(Calcium chloride).
Hardness of water is due to the presence
of soluble bicarbonates, chlorides and
sulphates of calcium and magnesium.
Types of Hardness: Temporary (presence
of magnesium and calcium
bicarbonates) and Permanent (presence
of soluble salts of magnesium and
calcium). KCl - Potassium chloride, NaCl -
Sodium chloride (Common Salt).
Ca(HCO
3
)
2
- Calcium bicarbonate or
Calcium hydrogencarbonate.
Q.303. What is the product of the
reaction when anhydrite undergoes
hydration?
SSC CHSL 03/08/2023 (1st shift)
(a) Limonite (b) Magnesite
(c) Kaolin (d) Gypsum
Sol.303.(d) Gypsum (CaSO
4
.2H
2
O) :
Calcium sulphate (CaSO
4
) and water
(H
2
O) make up gypsum. Limonite forms
through the weathering of iron-bearing
minerals such as pyrite, magnetite, and
hematite under conditions of low
temperature and low oxygen. Uses -
Pigment, Cement, Soil conditioner, Water
treatment, Scienti?c research. Magnesite
is formed when magnesium-rich rocks
are altered by metamorphism or
chemical weathering. Used as a binding
agent in ?ooring. Kaolin is a rock from
which the clay mineral kaolinite is
derived. Used as the principal ingredient
in porcelain tableware.
Q.304. Which mineral salt is dissolved in
major amount in ocean water?
SSC CHSL 03/08/2023 (2nd shift)
(a) Calcium chloride
(b) Calcium carbonate
(c) Sodium chloride
(d) Calcium sulphate
Sol.304.(c) Sodium chloride (NaCl). It is
also known as table salt. Commonly
used as a condiment and food
preservative. Some of the minerals that
are found in the ocean water - Chloride,
Sodium, Magnesium, Sulphur, Calcium,
Bromine, etc. About 97% of the Earth’s
surface is found in Ocean.
Q.305. Which of the following chemicals
is used as a preservative to slow
browning and discolouration in foods
and beverages during preparation,
storage and distribution ?
SSC CGL 17/07/2023 (2nd shift)
(a) Nitrous oxide (b) Phosgene
(c) Sulphites (d) Chlorine
Sol.305.(c) Sulphites. Other Food
preservatives : Benzoic acid, Sodium
benzoate, nitrites, sodium sorbate and
potassium sorbate. Nitrous oxide (N
2
O) -
Laughing gas. Uses - Anaesthetic,
Semiconductor manufacturing industry,
Rocket motors as an oxidiser. Phosgene
(COCl
2
) also called Carbonyl chloride.
Uses - Dyestuffs, isocyanates, pesticides
and pharmaceuticals. Chlorine (Cl
2
) is
used in water treatment, bleaching and
disinfectants.
Q.306. Which sodium compound is the
most popular additive to various items
such as sauces, salad dressings and
beverages for its preservative action?
SSC CGL 17/07/2023 (3rd shift)
(a) Sodium bicarbonate
(b) Sodium ?uoride
(c) Sodium hypochlorite
(d) Sodium benzoate
Sol.306.(d) Sodium benzoate
(C
6
H
5
COONa). Also known as benzoate
of soda, a white crystalline chemical
used in foods, such as soda, lemon juice,
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pickles, jelly, salad dressing, soy sauce.
Sodium bicarbonate (NaHCO3), also
known as baking soda used in cooking,
disinfectant, pest control, teeth hygiene,
indigestion. Sodium ?uoride (NaF) a
colourless or white solid that is readily
soluble in water. It is soluble in water.
Sodium hypochlorite (NaClO) : An
inorganic chemical compound used as a
disinfecting agent.
Q.307. Pepperonil, ethyl acetate,
butyraldehyde and nitrate are some
common adulterants used in:
SSC CGL 19/07/2023 (4th shift)
(a) honey (b) ice cream (c) oils (d) spices
Sol.307.(b) Ice cream . Adulteration - A
practice of secretly mixing a substance
with another. Other Food Products and
Adulterants: Honey - corn syrups, syrups
of natural origin such as maple, cane
sugar, beet sugar, and molasses. Sugar -
Chalk powder, washing soda, urea. Edible
Oils - Mineral oil, Karanja oil, castor oil.
Q.308. Which organic compound has a
pleasant almond aroma that is
commonly used to impart almond ?avour
to chocolate and baked goods?
SSC CGL 21/07/2023 (2nd shift)
(a) Manzanate (b) Benzaldehydes
(c) Ethyl maltol (d) Isoamyl acetate
Sol.308.(b) Benzaldehydes (C
7
H
6
O) . It is
found in several essential oils : hyacinth,
citronella, orris, cinnamon, sassafras,
labdanum, and patchouli.
Q.309. Which of the following
sedimentary minerals, known to everyone
as 'salt', usually forms in arid climates
where sea water evaporates?
SSC CGL 24/07/2023 (1st shift)
(a) Zeolite (b) Halite (c) Calcite (d) Pyrite
Sol.309.(b) Halite. It is commonly known
as rock salt, a type of salt, the mineral
form of sodium chloride. Halite forms
isometric crystals.
Q.310. The characteristic garlicky odour
of garlic is due to __________.
SSC CGL 27/07/2023 (1st shift)
(a) iodine (b) copper
(c) chlorine (d) sulphur
Sol.310.(d) Sulphur. Onions, leeks and
chives also contain Sulphur. Seafoods
are rich in iodine. When garlic is crushed,
chopped, or otherwise damaged,
enzymes in the garlic cells react with
sulphur-containing compounds called
allicin and an enzyme called alliinase.
Allicin, in particular, is responsible for the
pungent smell of garlic.
Q.311. Which of the following food items
can be used as natural food
preservatives?
Higher Secondary 28/06/2023 ( Shift - 2)
(a) Vinegar, ginger, apple and banana
(b) Garlic, lemon, sugar and vinegar
(c) Garlic, apple, salt and tamarind
(d) Ginger, garlic, banana and tamarind
Sol.311.(b) Garlic, lemon, sugar and
vinegar. Food preservatives - Prevent
food spoilage caused by microbial
growth and increase the shelf life of
foods. Some other food items that can
be used as natural food preservatives: Oil
and Spices. Examples of food
preservatives - sodium benzoate, sorbic
acid and propanoic acid salts, sulphur
dioxide, sul?tes, potassium nitrate,
erythorbic acid, calcium sorbate, nitrites
and nitrates.
Q.312. Which compound is used to
remove the skins from tomatoes,
potatoes and other fruits and vegetables
for canning and as an ingredient in food
preservatives that helps prevent mould
and bacteria from growing in food?
Matric Level 27/06/2023 (Shift - 2)
(a) Sodium hydroxide
(b) Magnesium bisulphite
(c) Aluminium phosphide
(d) Sodium bicarbonate
Sol.312.(a) Sodium hydroxide (NaOH) - It
is a strong base and also known as
caustic soda or lye. Magnesium
bisulphite Mg(HSO
3
)
2
is commonly used
in the food industry as a preservative and
antioxidant to prevent spoilage and
discoloration in food products.
Aluminium phosphide (AlP) is used as a
fumigant (It reacts with water or acids to
release phosphine gas) to control pests.
Q.313. Which among the following
chemicals is used to purify water as a
disinfectant?
SSC MTS 04/05/2023 (Morning)
(a) Chlorine (b) Ethanol
(c) Phosphorus (d) Te?on
Sol.313.(a) Chlorine (Cl
2
) :- It is a yellow
-green gas at room temperature. Ethanol
(C
2
H
6
O) - It is an organic compound. It is
used as a solvent, in the manufacture of
other organic compounds, and as an
additive to automobile fuel. Phosphorus
- It is used in fertilizers for agriculture
and farm production. Te?on - The
scienti?c name is polytetra?uoroethylene
(PTFE). It is used in making waterproof
fabric, non-stick cookware, anti-friction
devices, etc.
Q.314. Which among the following gases
is used as an anaesthetic in dental
surgery.
SSC MTS 04/05/2023 (Afternoon)
(a) Nitrous Oxide (b) Radon
(c) Argon (d) Helium
Sol.314.(a) Nitrous Oxide (N
2
O). Radon
(Rn, Atomic Number - 86) - An odourless,
invisible, radioactive gas used in Cancer
therapy. Argon (Ar, Atomic Number - 18) -
Third-most abundant gas in Earth's
atmosphere used in Electrical Light
Bulbs. Helium (He, Atomic Number - 2) -
Helium-oxygen (heliox) mixtures are used
as a breathing medium during deep
dives.
Q.315. What is another name for frozen
carbon dioxide?
SSC MTS 12/05/2023 (Evening)
(a) Refrigerant (b) Coal
(c) Dry Ice (d) Coke
Sol.315.(c) Dry Ice. Frozen Carbon
Dioxide does not melt into a liquid, but
instead changes directly into Gas
(Sublimation). The temperature of dry ice
is around -109.3 Degree Fahrenheit (-78
o
Celsius). It is popularly used for shipping
certain foods and medicines. It is used
as a cooling agent, fog machines at
theatres for dramatic effects.
Q.316. Which among the following gases
is used in the arti?cial ripening of fruits?
SSC MTS 16/06/2023 (Morning)
(a) Argon (b) Freon
(c) Helium (d) Acetylene
Sol.316.(d) Acetylene . Other use:
welding, cutting , producing rubber, ?ame
gouging, creating polymers and resins,
production of dyes and pigments.
Q.317. What is the colour of the outer
zone of complete combustion of a
candle ?ame?
SSC CHSL 10/03/2023 (1st Shift)
(a) Blue (b) Yellow (c) Black (d) Orange
Sol.317.(a) Blue. It is the outer zone or
the non-luminous zone in candle ?ame,
other zones are the Innermost zone or
the luminous zone ( Black colour ), Middle
zone ( Yellow colour ). The burning of a
candle is both a physical and a chemical
change. The burning of the candle is an
exothermic reaction.
Q.318. Anant's mother advised him to
not sleep under the trees at night as
trees release _______ at night.
SSC CHSL 10/03/2023 (4th Shift)
(a) Methane (b) Carbon Dioxide
(c) Nitrogen (d) Oxygen
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Sol.318.(b) Carbon Dioxide (CO
2
) . During
the day plants take in carbon dioxide
(CO
2
) and release oxygen through
photosynthesis and at night carbon
dioxide (CO
2
) is released through
respiration. Exception : Snake plant,
Areca palm plant, Aloe Vera plant, Tulsi,
Neem plant, Peepal Tree, etc.
Q.319. What is the pH of normal milk?
SSC CHSL 13/03/2023 (3rd Shift)
(a) 9.1 - 9.3 (b) 8.1 - 8.3
(c) 5.4 - 5.6 (d) 6.7 - 6.9
Sol.319.(d) 6.7 - 6.9, pH - potential of
hydrogen. pH value of Gastric juice (1.0),
Soft Drink (2.0 - 4.0), Lemon Juice (2.2 -
2.4), Vinegar (2.4), Wine (2.8), Lime (2.8),
Apple juice (2.9 - 3.3), Soda water (3 - 4),
Orange juice (3.7), Butter (5), Curd (4.5 -
5.5), Beer (4.5), Urine (4.5 - 8), coffee
(5.0), Cheese (5.1 - 5.9), Tea (5.5), Saliva
(6.2 - 7.6), Blood plasma (7.35 - 7.45),
Alcohol (7.33), Oxygen (7.4), Baking Soda
(9), Bleaching powder (11) etc.
Q.320. Silicon dioxide is found mostly in
which of the following?
SSC CHSL 13/03/2023 (3rd Shift)
(a) Sand (b) Sugar (c) Salt (d) Slaked lime
Sol.320.(a) Sand. Slaked lime or calcium
hydroxide, Ca(OH)
2
: Soluble in glycerol,
high melting point (580° C), used in the
paper industry, Pesticides. Silicon
Dioxide or Silica, (SiO
2
) : Major
constituent of Sand, used in food
additives.
Q.321. Malic Acid is found in which of
the following substances?
SSC CHSL 13/03/2023 (4th Shift)
(a) Apple (b) Vinegar
(c) Ant's sting (d) Tamarind
Sol.321.(a) Apple. Other sources of
malic acid - Bananas, pomegranates,
grapes, berries, tomatoes, and broccoli.
Tartaric Acid - Grapes, tamarind, apples,
apricots, and bananas. Acid : A
hydrogen-containing substance that is
capable of donating a proton (hydrogen
ion) to another substance.
Q.322. An isotope of which of the
following is used in the treatment of
cancer?
SSC CHSL 17/03/2023 (3rd Shift)
(a) Cobalt (b) Aluminium
(c) Nickel (d) Iron
Sol.322.(a) Cobalt (Atomic number - 27).
Isotopes - Same atomic number but
different mass numbers. Example -
Isotopes of hydrogen - protium
1
H
1
,
deuterium
1
H
2
or and tritium
1
H
3
.
Isobars are atoms of different elements
with different atomic numbers but have
the same mass number. Example of a
pair of isobar i.e.,
40
Ca
20
and
40
Ar
18.
Q.323. In what form is the energy derived
from the food that we eat is stored in our
body?
SSC CGL 01/12/2022 (3rd Shift)
(a) Maltose (b) Glucose
(c) Glycogen (d) Starch
Sol.323.(c) Glycogen (polysaccharide of
glucose ; C
24
H
42
O
21
). Maltose (C
12
H
22
O
11
)
is a disaccharide consisting of two units
of glucose. Glucose (C
6
H
12
O
6
) is a simple
sugar monosaccharide having two
isoforms, alpha and beta. Starch
{(C
6
H
10
O
5
)n} is a polysaccharide
produced by most green plants for
energy storage.
Q.324. Which of the following are food
preservatives?
SSC CGL 07/12/2022 (3rd Shift)
(a) Salt, sodium nitrite, spices and
vinegar
(b) Gypsum, soda and methyl alcohol
(c) Gypsum, salt and formic acid
(d) Formic acid, vinegar and methyl
alcohol
Sol.324.(a) Sugar, salt (NaCl), sodium
nitrite (NaNO
2
), butylated hydroxy anisole
(C
11
H
16
O
2
), butylated hydroxytoluene
(C
15
H
24
O), tert-butylhydroquinone
(C
10
H
14
O
2
), vinegar (CH3COOH), citric acid
(C6H8O7), spices, and calcium propionate
(C
6
H
10
CaO
4
) are all chemicals that
preserve foods.
Q.325. Which is the most popular coal in
commercial use?
SSC CGL 07/12/2022 (1st Shift)
(a) Bituminous (b) Anthracite
(c) Peat (d) Lignite
Sol.325.(a) Bituminous coal (Dark
brown, 45–86%). This coal is reviewed
based on versatility, dampness
substance, instability and cinder content.
Other types of coal: Peat ( precursor of
coal, 40% carbon), Lignite (25–35%,
brown coal), Anthracite (86–97%
carbon).
Q.326. Identify a dark-coloured
amorphous substance that is highly
resistant to microbial action and
undergoes decomposition at an
extremely slow rate.
SSC CGL 06/12/2022 (2nd Shift)
(a) Chitin (b) Humus
(c) Carotenoids (d) Colloids
Sol.326.(b) Humus. Chitin is the most
abundant amino polysaccharide polymer
occurring in nature. Chitin exists in the
shells of arthropods such as crabs,
shrimps, and insects. Carotenoids are
pigments that give yellow, orange, and
red fruits and vegetables their color. Our
body is able to convert some carotenoids
into vitamin A.
Q.327. Which of the following
greenhouse gases is most abundant in
the atmosphere?
SSC CGL 05/12/2022 (4th Shift)
(a) Nitrous Oxide (b) Water Vapour
(c) Methane (d) Carbon Oxide
Sol.327.(b) Water vapour. Greenhouse
gases: carbon dioxide (CO
2
) 65% ,
methane (CH
4
)16%, nitrous oxide (N
2
O),
6% ?uorinated gases
{(hydrochloro?uorocarbons (HCFCs),
per?uorocarbons (PFCs) and Sulphur
Hexa?uoride (SF
6
)} 2% and ozone (O
3
).
Q.328. Which of the following is used in
photography?
SSC CGL 05/12/2022 (1st Shift)
(a) Sodium bicarbonate
(b) Sodium thiosulphate
(c) Sodium hydroxide
(d) Sodium sulphate
Sol.328.(b) Sodium thiosulphate
(Na2S2O3) is used in photography to
remove undecomposed AgBr as soluble
silver thiosulphate complex. Antidote
agent against cyanide poisoning.
Dechlorination of small water bodies like
ponds, aquariums, etc. It is on the World
Health Organization's List of Essential
Medicines. Sodium sulphate (Na
2
SO
4
) -
detergents, paper pulping, cattle feed.
Q.329. ______ is found in association
with rocks composed of calcium
carbonates?
SSC CGL 03/12/2022 (1st Shift)
(a) Limestone (b) Gold
(c) Iron (d) Diamond
Sol.329.(a) Limestone is a sedimentary
rock made of calcium carbonate
(CaCO
3
), usually in the form of calcite or
aragonite. Some other examples of
sedimentary include Breccia,
Conglomerate, Sandstone, Siltstone, and
Shale. These rocks are formed by the
deposition and subsequent cementation
of the material at the Earth’s surface
within the bodies of water.
Q.330. Carbon dating means:
SSC CPO 09/11/2022 (Morning)
(a) a method to determine the density of
?ssile material.
(b) a method of calculating the remains
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of sulphur and nitrogen in hard rock.
(c) a method of calculating the age of
very old objects by measuring the
amounts of different forms of carbon
in them.
(d) a method of determination of weight
of a very old rock.
Sol.330.(c) Carbon-14 dating
(radiocarbon dating), method of age
determination that depends upon the
decay to nitrogen of radiocarbon
(carbon-14).The method was developed
in 1946 by Willard Libby.
Q.331. Which of the following chemicals
are vastly used in gunpowder of
?reworks?
SSC CPO 09/11/2022 (Afternoon)
(a) Silver nitrate and charcoal
(b) Silver nitrate and sulphur
(c) Potassium sulphate and Phosphorous
(d) Potassium nitrate, sulphur and
charcoal
Sol.331.(d) Potassium nitrate, Sulfur
and Charcoal . The most important
component of a ?rework is gunpowder
('black powder'). Aluminium is used to
produce silver and white ?ames and
sparks. Antimony (glitter effects), Barium
(green color), Calcium salts (orange
color), Barium (bright greens), strontium
(red), copper (blue), and sodium
(yellow). Carbon is used as a propellant
in ?reworks. It provides the fuel for
?reworks.
Q.332. The lead chromate which is toxic
and carcinogenic, is used for the
adulteration of __________ powder.
SSC CPO 10/11/2022 (Afternoon)
(a) chili (b) garlic (c) turmeric (d) ginger
Sol.332.(c) Turmeric . Lead(II) chromate
(PbCrO
4
) is carcinogenic (causes
cancer). Food adulteration can be
de?ned as the contamination or
adulteration of food or food materials by
adding harmful substances to it. Allicin
compound (garlic's aroma). Phenolic
compounds in ginger are gingerols,
shogaols, and paradols. Capsaicin is a
component of chili peppers. Turmeric
bright yellow colour is due to the
presence of curcumin .
Q.333. Mozzarella, cheddar and
camembert are varieties of:
Higher Secondary 03/08/2022 (Shift - 4 )
(a) yogurt (b) vinegar (c) bread (d) cheese
Sol.333.(d) Cheese. Types of Bread :-
Sourdough, Baguette, Brioche, Focaccia,
Pita, Whole-Grain, Challah, Naan etc.
Types of Yogurt :- Skyr/Icelandic,
Lactose-free, Australian etc. Types of
vinegar :- Apple Cider, Red and White
Vinegar, Balsamic, Malt etc.
Q.334. Which of the following chemical
compounds is a naturally occurring
orange/yellow pigment extracted from
turmeric, which is used as a spice, in
food colouring and as a traditional herbal
medicine?
Graduate Level 02/08/2022 (Shift - 3)
(a) Carmoisine (b) Tartrazine
(c) Curcumin (d) Cochineal
Sol.334.(c) Curcumin {(C
21
H
20
O
6
),
polyphenol with anti-in?ammatory
properties and the ability to increase the
amount of antioxidants that the body
produces}.
Q.335. Which sodium salt of glutamic
acid is commonly added to Chinese food,
canned vegetables, soups and processed
meats to enhance the ?avour?
Graduate Level 04/08/2022 (Shift - 2)
(a) Sodium carbonate
(b) Monosodium glutamate
(c) Gloxazone
(d) Metasodium glutamate
Sol.335.(b) Monosodium glutamate
( C5H8NO4Na ). Sodium carbonate
(Na
2
CO
3
), Uses – in the manufacture of
detergents, soaps, paper, water glass
(sodium silicate), borax, sodium
phosphate, and many other sodium
compounds. Gloxazone ( C
8
H
16
N
6
OS
2
).
Q.336. Which of the following chemical
compounds is used as a yeast de-foaming
agent, commonly found in butter, meat,
cereals, chewing gum, baked goods,
snack foods, dehydrated potatoes and
beer?
Graduate Level 04/08/2022 (Shift - 2)
(a) Butylated hydroxyanisole
(b) Chlorobenzoate
(c) Potassium Nitrate (PN)
(d) Benzene hexachloride
Sol.336.(a) Butylated hydroxyanisole
( C
11
H
16
O
2
). Chlorobenzoate (C
7
H
4
ClO
2
).
Potassium Nitrate (KNO
3
), Uses - food
preservatives, fertilizers, tree stump
removal, rocket propellants, and
?reworks. Potassium nitrate is a
common active ingredient in toothpaste,
exerting an anti-sensitivity action.
Benzene hexachloride (C
6
H
6
Cl
6
) is
commonly used as an insecticide and
also as a fungicide.
Q.337. At what temperature is milk
boiled for 15 to 30 seconds in the
pasteurisation process?
Higher Secondary 01/08/2022 (Shift - 3)
(a) 80° C (b) 72° C (c) 45° C (d) 60° C
Sol.337.(b) 72°C. Pasteurization is a
heat-treatment process that destroys
pathogenic microorganisms in certain
foods and beverages. Haelen processing
technique uses pressure treatment
instead of heat to kill harmful pathogens
and prolong shelf life of milk.
Pascalization or high pressure
processing (HPP) and pulsed electric
?eld (PEF) are non-thermal processes
that are also used to pasteurize foods.
Q.338. Eugenol is a major component of:
Higher Secondary 04/08/2022 (Shift - 3)
(a) turmeric (b) ginger
(c) clove essential oil (d) tamarind
Sol.338.(c) Clove essential oil. It is an
aromatic oil extracted from cloves that is
used widely as a ?avouring for foods and
to treat toothache.
Q.339. Starch in potatoes reacts with
_____, turning to a blue colour.
SSC MTS 12/07/2022 (Evening)
(a) ?uorine (b) Bromine
(c) Iodine (d) Chlorine
Sol.339.(c) Iodine. The group 17
elements include ?uorine(F), chlorine(Cl),
bromine (Br), iodine(I) and astatine(At)
from the top to the bottom. They are
called “halogens” because they give
salts when they react with metals.
Q.340. Which vegetable contains a
chemical called anthocyanin that turns
pink/reddish in the presence of acid,
turns purple when neutral and turns blue
or green when mixed with alkaline
substances?
SSC CHSL 24/05/2022 (Morning)
(a) Pomegranate (b) Red leaf lettuce
(c) Radish (d) Red cabbage
Sol.340.(d) Red Cabbage. Dietary
sources of anthocyanins are generally
easy to identify due to their red, blue, or
purple color. Examples include red
/purple cabbage, berries and red-skinned
grapes, pears, and apples and various
vegetables such as radishes etc. Purple
fruits and vegetables are high in
anthocyanin.
Q.341. Which inorganic compound is
used to manufacture soap, rayon, paper,
explosives, dyes, and petroleum
products?
SSC CHSL 25/05/2022 (Morning)
(a) NaOCl (b) NaOH
(c) CaOCl2 (d) NaHCO3
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FAQs on SSC CGL Previous Year Questions (2023-20): Chemistry - 2 - SSC CGL Previous Year Papers
| 1. What are some common concepts covered in the Chemistry section of the SSC CGL exam? |  |
Ans. Some common concepts covered in the Chemistry section of the SSC CGL exam include atomic structure, chemical bonding, periodic table, states of matter, thermodynamics, organic chemistry, and environmental chemistry.
| 2. How can I effectively prepare for the Chemistry section of the SSC CGL exam? | |
Ans. To prepare for the Chemistry section of the SSC CGL exam, it is essential to regularly practice numerical problems, revise key concepts, and focus on understanding the underlying principles. Utilizing study materials, mock tests, and previous year question papers can also aid in effective preparation.
| 3. Are there any specific topics in Chemistry that are frequently asked in the SSC CGL exam? | |
Ans. Yes, some specific topics in Chemistry that are frequently asked in the SSC CGL exam include chemical reactions, acids and bases, chemical kinetics, electrochemistry, and coordination compounds. It is advisable to focus on these topics while preparing for the exam.
| 4. How important is it to understand the basics of Chemistry for the SSC CGL exam? | |
Ans. Understanding the basics of Chemistry is crucial for the SSC CGL exam as it forms the foundation for more complex topics. Having a strong grasp of fundamental concepts will not only help in answering theoretical questions but also in solving numerical problems effectively.
| 5. Can practicing previous year question papers help in scoring well in the Chemistry section of the SSC CGL exam? | |
Ans. Yes, practicing previous year question papers can be highly beneficial in scoring well in the Chemistry section of the SSC CGL exam. It helps in familiarizing oneself with the exam pattern, types of questions asked, and time management, thereby improving overall performance.
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Nov 22, 2024 Last updated |
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