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SSC CGL Exam  >  SSC CGL Test  >   Previous Year Papers  >  Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - SSC CGL MCQ

SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 with solutions


MCQ Practice Test & Solutions: Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 (100 Questions)

You can prepare effectively for SSC CGL SSC CGL Previous Year Papers with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4". These 100 questions have been designed by the experts with the latest curriculum of SSC CGL 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 60 minutes
  • - Number of Questions: 100

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Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 1
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What is the product of the reaction when anhydrite undergoes hydration?
[SSC CHSL 03/08/2023 (1st shift)]

Detailed Solution: Question 1

Gypsum (CaSO4·2H2O): Calcium sulphate (CaSO4) and water (H2O) 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, Scientific research. Magnesite is formed when magnesium-rich rocks are altered by metamorphism or chemical weathering. Used as a binding agent in flooring. Kaolin is a rock from which the clay mineral kaolinite is derived. Used as the principal ingredient in porcelain tableware.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 2
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Which organic compound has a pleasant almond aroma that is commonly used to impart almond flavour to chocolate and baked goods?
[SSC CGL 21/07/2023 (2nd shift)]

Detailed Solution: Question 2

Benzaldehydes (C7H6O). It is found in several essential oils: hyacinth, citronella, orris, cinnamon, sassafras, labdanum, and patchouli.

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Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 3
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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)]

Detailed Solution: Question 3

Carbon Dioxide (CO2). During the day plants take in carbon dioxide (CO2) and release oxygen through photosynthesis and at night carbon dioxide (CO2) is released through respiration. Exception: Snake plant, Areca palm plant, Aloe Vera plant, Tulsi, Neem plant, Peepal Tree, etc.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 4
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Silicon dioxide is found mostly in which of the following?
[SSC CHSL 13/03/2023 (3rd Shift)]

Detailed Solution: Question 4

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, (SiO2) : Major constituent of Sand, used in food additives.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 5
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An isotope of which of the following is used in the treatment of cancer?
[SSC CHSL 17/03/2023 (3rd Shift)]

Detailed Solution: Question 5

Cobalt (Atomic number - 27). Isotopes - Same atomic number but different mass numbers. Example - Isotopes of hydrogen - protium 1H1 , deuterium 1H2 or and tritium 1H3 . Isobars are atoms of different elements with different atomic numbers but have the same mass number. Example of a pair of isobar i.e.,40Ca20 and 40Ar18.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 6
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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)]

Detailed Solution: Question 6

Glycogen (polysaccharide of glucose ; C24H42O21). Maltose (C12H22O11) is a disaccharide consisting of two units of glucose. Glucose (C6H12O6) is a simple sugar monosaccharide having two isoforms, alpha and beta. Starch {(C6H10O5)n} is a polysaccharide produced by most green plants for energy storage.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 7
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Which is the most popular coal in commercial use?
[SSC CGL 07/12/2022 (1st Shift)]

Detailed Solution: Question 7

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).

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 8
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Which of the following is used in photography?
[SSC CGL 05/12/2022 (1st Shift)]

Detailed Solution: Question 8

Sodium thiosulphate (Na2S2O3) is used in photography to remove undecomposed AgBr as a soluble silver thiosulphate complex. It is also an antidote against cyanide poisoning and used for dechlorination of small water bodies like ponds and aquariums.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 9
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Which sodium salt of glutamic acid is commonly added to Chinese food, canned vegetables, soups, and processed meats to enhance flavor?
[Graduate Level 04/08/2022 (Shift - 2)]

Detailed Solution: Question 9

Monosodium glutamate (C5H8NO4Na). Sodium carbonate (Na2CO3) is used in manufacture of detergents, soaps, paper, water glass (sodium silicate), borax, sodium phosphate, and many other sodium compounds. Gloxazone (C8H16N6OS2).

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 10
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Eugenol is a major component of:
[Higher Secondary 04/08/2022 (Shift - 3)]

Detailed Solution: Question 10

Clove essential oil. It is an aromatic oil extracted from cloves that is used widely as a avouring for foods and to treat toothache.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 11
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Starch in potatoes reacts with _____, turning to a blue colour.
[SSC MTS 12/07/2022 (Evening)]

Detailed Solution: Question 11

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.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 12
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Which chemical compound is composed of magnesium, sulphur and oxygen and is commonly used in detox bath to relax muscles and relieve pain in the shoulders, neck, back and scalp?
[SSC CHSL 02/06/2022 (Afternoon)]

Detailed Solution: Question 12

Epsom salt is also known as magnesium sulphate. Potash alum is also known as potassium alum or potassium aluminium sulphate. Rock salt is the common name for halite. Glauber's salt is the decahydrate form of sodium sulphate. It is also known as mirabilite.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 13
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Why is water uoridation, which is the controlled adjustment of uoride to public water supply, done?
[SSC CGL 11/04/2022 (Evening)]

Detailed Solution: Question 13

To prevent tooth decay. Fluoride is the ionic form of uorine. Fluoride is a natural mineral that is found in many foods and in all drinking water. Chemical Formula of Fluoride- F– .

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 14
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Which of the following is one of the main active sulphur-containing compounds present in garlic and onion?
[SSC MTS 11/10/2021 (Morning)]

Detailed Solution: Question 14

Allicin (Diallyl thiosulfinate). It is an oily, slightly yellow liquid that gives garlic its unique odour.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 15
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Complete the statement: Sodium hydrogen carbonate is used ______.
[SSC MTS 11/10/2021 (Afternoon)]

Detailed Solution: Question 15

Sodium hydrogen carbonate or sodium bicarbonate is used as a fire extinguisher. When heated to a high temperature, the chemical properties of this salt make it produce lots of carbon dioxide and remove oxygen. This reduces the amount of oxygen and puts the fire out.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 16
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Whitewashed walls appear to be shiny after three to four days due to the formation of:
[SSC MTS 20/10/2021 (Evening)]

Detailed Solution: Question 16

Calcium carbonate (CaCO3) (also known as chalk), mined as calcite, is the most commonly used filler for PVC.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 17
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Which of the following acids is used in the purication of gold and silver?
[SSC CGL 18/08/2021 (Evening)]

Detailed Solution: Question 17

Nitric acid. It dissolves the impurities like various metal oxides present on the surface of gold. Gold is insoluble in HNO3. Nitric acid (HNO3)- It is also known as aqua fortis or spirit of nitre. It is a strong corrosive acid.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 18
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When we cut an onion, the synthase enzyme converts the amino acid sulfoxides of the onion into which acid?
[SSC CGL 03/03/2020 (Afternoon)]

Detailed Solution: Question 18

Sulfenic acid. When we cut onion it actually breaks the microscopic cell lled with enzymes which after reaction with air makes a lachrymatory compound which is similar to the compound of tear gas.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 19
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By whom was the equation C = KPgas formulated in 1803?
[SSC Stenographer 13/10/2023 (Afternoon)]

Detailed Solution: Question 19

William Henry. In 1803 a scientist named William Henry formulated a new law which soon became known as Henry’s Law. He discovered that “At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.”

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 20
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In which year did Albert Einstein predict a new state of matter, the Bose-Einstein condensate (BEC), based on a quantum formulation by the Indian physicist Satyendra Nath Bose?
[SSC CPO 04/10/2023 (Morning)]

Detailed Solution: Question 20

1924. Bose-Einstein condensates are described as the fifth state of matter, alongside solids, liquids, gases, and plasmas. This matter occurs when particles (bosons) are cooled to near absolute zero (-273.15 degrees Celsius, or -460 degrees Fahrenheit). Discoveries of Albert Einstein: Theory of Relativity, Photoelectric Effect, Mass-Energy Equivalence (E = mc²).

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 21
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In 1957, who redened a model that predicted the shape of individual molecules based on the extent of electron-pair electrostatic repulsion?
[SSC CPO 04/10/2023 (Morning)]

Detailed Solution: Question 21

Nyholm and Gillespie. Scientists and discovery: Pauling - He discovered the alpha-helix structure of proteins and discovered that sickle-cell anaemia is a molecular disease. Heitler and London - Valence bond method. Staudinger - Theories on the polymer structures of bres and plastics. Perey - Francium.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 22
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In 1932, who discovered the positron, a particle described as ‘carrying a positive charge but having a mass of the same order of magnitude as that normally possessed by a free negative electron’?
[SSC CPO 05/10/2023 (Evening)]

Detailed Solution: Question 22

Carl Anderson. Awards: Nobel Prize in Physics (1936) for the discovery of a positively charged particle called the ‘positron’.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 23
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Who started the chemical revolution in the 18th century by naming oxygen and helping to organise chemical nomenclature?
[SSC MTS 14/09/2023 (2nd Shift)]

Detailed Solution: Question 23

Antoine-Laurent Lavoisier - He is known for his discovery of oxygen's role in combustion and respiration.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 24
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In 1937, who along with Sir Christopher Ingold proposed nucleophilic substitution reactions of alkyl halides and related compounds?
[SSC CHSL 04/08/2023 (3rd shift)]

Detailed Solution: Question 24

Edward Davies Hughes. He was elected as a fellow of the Royal Society in 1949.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 25
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In 1950, which Russian astronomer revised the 'nebular hypothesis’, proposing that the sun is surrounded by a solar nebula consisting mainly of hydrogen and helium as well as dust?
[SSC CHSL 07/08/2023 (2nd shift)]

Detailed Solution: Question 25

Otto Schmidt. George Gamow - "Big Bang" theory of the origin of the universe and in 1954 his studies in biology led him to suggest that the genetic code was a triplet code. Naum Idelson - Soviet theoretical astronomer and expert in the history of physics and mathematics.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 26
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When did Louis Pasteur discover molecular chirality and observe that crystals of some compounds exist as mirror images which laid the foundation for modern stereochemistry?
[SSC CHSL 10/08/2023 (3rd shift)]

Detailed Solution: Question 26

1848. Molecular Chirality - A molecule or ion is chiral if it is non-superimposable. Scientists and their discoveries: J.J. Thomson - Electron in 1897, Marie & Pierre Curie - Radium in 1898, Albert Einstein - Special theory of relativity in 1905, James Chadwick - Neutron in 1932, Dmitri Mendeleev - Modern periodic table in 1869, Henri Becquerel - Radioactivity in 1896.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 27
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In which year did Antoine Lavoisier publish 'Methods of Chemical Nomenclature', which included the rules for naming chemical compounds that are still in use today?
[SSC CGL 26/07/2023 (2nd shift)]

Detailed Solution: Question 27

1787. In 1774, Lavoisier (Father of modern chemistry) did many experiments investigating combustion that would discover oxygen. In 1789, he published the rst periodic table, his ndings describing the law of conservation of mass. Book - “Elementary Treatise of Chemistry”, “Elements of Chemistry”.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 28
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In 1931, who recognised that an aromatic compound must have an odd number of pairs of electrons, which can mathematically be written as 4n + 2 (n = 0,1,2,3 etc.)?
[SSC CGL 12/12/2022 (1st Shift)]

Detailed Solution: Question 28

Erich Huckel (1931). Two major contributions: the Debye–Huckel theory of electrolytic solutions and the Huckel method of approximate molecular orbital (MO) calculations on π electron systems.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 29
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In which year Gay Lussac's Law of Gaseous Volumes was given by Gay Lussac?
[SSC CGL 09/12/2022 (1st Shift)]

Detailed Solution: Question 29

1808 . Four Gas Laws: Gay-Lussac's Law gives relation between the pressure exerted by a gas and the absolute temperature. Boyle's Law (1662) gives relation between the pressure and the volume of a gas, Charles's Law (1780) gives relation between the volume occupied by a gas and the absolute temperature. Avogadro's Law (1811) gives relation between the volume occupied by a gas and the amount of gaseous substance.

Test: SSC CGL Previous Year Questions: Chemistry (2023-20) - 4 - Question 30
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The British physicist named Paul Dirac was known to have introduced the concept of _________ in 1930.
[SSC CGL 09/12/2022 (1st Shift)]

Detailed Solution: Question 30

Antiparticles are subatomic particles having the same mass as one of the particles of ordinary matter but opposite electric charge and magnetic moment. Examples are positron, antineutron, antiproton and antineutrino.

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