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All questions of Metals and Non-metals for Class 10 Exam
Metal have ............no. of electrons in their outer most shell –
a)1 to 8b)7 to 9c)1 to 3d)10 to 12Correct answer is option 'C'. Can you explain this answer?
|
Gaurav Kumar answered |
Metals have 1-3 electrons in their outermost orbit. They are present on the extreme left of the periodic table. They tend to donate electrons and obtain the stable electronic configuration of the nearest noble gas. The valency on metals also ranges from 1-3 .
The best conductor of electricity among the following is:- a)Hg (Mercury)
- b)Al (Aluminum)
- c)Ag (Silver)
- d)Au (Gold)
Correct answer is option 'C'. Can you explain this answer?
The best conductor of electricity among the following is:
a)
Hg (Mercury)
b)
Al (Aluminum)
c)
Ag (Silver)
d)
Au (Gold)
|
Avinash Patel answered |
Metals are good conductors of electricity. silver is found in in pure form from the earth. so In the given options all are metals. Among them silver is the best conductor of electricity after second best conductor of electricity is gold.
Metal which is a poor conductor of heat is:- a)Zinc
- b)Lead
- c)Gold
- d)Copper
Correct answer is option 'B'. Can you explain this answer?
Metal which is a poor conductor of heat is:
a)
Zinc
b)
Lead
c)
Gold
d)
Copper
|
|
Anjana Khatri answered |
Although metals are supposed to be good conductors of electricity and heat,metals like mercury, lead, alloys of iron and chromium, titanium and stainless steel are poor conductors when compared to silver, copper and gold.
Identify the amphoteric oxide from the following:- a)MgO
- b)Na2O
- c)Al2O3
- d)K2O
Correct answer is option 'C'. Can you explain this answer?
Identify the amphoteric oxide from the following:
a)
MgO
b)
Na2O
c)
Al2O3
d)
K2O
|
|
Arun Sharma answered |
Amphoteric metal oxides react with both acids as well as bases to produce salt and water.
Aluminium oxide is an amphoteric oxide because it reacts with acids as well as bases and form salts and water.
Al2O3 + 6HCl → 2AlCl3 + 3H2O (Basic nature)
Aluminium Hydrochloric Aluminium Water
oxide acid chloride
Al2O3 + 2NaOH → 2NaAlO2 + H2O (Acidic nature)
Aluminium Sodium Sodium Water
oxide Hydroxide aluminate
All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.- a)Tungsten
- b)Mercury
- c)Gold
- d)Potassium
Correct answer is option 'B'. Can you explain this answer?
All metals exist as solid at room temperature except the metal ‘X’. Name the metal “X’.
a)
Tungsten
b)
Mercury
c)
Gold
d)
Potassium
|
|
Ananya Das answered |
It is the only metal that is liquid at room temperature. It has the lowest melting point and boiling point of any other metal. It has low thermal conductivity, and a quite low electrical conductivity. It is the only metal that doesn’t form diatomic molecules in the gaseous phase.
Which metal is present in Calcium Hydroxide?- a)C
- b)O
- c)Ca
- d)H
Correct answer is option 'C'. Can you explain this answer?
Which metal is present in Calcium Hydroxide?
a)
C
b)
O
c)
Ca
d)
H
|
|
Amit Sharma answered |
Calcium hydroxide Ca ( OH) 2 , has calcium ( Ca) which is a metal.
Which of the following non-metal is good conductor of electricity?- a)Graphite
- b)Phosphorus
- c)Hydrogen
- d)Bromine
Correct answer is option 'A'. Can you explain this answer?
Which of the following non-metal is good conductor of electricity?
a)
Graphite
b)
Phosphorus
c)
Hydrogen
d)
Bromine
|
|
Gaurav Kumar answered |
Carbon, in the form of Graphite is a good conductor of electricity. It conducts heat and electricity like a metal or a metalloid.
Which is the least conductor of heat –- a)Gold
- b)Platinum
- c)Silver
- d)Lead
Correct answer is option 'D'. Can you explain this answer?
Which is the least conductor of heat –
a)
Gold
b)
Platinum
c)
Silver
d)
Lead
|
|
Abhavya Mishra answered |
Lead is an element having atomic no. 82.It is a poor conductor of heat because it easily reacts with the atmospheric oxygen and form lead oxide, and we know that metal oxide are poor conductor of heat and electricity.
A lustrous non-metal is:- a)Iodine
- b)Bromine
- c)Chlorine
- d)Sulphur
Correct answer is option 'A'. Can you explain this answer?
A lustrous non-metal is:
a)
Iodine
b)
Bromine
c)
Chlorine
d)
Sulphur
|
Pooja Shah answered |
Non - metals do not have luster. They do not reflect light from their surface ( except iodine and diamond) . So, here a lustrous now Metal is iodine.
Non-metal generally form –- a)Anions
- b)Cations
- c)Ions
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Non-metal generally form –
a)
Anions
b)
Cations
c)
Ions
d)
None of these
|
Rajiv Gupta answered |
Nonmetals tend to form anions. With one, two, or three valence electrons metals tend to lose electrons to achieve a noble gas configuration. (It would require more energy to gain the 5 – 7 electrons needed to fill their valence shell.)
What happens when non-metals react with water?a) Hydrogen gas is formedb) Carbon dioxide gas is formedc) Non-metals do not react with waterd) None of these.Correct answer is option 'C'. Can you explain this answer?
b) Carbon dioxide gas is formed
c) Non-metals do not react with water
d) None of these.
Correct answer is option 'C'. Can you explain this answer?
|
|
Pooja Shah answered |
Non - metals do not react with water to evolve hydrogen gas. ( no reaction)
The lustre of a metal is due to:- a)Its high density
- b)Presence of free electrons
- c)Its high polishing
- d)Its chemical inertness
Correct answer is option 'B'. Can you explain this answer?
The lustre of a metal is due to:
a)
Its high density
b)
Presence of free electrons
c)
Its high polishing
d)
Its chemical inertness
|
Rohini Seth answered |
The lustre of a metal is due to presence of free electrons.
It has to do with the way light and electrons on the surface of metals interact. The outer electrons in a metal are almost not bound to any individual atom, thus are relatively free, and are concentrated on the surface. These electrons (electron density) tend to oscillate at a collective frequency.
Which one of the following metal reacts vigorously with oxygen and water?
- a)Sodium
- b)Iron
- c)Calcium
- d)Magnesium
Correct answer is option 'A'. Can you explain this answer?
Which one of the following metal reacts vigorously with oxygen and water?
a)
Sodium
b)
Iron
c)
Calcium
d)
Magnesium
|
|
Ananya Das answered |
Sodium metal reacts vigorously with oxygen and water.
The most malleable metal is –- a)Sodium
- b)Silium
- c)Gold
- d)Lead
Correct answer is option 'C'. Can you explain this answer?
The most malleable metal is –
a)
Sodium
b)
Silium
c)
Gold
d)
Lead
|
Neha Patel answered |
Gold is the most malleable of all metals; a single gram can be beaten into a sheet of 1 square meter, and an ounce into 300 square feet. Gold leaf can be beaten thin enough to become transparent." Pure Platinum is also quite plastic, as are pure Silver, pure copper, pure lead, and other metals.
Which one of the following is a poor conductor of heat?- a)Mercury
- b)Zinc
- c)Silver
- d)Copper
Correct answer is option 'A'. Can you explain this answer?
Which one of the following is a poor conductor of heat?
a)
Mercury
b)
Zinc
c)
Silver
d)
Copper
|
|
Anjana Khatri answered |
Silver is best conductor of heat while among metals lead is poorest conductor of heat. Cooper and aluminum are good conductor while mercury is a poor conductor. Although metals are supposed to be good conductors of electricity and heat,metals like mercury, lead, alloys of iron and chromium, titanium and stainless steel are poor conductors.
Which non-metal have semi conductor property–- a)Boron
- b)Carbon
- c)Silicon
- d)Magnesium
Correct answer is option 'C'. Can you explain this answer?
Which non-metal have semi conductor property–
a)
Boron
b)
Carbon
c)
Silicon
d)
Magnesium
|
|
Arun Sharma answered |
Silicon is doped with other Microelements to increase its conductivity. It is used in transistors, solar cells, semiconductor devices.
MCQ (Multiple Choice Questions) or Practice Quiz with solutions of Chapter - "Metals and Non-Metals" of Class 10 Science, the questions are available for practice Q. By which reaction metal is obtained from metal oxide ?- a)Liquefaction
- b)Reduction
- c)Calcination
- d)Roasting
Correct answer is option 'B'. Can you explain this answer?
MCQ (Multiple Choice Questions) or Practice Quiz with solutions of Chapter - "Metals and Non-Metals" of Class 10 Science, the questions are available for practice
Q. By which reaction metal is obtained from metal oxide ?
a)
Liquefaction
b)
Reduction
c)
Calcination
d)
Roasting
|
Vikas Kumar answered |
The method used to extract metals from the ore in which they are found depends on their reactivity. For example, reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide.
Which is the most abundant non-metal on the earth?- a)Sulphur
- b)Oxygen
- c)Silicon
- d)Phosphorus
Correct answer is option 'B'. Can you explain this answer?
Which is the most abundant non-metal on the earth?
a)
Sulphur
b)
Oxygen
c)
Silicon
d)
Phosphorus
|
Jaideep mukherjee answered |
Most Abundant Non-Metal on Earth:
Explanation:
Oxygen is the most abundant non-metal on Earth. It makes up around 21% of the Earth's atmosphere, and it is also found in the Earth's crust, oceans, and other compounds like water and rocks. Oxygen is essential for life as it is a key component of the air we breathe and is necessary for the respiration of living organisms.
Other Options:
Let's take a look at the other options and why they are not the most abundant non-metal on Earth:
a) Sulphur - Sulphur is a non-metal, but it is not the most abundant on Earth. Although it is found in large quantities in the Earth's crust and oceans, it is not as abundant as oxygen.
c) Silicon - Silicon is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often found in rocks and minerals like quartz and sand, but it is not as essential to life as oxygen.
d) Phosphorus - Phosphorus is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often used in fertilizers and is an important component of DNA, but it is not as essential to life as oxygen.
Conclusion:
In conclusion, oxygen is the most abundant non-metal on Earth. It is essential for life and is found in the Earth's atmosphere, crust, oceans, and other compounds.
Explanation:
Oxygen is the most abundant non-metal on Earth. It makes up around 21% of the Earth's atmosphere, and it is also found in the Earth's crust, oceans, and other compounds like water and rocks. Oxygen is essential for life as it is a key component of the air we breathe and is necessary for the respiration of living organisms.
Other Options:
Let's take a look at the other options and why they are not the most abundant non-metal on Earth:
a) Sulphur - Sulphur is a non-metal, but it is not the most abundant on Earth. Although it is found in large quantities in the Earth's crust and oceans, it is not as abundant as oxygen.
c) Silicon - Silicon is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often found in rocks and minerals like quartz and sand, but it is not as essential to life as oxygen.
d) Phosphorus - Phosphorus is a non-metal that is found in the Earth's crust, but it is not as abundant as oxygen. It is often used in fertilizers and is an important component of DNA, but it is not as essential to life as oxygen.
Conclusion:
In conclusion, oxygen is the most abundant non-metal on Earth. It is essential for life and is found in the Earth's atmosphere, crust, oceans, and other compounds.
The property of metals by which they can be beaten in to thin sheets is called-- a)Malleability
- b)Ductility
- c)Conduction
- d)Expansion
Correct answer is option 'A'. Can you explain this answer?
The property of metals by which they can be beaten in to thin sheets is called-
a)
Malleability
b)
Ductility
c)
Conduction
d)
Expansion
|
Ishan Choudhury answered |
Malleability: The property of metals by which they can be beaten into thin sheets is known as malleability.
For example, silver metal is beaten to make silver foil used for decorating sweets.
For example, silver metal is beaten to make silver foil used for decorating sweets.
NaHCO3 is chemical formula of –
- a)Sodium hydrogencarbonate
- b)Sodium carbonate
- c)Sodium hydroxide
- d)Sodium Chloride
Correct answer is option 'A'. Can you explain this answer?
NaHCO3 is chemical formula of –
a)
Sodium hydrogencarbonate
b)
Sodium carbonate
c)
Sodium hydroxide
d)
Sodium Chloride
|
|
Rahul Kapoor answered |
Sodium bicarbonate, also commonly known as baking soda, is commonly seen as a white, fine powder and has the chemical formula NaHCO3. It has one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms. It is a very useful chemical that is alkaline in nature.
Which allotrope of carbon conducts electricity?- a)Graphite
- b)Diamond
- c)Fullerene
- d)Both Graphite and Diamond
Correct answer is option 'A'. Can you explain this answer?
Which allotrope of carbon conducts electricity?
a)
Graphite
b)
Diamond
c)
Fullerene
d)
Both Graphite and Diamond
|
|
Neha Patel answered |
Graphite conducts electricity, due to delocalization of the pi bond electrons above and below the planes of the carbon atoms. These electrons are free to move, so are able to conduct electricity. However, the electricity is only conducted along the plane of the layers.
Which of the following property is generally not shown by metals?- a)Electrical conduction
- b)Dullness
- c)Ductility
- d)Sonority
Correct answer is option 'B'. Can you explain this answer?
Which of the following property is generally not shown by metals?
a)
Electrical conduction
b)
Dullness
c)
Ductility
d)
Sonority
|
Mohini choudhary answered |
The properties that should have for a metal are sonority, lustrous, maellability ductility, heat and electrical conductivity as dullness is not one of them it is the correct option
Which metal has high melting point- a)Sn
- b)W
- c)Sb
- d)Pb
Correct answer is option 'B'. Can you explain this answer?
Which metal has high melting point
a)
Sn
b)
W
c)
Sb
d)
Pb
|
|
Pooja Shah answered |
Of all metals in pure form, tungsten has the highest melting point (3,422 °C, 6,192 °F).
Which of the following metals will not react with oxygen,even when heated very strongly in air?- a)Zn
- b)Al
- c)Ag
- d)Fe
Correct answer is option 'C'. Can you explain this answer?
Which of the following metals will not react with oxygen,even when heated very strongly in air?
a)
Zn
b)
Al
c)
Ag
d)
Fe
|
|
Ananya Das answered |
Silver do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series. Hence they are called noble metals. But silver fades after some months or years due to its tendency to react with sulphur in air forming their sulphides
A non-metallic oxide which is neutral in nature is- a)CO
- b)CO2
- c)P2O5
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
A non-metallic oxide which is neutral in nature is
a)
CO
b)
CO2
c)
P2O5
d)
None of these
|
|
Amit Sharma answered |
Non - metals generally form acidic oxides but oxides of carbon and nitrogen are neutral in nature like CO and NO.
Metal A when dipped in solution of salt of metal B ,then metal B is displaced . this shows that- a)Metal A is more reactive than metal B
- b)Metal B is more reactive than metal A
- c)Metal A and metal B are equally reactive
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
Metal A when dipped in solution of salt of metal B ,then metal B is displaced . this shows that
a)
Metal A is more reactive than metal B
b)
Metal B is more reactive than metal A
c)
Metal A and metal B are equally reactive
d)
None of these
|
Kiran Mehta answered |
When metal A is dipped in a solution of salt of metal V, then metal B is displaced, this shows that metal A is more reactive than B. Only then it can displace B from its salt solution.
The constituent of hemoglobin is –
- a)Iron
- b)Sodium
- c)Copper
- d)Magnesium
Correct answer is option 'A'. Can you explain this answer?
The constituent of hemoglobin is –
a)
Iron
b)
Sodium
c)
Copper
d)
Magnesium
|
|
Ananya Das answered |
Iron is an essential element for blood production. About 70 percent of your body's iron is found in the red blood cells of your blood called hameoglobin.
Which of the following elements is metalloid –- a)Si
- b)Sb
- c)A and B
- d)Zn
Correct answer is option 'C'. Can you explain this answer?
Which of the following elements is metalloid –
a)
Si
b)
Sb
c)
A and B
d)
Zn
|
|
Kuldeep Raj answered |
Option c is correct friend.
Because, Silicon (Si) and Antimony (Sb) are both elements which having a property that resembles both metals and non-metals.
As you know the definition of Metalloids, so what it states?. It states that the elements which having a properties between metals and non-metals right!. It (Si and Sb) can both act as either negative or positive. It can able to accept the electrons and gain the electrons. So this both elements having a properties like metals and non-metals. So, these both (Si and Sb) are both belongs to the Metalloids.
Carnallite is the mineral of –- a)Na
- b)Ca
- c)Mg
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
Carnallite is the mineral of –
a)
Na
b)
Ca
c)
Mg
d)
All of these
|
|
Ravi Sharma answered |
Carnallite is an evaporite mineral a hydrated potassium magnesium chloride. It is variably colored yellow to white, reddish or blue. It occurs with a sequence of potassium and magnesium evaporite.
The sodium metal can be stored in –- a)Benzene
- b)Alcohol
- c)Kerosene
- d)Toluene
Correct answer is option 'C'. Can you explain this answer?
The sodium metal can be stored in –
a)
Benzene
b)
Alcohol
c)
Kerosene
d)
Toluene
|
|
Neha Patel answered |
Sodium is stored under kerosene because of its high chemical reactivity with almost all of other elements (for example oxygen from air which oxidizes it instantly). Kerosene and mineral oil are the only chemicals that make the sodium inert.
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस के कहाँ डूबने का भय लग रहा था?- a)झील में
- b)नदी में
- c)नाले में
- d)नहर में
Correct answer is option 'A'. Can you explain this answer?
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस के कहाँ डूबने का भय लग रहा था?
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस के कहाँ डूबने का भय लग रहा था?
a)
झील में
b)
नदी में
c)
नाले में
d)
नहर में
|
|
Amit Sharma answered |
The correct answer is A as
बस की रफ्तार तेज होने के कारण व्यक्ति को डर लग रहा था कि बस झील मे गोता लगा जाएगी।
बस की रफ्तार तेज होने के कारण व्यक्ति को डर लग रहा था कि बस झील मे गोता लगा जाएगी।
The magnesium is used in –- a)Flash bulb
- b)Grignard reagent
- c)Electron alloy
- d)All of these
Correct answer is option 'D'. Can you explain this answer?
The magnesium is used in –
a)
Flash bulb
b)
Grignard reagent
c)
Electron alloy
d)
All of these
|
|
Pooja Shah answered |
The magnesium is used in Flash bulb, Grignard reagent, Electron - alloy. When magnesium burns, it makes very bright white light. Elektron is an alloy containing magnesium (90%) , zinc, aluminum (9%) and other other Metals (1%) .
Which oxide is neutral ?- a)NO2
- b)MgO
- c)H2O
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Which oxide is neutral ?
a)
NO2
b)
MgO
c)
H2O
d)
None of these
|
|
Pooja Shah answered |
Neutral oxides show neither basic nor acidic properties and hence do not form salts when reacted with acids or bases, eg., water H2O, carbon monoxide CO etc. are neutral oxides.
Cinnabar is an ore of –- a)Mercury
- b)Copper
- c)Calcium
- d)Lead
Correct answer is option 'A'. Can you explain this answer?
Cinnabar is an ore of –
a)
Mercury
b)
Copper
c)
Calcium
d)
Lead
|
|
Krishna Iyer answered |
Cinnabar is a toxic mercury sulfide mineral with a chemical composition of HgS. It is the only important ore of mercury. It has a bright red color that has caused people to use it as a pigment, and carve it into jewelry and ornaments for thousands of years in many parts of the world. Because it is toxic, its pigment and jewelry uses have almost been discontinued.
In the reaction M + O2 →MO2 (super oxide) the metal is -- a)Li
- b)Na
- c)K
- d)Ba
Correct answer is option 'C'. Can you explain this answer?
In the reaction M + O2 →MO2 (super oxide) the metal is -
a)
Li
b)
Na
c)
K
d)
Ba
|
|
Rohan Kapoor answered |
M + O2 -- MO2 (super oxide)
Metal that has tendency to form super oxide : K (Potassium due to its large size)
Which metal does not react with oxygen –- a)Cu
- b)Au
- c)A and B
- d)Fe
Correct answer is option 'B'. Can you explain this answer?
Which metal does not react with oxygen –
a)
Cu
b)
Au
c)
A and B
d)
Fe
|
|
Navya Shree N answered |
Aluminium will not react with oxygen whereas copper react with O2 and becomes green or dark layer. Iron reacts with O2 and a brown colour will be deposited on it which is none other than iron. whereas aluminium will not react with O2.
Which is the least conductor of heat –- a)Gold
- b)Platinum
- c)Silver
- d)Lead
Correct answer is option 'D'. Can you explain this answer?
Which is the least conductor of heat –
a)
Gold
b)
Platinum
c)
Silver
d)
Lead
|
|
Krishna Iyer answered |
Lead being metal is a bad conductor of electricity and heat. Compared to other metals, lead is a poor conductor of heat while gold, silver, platinum are good conductors of heat.
The non-metal which is a liquid at room temperature–- a)Oxygen
- b)Fluorine
- c)Sulphur
- d)Bromine
Correct answer is option 'D'. Can you explain this answer?
The non-metal which is a liquid at room temperature–
a)
Oxygen
b)
Fluorine
c)
Sulphur
d)
Bromine
|
Armaanian Sonal answered |
Bromine is the only non-metal at room temperature because the intermolecular forces are strong enough so that it does not vaporize at room temperature.
Which chemical is known as king of chemicals –- a)H2CO3
- b)HCl
- c)CH3COOH
- d)H2SO4
Correct answer is option 'D'. Can you explain this answer?
Which chemical is known as king of chemicals –
a)
H2CO3
b)
HCl
c)
CH3COOH
d)
H2SO4
|
|
Krishna Iyer answered |
Sulfuric acid is commonly supplied at concentrations of 78, 93 or 98 percent. Sulphuric acid is sometimes referred to as the " King of chemicals " because it is produced.
Which compound is used in photography –- a)AgNO3
- b)Ag2O
- c)AgBr
- d)Ag3N
Correct answer is option 'C'. Can you explain this answer?
Which compound is used in photography –
a)
AgNO3
b)
Ag2O
c)
AgBr
d)
Ag3N
|
|
Sandeep Kumar answered |
As we know that,
AgBr is a soft pale yellow, water insoluble salt well known (along with other silver halides)
for its unusual sensitivity to light.
It also have b used for making the shroud of Turin.
this is the reason hope you have got the answer all the best.
AgBr is a soft pale yellow, water insoluble salt well known (along with other silver halides)
for its unusual sensitivity to light.
It also have b used for making the shroud of Turin.
this is the reason hope you have got the answer all the best.
Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.Reason (R): Carbon dioxide is given off in the reaction.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.
Reason (R): Carbon dioxide is given off in the reaction.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
|
|
Avinash Patel answered |
Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid as CO2 gas is released.
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R).
Mark the correct choice as:Assertion (A) : Highly reactive metals are obtained by electrolytic reduction.
Reason (R) : In the electrolytic reduction, metal is deposited at the cathode.- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R are true but R is not the correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.
Correct answer is option 'B'. Can you explain this answer?
Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R).
Mark the correct choice as:
Mark the correct choice as:
Assertion (A) : Highly reactive metals are obtained by electrolytic reduction.
Reason (R) : In the electrolytic reduction, metal is deposited at the cathode.
Reason (R) : In the electrolytic reduction, metal is deposited at the cathode.
a)
Both A and R are true and R is the correct explanation of A
b)
Both A and R are true but R is not the correct explanation of A.
c)
A is true but R is false.
d)
A is false but R is true.
|
Kamna Science Academy answered |
- Highly reactive metals, like sodium and potassium, are extracted through electrolytic reduction due to their reactivity, which prevents reduction by chemical means.
- In electrolytic reduction, metals are deposited at the cathode when an electric current passes through an ionic compound.
- Both statements are true: electrolytic reduction is used for highly reactive metals, and deposition occurs at the cathode.
- However, the reason does not explain why electrolytic reduction is specifically necessary for highly reactive metals, making the correct choice B.
- In electrolytic reduction, metals are deposited at the cathode when an electric current passes through an ionic compound.
- Both statements are true: electrolytic reduction is used for highly reactive metals, and deposition occurs at the cathode.
- However, the reason does not explain why electrolytic reduction is specifically necessary for highly reactive metals, making the correct choice B.
Assertion (A): Usually the sulphide ore is converted to oxide before reduction.Reason (R): Reduction of oxides occurs easier.- a)Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- b)Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- c)Assertion (A) is true but reason (R) is false.
- d)Assertion (A) is false but reason (R) is true.
Correct answer is option 'A'. Can you explain this answer?
Assertion (A): Usually the sulphide ore is converted to oxide before reduction.
Reason (R): Reduction of oxides occurs easier.
a)
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
b)
Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
c)
Assertion (A) is true but reason (R) is false.
d)
Assertion (A) is false but reason (R) is true.
|
|
Ananya Das answered |
Usually the sulphide ore is converted to oxide before reduction as oxides are easier to reduce.
Which of the following metal reacts neither with cold water nor with hot water but reacts with hot steam to produce hydrogen gas?- a)Mg
- b)Fe
- c)Na
- d)Ca
Correct answer is option 'B'. Can you explain this answer?
Which of the following metal reacts neither with cold water nor with hot water but reacts with hot steam to produce hydrogen gas?
a)
Mg
b)
Fe
c)
Na
d)
Ca
|
|
Neha Patel answered |
Metals react with water and produce metal oxides and hydrogen gas. It reacts with hot water to form magnesium hydroxide and hydrogen. Metals like aluminium, iron and zinc do not react either with cold or hot water. But they react with steam to form the metal oxide and hydrogen.
The non-metal which is a liquid at room temperature–- a)Oxygen
- b)Fluorine
- c)Sulphur
- d)Bromine
Correct answer is option 'D'. Can you explain this answer?
The non-metal which is a liquid at room temperature–
a)
Oxygen
b)
Fluorine
c)
Sulphur
d)
Bromine
|
|
Abhishek Phogat answered |
Bromine is liquid at room temperature...
The non-metal that is liquid at room temperature is:- a)Bromine
- b)Chlorine
- c)Hydrogen
- d)Iodine
Correct answer is option 'A'. Can you explain this answer?
The non-metal that is liquid at room temperature is:
a)
Bromine
b)
Chlorine
c)
Hydrogen
d)
Iodine
|
Panchi Chaudhary answered |
Bromine is correct answer.. Bromine is a liquid b' coz the intermolecular forces are strong enough so that it does not vapourise..Room temperature is usually taken as being 25 degree Celsius... At this temperature bromine is liquid...
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस की रफ्तार के बारे में क्या बताया गया है?- a)बढ़ रही थी
- b)कम होती जा रही थी
- c)ज्यों-की-त्यों थी
- d)इनमें से कोई नहीं
Correct answer is option 'B'. Can you explain this answer?
निम्नलिखित गद्यांशों को ध्यानपूर्वक पढ़कर नीचे दिए गए प्रश्नों के सही उत्तर विकल्पों में से चुनिए:
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस की रफ्तार के बारे में क्या बताया गया है?
बस की रफ्तार अब पंद्रह-बीस मील हो गई थी। मुझे उसके किसी हिस्से पर भरोसा नहीं था। ब्रेक फेल हो सकता है, स्टीयरिंग टूट सकता है। प्रकृति के दृश्य बहुत लुभावने थे। दोनों तरफ हरे-भरे पेड़ थे, जिन पर पक्षी बैठे थे। मैं हर पेड़ को अपना दुश्मन समझ रहा था। जो भी पेड़ आता, डर लगता कि इससे बस टकराएगी। वह निकल जाता तो दूसरे पेड़ का इंतजार करता। झील दिखती तो सोचता कि इसमें बस गोता लगा जाएगी।
प्रश्न: बस की रफ्तार के बारे में क्या बताया गया है?
a)
बढ़ रही थी
b)
कम होती जा रही थी
c)
ज्यों-की-त्यों थी
d)
इनमें से कोई नहीं
|
|
Kavya Saxena answered |
B is the correct option.बस की रफ्तार कम होती जा रही थी.
Which of the following metals is extracted only by electrolysis?- a)Zn
- b)Al
- c)Fe
- d)Cu
Correct answer is option 'B'. Can you explain this answer?
Which of the following metals is extracted only by electrolysis?
a)
Zn
b)
Al
c)
Fe
d)
Cu
|
|
Vikas Kumar answered |
The method used to extract metals from the ore in which they are found depends on their reactivity.
For example, reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide.
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