MCQ on Hydrogen and Its Compounds

One of the most common and important topics in the Chemistry general awareness section is Hydrogen and its Compounds. Many questions are coming from this section in every government exam like SSC, Railways, Banking, State PSC, etc. We are providing MCQs on Hydrogen and its Compounds topic so that candidates can practice questions on regular basis and fetch good marks in the general awareness section.

MCQ on  Hydrogen and Its Compounds:

Que 1. Which one of the given is used as a catalyst in the hydrogenation of vegetable oils?
(a) Zinc
(b) Nickel
(c) Iron
(d) Boron

Ans. (b) Nickel
Explanation: Nickel is used as a catalyst in the hydrogenation of vegetable oils.

Que 2. Which one of the given gases are used in the manufacture of vanaspati ghee from vanaspati oil?
(a) Hydrogen
(b) Nitrogen
(c) Oxygen
(d) Neon

Ans. (a) Hydrogen
Explanation: Hydrogen gas is used in the manufacture of vanaspati ghee from vanaspati oil.

Que 3. Name the process by which an Alum cleans the muddy water.
(a)  Dialysis
(b) Absorption
(c) Adsorption
(d) Coagulation

Ans. (d) Coagulation
Explanation: Coagulation is the process by which an Alum cleans the muddy water.

Que 4. What is the process of transforming salty water into pure water?
(a) Efflorescence
(b) Electric separation
(c) Desalination
(d) Deliquescence

Ans. (c) Desalination
Explanation: Desalination is the process of transforming salty water into pure water.

Que 5. Which of the given is used in the purification of drinking water?
(a) Helium
(b) Chlorine
(c) Fluorine
(d) Bromine

Ans. (b) Chlorine
Explanation: Chlorine is used in the purification of drinking water.

Que 6. Name the technique by which seawater changed into portable water.
(a) Decantation
(b) Distillation
(c) Ion exchange
(d) Desalination

Ans. (d) Desalination
Explanation: Desalination is the technique by which seawater is changed into portable water.

Que 7. What is the reason of being water is a good solvent?
(a) It has a high boiling point
(b) It has a high specific heat
(c) It has a high dipole moment
(d) It is colorless

Ans. (c) It has a high dipole moment
Explanation: The reason of being water is a good solvent is because it has a high dipole moment.

Que 8. What is the purest form of water in the given options?
(a) Rainwater
(b) Tap water
(c) Seawater
(d) Distilled water

Ans. (a) Rainwater
Explanation: Rainwater is the purest form of water.

Que 9. What is the pH value of pure water?
(a) 0
(b) 7
(c) 10
(d) 2

Ans. (b) 7
Explanation: The pH value of pure water is 7.

Que 10. What is the reason behind the hardness of water? 
(a) Due to chlorides and sulfates
(b) Due to magnesium bicarbonate
(c) Due to calcium bicarbonate sulfates
(d) All of the above

Ans. (d) All of the above
Explanation: The hardness of water is due to the presence of calcium and magnesium carbonates, bicarbonates, chlorides, and sulfates.

Que11. Hard water is not suitable for what purposes?
(a) Drinking
(b) Washing
(c) Irrigation
(d) All of the above

Ans. (d) All of the above
Explanation: Hard water is not suitable for drinking, washing, irrigation, etc.

Que 12. What is the chemical name of heavy water?
(a) Deuterium oxide
(b) Calcium oxide
(c) Magnesium oxide
(d) Sulphur dioxide

Ans. (a) Deuterium oxide
Explanation: The chemical name of heavy water is deuterium oxide(D₂O).

Que 13. What is the molecular weight of heavy water?
(a) 30
(b) 25
(c) 20
(d) 10

Ans. (c) 20
Explanation: The molecular weight of heavy water is 20.

Que 14. Who among the following discovered heavy water?
(a) H.C. Urey
(b) Joseph Priestly
(c) G. Mendel
(d) Heinrich Hertz

Ans. (a) H.C. Urey
Explanation: H.C. Urey discovered heavy water.

Que 15. Which of the given fuels causes the least air pollution?
(a) Diesel
(b) Hydrogen
(c) Coal
(d) Kerosene oil

Ans. (b) Hydrogen
Explanation: Hydrogen fuel causes the least air pollution.

Que 16. Which among the following is used as a moderator in nuclear reactors?
(a) Liquid Hydrogen
(b) Liquid Ammonia
(c) Heavy Water
(d) Portable Water

Ans. (c) Heavy Water
Explanation: Heavy Water is used as a moderator in nuclear reactors.

Que 17. What is the process of losing hydrogen atoms by an element?
(a) Hydrogenation
(b) Sublimation
(c) Reduction
(d) Oxidation

Ans. (d) Oxidation
Explanation: Oxidation is the process of the addition of oxygen and losing hydrogen atoms by an element.

Que 18. Hydrogen can act as?
(a) Reducing agent
(b) Oxidizing agent
(c) Both Reducing and Oxidizing agents
(d) None of these

Ans. (c) Both Reducing and Oxidizing agent
Explanation: Hydrogen can acts as both a reducing and oxidizing agent.

Que 19. Which among the given options is the lightest element?
(a) Chlorine
(b) Hydrogen
(c) Carbon dioxide
(d) Carbon monoxide

Ans. (b) Hydrogen
Explanation: Hydrogen is the lightest element.

Que 20. Which of the following are the isotopes of hydrogen?
(a) Protium
(b) Deuterium
(c) Tritium
(d) All of the above

Ans. (d) All of the above
Explanation: Protium, Deuterium, and Tritium are the isotopes of hydrogen.