Class 11 Chemistry MCQ – Hydrogen

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1. Which of the following is the most abundant element in the universe by mass?

a) Oxygen
b) Carbon
c) Helium
d) Hydrogen

Answer:

d) Hydrogen

Explanation:

Hydrogen makes up about 75% of the elemental mass of the universe.

2. Which isotope of hydrogen contains one proton and one neutron?

a) Protium
b) Deuterium
c) Tritium
d) Hydronium

Answer:

b) Deuterium

Explanation:

Deuterium has one proton and one neutron in its nucleus.

3. Which of the following forms of hydrogen is radioactive?

a) Protium
b) Deuterium
c) Tritium
d) Both b and c

Answer:

c) Tritium

Explanation:

Tritium is a radioactive isotope of hydrogen.

4. What is the oxidation state of hydrogen in most of its compounds?

a) +1
b) -1
c) 0
d) +2

Answer:

a) +1

Explanation:

In most of its compounds, hydrogen is in a +1 oxidation state.

5. The hydrogen obtained from water using electrolysis is:

a) Heavy hydrogen
b) Nascent hydrogen
c) Ortho hydrogen
d) Para hydrogen

Answer:

b) Nascent hydrogen

Explanation:

Nascent hydrogen is freshly formed hydrogen which is extremely reactive.

6. Which of the following gases is NOT a diatomic molecule?

a) Hydrogen
b) Nitrogen
c) Oxygen
d) Argon

Answer:

d) Argon

Explanation:

Argon is a noble gas and exists as single atoms, not diatomic molecules.

7. In which compound is hydrogen present in a -1 oxidation state?

a) H2O
b) CH4
c) NaH
d) H2

Answer:

c) NaH

Explanation:

In sodium hydride (NaH), hydrogen is in a -1 oxidation state.

8. Which of the following is NOT a property of hydrogen?

a) It is colorless
b) It is tasteless
c) It supports combustion
d) It is denser than air

Answer:

d) It is denser than air

Explanation:

Hydrogen is lighter than air.

9. The boiling point of liquid hydrogen is:

a) 77 K
b) 20 K
c) 273 K
d) 4.2 K

Answer:

b) 20 K

Explanation:

Liquid hydrogen boils at 20 K.

10. Which form of hydrogen has unpaired electrons?

a) Ortho hydrogen
b) Para hydrogen
c) Both
d) None

Answer:

a) Ortho hydrogen

Explanation:

Ortho hydrogen has unpaired electrons, while para hydrogen has paired electrons.

11. The process of producing hydrogen gas by reacting hot coke with steam is known as:

a) Electrolysis
b) Hydroforming
c) Lane's process
d) Bosch process

Answer:

d) Bosch process

Explanation:

The Bosch process involves reacting hot coke with steam to produce hydrogen gas.

12. Which of the following compounds is used in hydrogenation of oils?

a) Hydrogen peroxide
b) Hydrogen chloride
c) Hydrogen sulfide
d) Molecular hydrogen

Answer:

d) Molecular hydrogen

Explanation:

Molecular hydrogen (H2) is used in the hydrogenation of oils to produce fats.

13. Which metal is commonly used as a catalyst in the hydrogenation process?

a) Platinum
b) Nickel
c) Copper
d) Silver

Answer:

b) Nickel

Explanation:

Nickel is commonly used as a catalyst in the hydrogenation of unsaturated fats.

14. Water gas is a mixture of:

a) Hydrogen and oxygen
b) Carbon monoxide and hydrogen
c) Methane and hydrogen
d) Carbon dioxide and hydrogen

Answer:

b) Carbon monoxide and hydrogen

Explanation:

Water gas is a mixture of carbon monoxide and hydrogen.

15. Which isotope of hydrogen is used as a tracer in biochemical research?

a) Protium
b) Deuterium
c) Tritium
d) None of the above

Answer:

c) Tritium

Explanation:

Tritium, being radioactive, is used as a tracer in biochemical research.

16. In the electrolysis of water, hydrogen gas is formed at:

a) Anode
b) Cathode
c) Both anode and cathode
d) Neither anode nor cathode

Answer:

b) Cathode

Explanation:

During the electrolysis of water, hydrogen is released at the cathode.

17. The compound H2O2 is known as:

a) Heavy water
b) Hydrochloric acid
c) Hydrogen peroxide
d) Hydrogen sulfate

Answer:

c) Hydrogen peroxide

Explanation:

H2O2 is the chemical formula for hydrogen peroxide.

18. Which of the following statements about hydrogen is false?

a) It can act as both acid and base
b) It can exist in three isotopic forms
c) It can only form covalent bonds
d) It is the lightest element

Answer:

c) It can only form covalent bonds

Explanation:

Hydrogen can form both covalent and ionic bonds.

19. The Haber process is used for the commercial preparation of:

a) Hydrogen
b) Ammonia
c) Methane
d) Ethylene

Answer:

b) Ammonia

Explanation:

The Haber process combines nitrogen and hydrogen to produce ammonia.

20. Which form of hydrogen is present in the sun and other stars?

a) Molecular hydrogen
b) Atomic hydrogen
c) Protonic hydrogen
d) Ionic hydrogen

Answer:

b) Atomic hydrogen

Explanation:

Atomic hydrogen is present in high amounts in the sun and other stars.

Related MCQ (Multiple Choice Questions) :

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