Hydrogen NEET MCQ

1. Which of the following isotopes of hydrogen is radioactive?

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

Answer:

c) Tritium

Explanation:

Tritium, with 2 neutrons, 1 proton, and 1 electron, is radioactive.

2. Hydrogen exhibits positive oxidation state in:

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

Answer:

d) HCl

Explanation:

In HCl, hydrogen exhibits a +1 oxidation state.

3. Which form of hydrogen is a liquid at very low temperatures?

a) Orthohydrogen
b) Parahydrogen
c) Nascent hydrogen
d) Atomic hydrogen

Answer:

b) Parahydrogen

Explanation:

Parahydrogen is more stable and is the form that exists as a liquid at very low temperatures.

4. Electrolysis of acidulated water produces:

a) Oxygen at the anode and hydrogen at the cathode
b) Hydrogen at the anode and oxygen at the cathode
c) Only oxygen
d) Only hydrogen

Answer:

a) Oxygen at the anode and hydrogen at the cathode

Explanation:

During electrolysis, oxidation occurs at the anode producing oxygen and reduction occurs at the cathode producing hydrogen.

5. Which of the following is not a use of hydrogen?

a) In the synthesis of ammonia
b) As a reducing agent in metallurgy
c) As an oxidizing agent in rockets
d) In the hydrogenation of oils

Answer:

c) As an oxidizing agent in rockets

Explanation:

Hydrogen acts as a fuel, not an oxidizing agent in rockets.

6. Which of the following is the correct order of boiling points for the isotopes of hydrogen?

a) H2 < D2 < T2
b) T2 < D2 < H2
c) H2 < T2 < D2
d) D2 < T2 < H2

Answer:

a) H2 < D2 < T2

Explanation:

Due to increasing molecular weight, the boiling point increases in the order H2 < D2 < T2.

7. In the water gas shift reaction, carbon monoxide reacts with steam to give:

a) Hydrogen
b) Carbon dioxide
c) Both hydrogen and carbon dioxide
d) Neither hydrogen nor carbon dioxide

Answer:

c) Both hydrogen and carbon dioxide

Explanation:

CO + H2O → CO2 + H2 is the water gas shift reaction.

8. Which of the following acids is not produced when hydrogen reacts with non-metals?

a) Hydrochloric acid
b) Hydrofluoric acid
c) Carbonic acid
d) Nitric acid

Answer:

d) Nitric acid

Explanation:

Nitric acid is not directly produced by the reaction of hydrogen with non-metals.

9. In the Lane's process, hydrogen is obtained by:

a) Electrolysis of water
b) Reaction of steam with red-hot coke
c) Reaction of steam with iron
d) From natural gas

Answer:

c) Reaction of steam with iron

Explanation:

Lane's process involves passing steam over red-hot iron.

10. Which hydrogen compound has a geometry that is linear?

a) H2O
b) CH4
c) BeH2
d) NH3

Answer:

c) BeH2

Explanation:

BeH2 has a linear geometry due to sp hybridization of beryllium.

11. Which form of hydrogen has an unpaired electron?

a) Orthohydrogen
b) Parahydrogen
c) Nascent hydrogen
d) Molecular hydrogen

Answer:

a) Orthohydrogen

Explanation:

Orthohydrogen has unpaired electrons which make it paramagnetic.

12. In liquid state, which hydrogen bond is the strongest?

a) H-F
b) H-O
c) H-N
d) H-H

Answer:

a) H-F

Explanation:

The H-F bond in hydrogen fluoride exhibits the strongest hydrogen bond due to the high electronegativity of fluorine.

13. Which of the following is not a form of hydrogen?

a) Orthohydrogen
b) Parahydrogen
c) Atomic hydrogen
d) Isotopic hydrogen

Answer:

d) Isotopic hydrogen

Explanation:

Isotopic hydrogen refers to the isotopes of hydrogen (Protium, Deuterium, Tritium) and not a specific form of hydrogen.

14. When exposed to UV light, molecular hydrogen splits into:

a) Two hydrogen atoms
b) Hydrogen and a proton
c) Hydrogen cation and anion
d) Hydrogen and an electron

Answer:

a) Two hydrogen atoms

Explanation:

Ultraviolet light dissociates molecular hydrogen into atomic hydrogen.

15. In the formation of a molecule of water, the number of hydrogen bonds formed is:

a) One
b) Two
c) Three
d) Four

Answer:

b) Two

Explanation:

Each water molecule can form two hydrogen bonds.

16. Which compound does not exhibit hydrogen bonding?

a) H2O
b) NH3
c) HCl
d) HF

Answer:

c) HCl

Explanation:

Hydrogen bonding requires a highly electronegative atom like F, O, or N. HCl does not exhibit hydrogen bonding.

17. What is the standard condition for the production of dihydrogen by electrolysis?

a) Acidified water using nickel electrodes
b) Pure water using platinum electrodes
c) Acidified water using platinum electrodes
d) Brine solution using graphite electrodes

Answer:

c) Acidified water using platinum electrodes

Explanation:

The electrolysis of acidulated water using platinum electrodes produces dihydrogen.

18. Which isotope of hydrogen is used as a moderator in nuclear reactors?

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

Answer:

b) Deuterium

Explanation:

Heavy water (D2O), which contains deuterium, is used as a moderator in nuclear reactors.

19. The hydrogen obtained from coal is termed as:

a) Coal hydrogen
b) Water gas
c) Producer gas
d) Marsh gas

Answer:

b) Water gas

Explanation:

When steam is passed over hot coal, water gas (a mixture of CO and H2) is produced.

20. Nascent hydrogen is:

a) Atomic hydrogen
b) Molecular hydrogen
c) Hydrogen ion
d) Hydrogen isotope

Answer:

a) Atomic hydrogen

Explanation:

Nascent hydrogen refers to hydrogen in its atomic form, just as it's produced and highly reactive.

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