Hydrogen — NEET UG practice

9 questions

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Sample questions with solutions

Q1 · 2026

Methane reacts with steam at 1273 K in the presence of nickel catalyst to form :

A.
CO and $H_2O$
B.
$CO_2$ and $H_2$
C.
$CO$ and $H_2$
D.
$CO_2$ and $H_2O$

Answer: C

Recall the industrial process for producing hydrogen from methane: When methane reacts with steam at high temperature in the presence of a nickel catalyst, it undergoes steam reforming, an important industrial method for the preparation of dihydrogen gas.
Write the balanced reaction: Given methane reacting with steam under these conditions,

CH_4(g) + H_2O(g) \xrightarrow[1273\,K]{Ni} CO + 3H_2

Identify the products formed: From the equation, the products are CO and $H_2$ , not $CO_2$ or water.

Hence, the answer is C. $CO$ and $H_2$ .

Q2 · 2023

Which of the following statements are NOT correct?

A. Hydrogen is used to reduce heavy metal oxides to metals.

B. Heavy water is used to study reaction mechanism.

C. Hydrogen is used to make saturated fats from oils

D. The $H-H$ bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.

E. Hydrogen reduces oxides of metals that are more active than iron.

Choose the most appropriate answer from the options given below:

A.
B, D only
B.
D, E only
C.
A, B, C only
D.
B, C, D, E only

Answer: B

Check statement A: Hydrogen is indeed used to reduce heavy metal oxides (like CuO, ZnO) to their respective metals, so this statement is correct.
Check statement B: Heavy water ( $D_2O$ ) is actually used to study reaction mechanisms, so this statement is also correct, and hence should not be marked as incorrect... but let's verify against the official answer choice.
Check statement C: Hydrogen is used in the hydrogenation of oils to form saturated fats (vegetable ghee), so this statement is correct.
Check statement D: The $H-H$ bond is formed by the overlap of two 1s orbitals, and this bond is actually quite strong; it is not the lowest bond dissociation enthalpy among single bonds between two atoms of any element, so this statement is incorrect.
Check statement E: Hydrogen cannot reduce oxides of highly reactive metals (metals more active than iron, such as Na, K, Ca), so this statement is also incorrect.
Combine the incorrect statements: Only D and E are not correct.

Hence, the answer is B. D, E only.

Q3 · 2022

The pollution due to oxides of sulphur gets enhanced due to the presence of:

(a) particulate matter (b) ozone (c) hydrocarbons (d) hydrogen peroxide

Choose the most appropriate answer from the options given below:

A.
(a), (d) only
B.
(a), (b), (d) only
C.
(b), (c), (d) only
D.
(a), (c), (d) only

Answer: B

Understand how $SO_2$ pollution is enhanced: Sulphur dioxide in polluted air gets oxidised to sulphur trioxide, and this oxidation can be catalysed or promoted by certain substances present in the air.
Effect of particulate matter: Particulate matter present in polluted air catalyzes the oxidation of $SO_2$ to $SO_3$ ,

2SO_2(g) + O_2(g) \to 2SO_3(g)

Effect of ozone: Ozone also promotes this oxidation,

SO_2(g) + O_3(g) \to SO_3(g) + O_2(g)

Effect of hydrogen peroxide: Hydrogen peroxide reacts directly with $SO_2$ to form sulphuric acid,

SO_2(g) + H_2O_2(l) \to H_2SO_4(aq)

Check hydrocarbons: Hydrocarbons are not established as agents enhancing this particular $SO_2$ oxidation pathway in the same way.

Hence, the answer is B. (a), (b), (d) only.

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