Hydrogen Practice Questions

Class 11 · Chemistry · 2028 free MCQs with instant results and detailed explanations.

2028

Total

653

Easy

1028

Medium

347

Hard

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Topics in Hydrogen

Water 422

Properties 440

Hydrogen Peroxide 399

Heavy Water 362

Preparation of Hydrogen 405

Sample Questions from Hydrogen

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

What is the primary method of preparing hydrogen in the laboratory?

A. Electrolysis of water

B. Combustion of hydrocarbons

C. Heating ammonium chloride

D. Displacement reaction with metals

Show Answer & Explanation

Correct Answer: A

Electrolysis of water involves passing an electric current through water to separate hydrogen and oxygen.

Easy

Which of the following reactions produces hydrogen gas?

A. Zn + 2HCl → ZnCl2 + H2

B. CaCO3 → CaO + CO2

C. H2 + Cl2 → 2HCl

D. NaOH + HCl → NaCl + H2O

Show Answer & Explanation

Correct Answer: A

The reaction of zinc with hydrochloric acid produces hydrogen gas as a byproduct.

Easy

What gas is typically generated when water is electrolyzed?

A. Oxygen

B. Nitrogen

C. Hydrogen

D. Carbon Dioxide

Show Answer & Explanation

Correct Answer: C

Electrolysis of water produces hydrogen at the cathode and oxygen at the anode.

Medium

Which of the following methods can be used to prepare hydrogen gas?

A. Electrolysis of water

B. Combustion of magnesium

C. Neutralization of an acid

D. Sublimation of iodine

Show Answer & Explanation

Correct Answer: A

Electrolysis of water involves passing an electric current through water to break it down into hydrogen and oxygen gas, making it a valid method for hydrogen preparation.

Medium

What is the primary reactant when preparing hydrogen from hydrochloric acid?

A. Zinc

B. Calcium

C. Iron

D. Copper

Show Answer & Explanation

Correct Answer: A

Zinc reacts with hydrochloric acid to liberate hydrogen gas, making it the primary reactant in this reaction.

Medium

During the reaction of aluminum with sodium hydroxide, what product forms alongside hydrogen?

A. Sodium aluminate

B. Hydrochloric acid

C. Water

D. Aluminum hydroxide

Show Answer & Explanation

Correct Answer: A

The reaction of aluminum with sodium hydroxide produces sodium aluminate and hydrogen gas as a by-product.

Medium

Which of the following metals does NOT produce hydrogen gas when reacting with dilute acids?

A. Zinc

B. Iron

C. Copper

D. Magnesium

Show Answer & Explanation

Correct Answer: C

Copper does not react with dilute acids to produce hydrogen gas, making it the exception among the listed metals.

Hard

Which of the following methods is NOT used for the preparation of hydrogen gas?

A. Electrolysis of water

B. Reaction of metals with acids

C. Thermal decomposition of metal hydroxides

D. Neutralization of acids with bases

Show Answer & Explanation

Correct Answer: D

Neutralization of acids with bases produces salts and water, not hydrogen gas.

Hard

In the laboratory, which of the following metals is commonly used to generate hydrogen gas through reaction with dilute acids?

A. Copper

B. Magnesium

C. Gold

D. Silver

Show Answer & Explanation

Correct Answer: B

Magnesium readily reacts with dilute acids to produce hydrogen gas.

Q10

Hard

Which of the following reactions can produce hydrogen gas?

A. C + H2O → CO + H2

B. NaOH + HCl → NaCl + H2O

C. MgO + H2O → Mg(OH)2

D. Fe + H2O → Fe3O4 + H2

Show Answer & Explanation

Correct Answer: A

Carbon reacts with steam to produce carbon monoxide and hydrogen gas.

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Hydrogen — Class 11 Chemistry Practice Questions Online

This page contains 2028 practice MCQs for the chapter Hydrogen in Class 11 Chemistry. The questions are organized by difficulty — 653 easy, 1028 medium, 347 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.