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Hydrogen CBSE Class 11 MCQ & Practice Questions

Practice Hydrogen MCQs for CBSE Class 11 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Hydrogen Revision Guide for CBSE Class 11 Chemistry

Hydrogen is part of CBSE Class 11 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Hydrogen, then test recall with mixed MCQs.

What to practise in Hydrogen

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Hydrogen before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for CBSE Class 11 Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 Hydrogen MCQs with Answers

These public questions are selected from the exact Hydrogen chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

1. Hydrogen belongs to:

  • A. Only Group 1
  • B. Only Group 17
  • C. Both Group 1 and Group 17 characteristics
  • D. Group 18
Answer: C
Explanation: Hydrogen shows similarities with both alkali metals and halogens.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

2. The isotope of hydrogen having one proton and one neutron is:

  • A. Protium
  • B. Deuterium
  • C. Tritium
  • D. Hydride
Answer: B
Explanation: Deuterium has one proton and one neutron.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

3. The radioactive isotope of hydrogen is:

  • A. Protium
  • B. Deuterium
  • C. Tritium
  • D. Hydronium
Answer: C
Explanation: Tritium contains one proton and two neutrons.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

4. The oxidation state of hydrogen in NaH is:

  • A. +1
  • B. -1
  • C. 0
  • D. +2
Answer: B
Explanation: Hydrogen is −1 in ionic metal hydrides.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

5. Which of the following is a saline (ionic) hydride?

  • A. CH₄
  • B. NaH
  • C. NH₃
  • D. HCl
Answer: B
Explanation: Alkali metals form ionic hydrides.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

6. Which hydride is electron-deficient?

  • A. NH₃
  • B. CH₄
  • C. B₂H₆
  • D. H₂O
Answer: C
Explanation: Diborane contains three-center two-electron bonds.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

7. Hydrogen is prepared in the laboratory by:

  • A. Electrolysis of molten NaCl
  • B. Reaction of Zn with dilute HCl
  • C. Heating CuO
  • D. Heating CaCO₃
Answer: B
Explanation: Zinc reacts with dilute acids to liberate H₂.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

8. Hydrogen acts as a reducing agent because it:

  • A. Accepts electrons
  • B. Removes oxygen from metal oxides
  • C. Forms only ionic bonds
  • D. Is inert
Answer: B
Explanation: Hydrogen reduces many metal oxides to metals.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

9. The bond dissociation enthalpy of H₂ is relatively:

  • A. Very low
  • B. High
  • C. Zero
  • D. Negative
Answer: B
Explanation: The H–H bond is quite strong.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

10. Heavy water is:

  • A. H₂O
  • B. D₂O
  • C. T₂O
  • D. HDO only
Answer: B
Explanation: Heavy water contains deuterium.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

11. Heavy water is used as:

  • A. Rocket fuel
  • B. Moderator in nuclear reactors
  • C. Drying agent
  • D. Bleaching agent
Answer: B
Explanation: D₂O slows down neutrons.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

12. The oxidation state of hydrogen in H₂O is:

  • A. +1
  • B. -1
  • C. 0
  • D. +2
Answer: A
Explanation: Hydrogen is +1 when bonded to non-metals.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

13. Which compound contains covalent hydride?

  • A. NaH
  • B. CaH₂
  • C. CH₄
  • D. LiH
Answer: C
Explanation: Methane is a covalent hydride.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

14. The gas evolved when Na reacts with water is:

  • A. O₂
  • B. Cl₂
  • C. H₂
  • D. CO₂
Answer: C
Explanation: Sodium liberates hydrogen from water.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

15. Hydrogen peroxide has the formula:

  • A. H₂O
  • B. H₂O₂
  • C. HO₂
  • D. H₃O
Answer: B
Explanation: Hydrogen peroxide contains an O–O bond.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

16. The oxidation state of oxygen in H₂O₂ is:

  • A. -2
  • B. -1
  • C. 0
  • D. +1
Answer: B
Explanation: Each oxygen has oxidation number −1.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

17. Hydrogen peroxide acts as:

  • A. Only oxidising agent
  • B. Only reducing agent
  • C. Both oxidising and reducing agent
  • D. Catalyst only
Answer: C
Explanation: It can undergo oxidation or reduction depending on conditions.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

18. The O–O bond in H₂O₂ is called:

  • A. Sigma bond only
  • B. Peroxide linkage
  • C. Hydrogen bond
  • D. Coordinate bond
Answer: B
Explanation: Peroxides contain an O–O single bond.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

19. Which hydride is polymeric?

  • A. CH₄
  • B. BeH₂
  • C. NH₃
  • D. HCl
Answer: B
Explanation: Solid BeH₂ has a polymeric structure.

CBSE Class 11 Chemistry · Hydrogen · Very Very Hard

20. The lightest element in the periodic table is:

  • A. Helium
  • B. Lithium
  • C. Hydrogen
  • D. Fluorine
Answer: C
Explanation: Hydrogen has atomic number 1.

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Hydrogen Practice Tests

Hydrogen Frequently Asked Questions

How should I prepare Hydrogen for CBSE Class 11 Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with Hydrogen practice?

This page provides public sample questions and links to published ChemNexa tests so you can combine quick revision with structured practice.

What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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