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Hydrogen JENPAS MCQ & Practice Questions

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

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Hydrogen Revision Guide for JENPAS Chemistry

Hydrogen is part of JENPAS 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 JENPAS 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.

JENPAS Chemistry · Hydrogen · Very Very Hard

1. The electronic configuration of hydrogen in its ground state is:

  • A. 2s1
  • B. 2p1
  • C. 1s1
  • D. 1s2
Answer: C
Explanation: Hydrogen has one electron in the 1s orbital.

JENPAS Chemistry · Hydrogen · Very Very Hard

2. Hydrogen resembles alkali metals because it has:

  • A. Two valence electrons
  • B. One valence electron
  • C. Seven valence electrons
  • D. A filled valence shell
Answer: B
Explanation: Like Group 1 elements, hydrogen has one valence electron.

JENPAS Chemistry · Hydrogen · Very Very Hard

3. Hydrogen resembles halogens because it needs how many electrons to complete its valence shell?

  • A. One
  • B. Two
  • C. Seven
  • D. Eight
Answer: A
Explanation: Hydrogen needs one electron to attain the helium configuration.

JENPAS Chemistry · Hydrogen · Very Very Hard

4. The most abundant isotope of hydrogen is:

  • A. Deuterium
  • B. Tritium
  • C. Hydronium
  • D. Protium
Answer: D
Explanation: Protium, 1H, is overwhelmingly the most abundant isotope.

JENPAS Chemistry · Hydrogen · Very Very Hard

5. Deuterium contains:

  • A. Two protons and one neutron
  • B. One neutron only
  • C. One proton and one neutron
  • D. One proton and two neutrons
Answer: C
Explanation: Deuterium is 2H with one proton and one neutron.

JENPAS Chemistry · Hydrogen · Very Very Hard

6. Tritium contains:

  • A. Three protons
  • B. One proton and two neutrons
  • C. One proton and one neutron
  • D. Two protons and one neutron
Answer: B
Explanation: Tritium is 3H.

JENPAS Chemistry · Hydrogen · Very Very Hard

7. Which hydrogen isotope is radioactive?

  • A. Tritium
  • B. Protium
  • C. Deuterium
  • D. All three equally
Answer: A
Explanation: Tritium is radioactive and undergoes beta decay.

JENPAS Chemistry · Hydrogen · Very Very Hard

8. D2O is commonly called:

  • A. Hard water
  • B. Distilled water
  • C. Superheated water
  • D. Heavy water
Answer: D
Explanation: D2O is deuterium oxide, known as heavy water.

JENPAS Chemistry · Hydrogen · Very Very Hard

9. Heavy water is used in some nuclear reactors mainly as a:

  • A. Oxidising agent
  • B. Strong acid
  • C. Moderator
  • D. Fuel
Answer: C
Explanation: D2O can slow neutrons while absorbing relatively few of them.

JENPAS Chemistry · Hydrogen · Very Very Hard

10. Laboratory hydrogen can be prepared by reacting dilute acid with:

  • A. Gold
  • B. An active metal such as Zn
  • C. Copper only
  • D. Silver only
Answer: B
Explanation: Zinc with dilute HCl or H2SO4 liberates hydrogen.

JENPAS Chemistry · Hydrogen · Very Very Hard

11. Zn + 2HCl gives:

  • A. ZnCl2 + H2
  • B. ZnH2 + Cl2
  • C. ZnCl + H2O
  • D. ZnO + HCl
Answer: A
Explanation: Zinc displaces hydrogen from dilute hydrochloric acid.

JENPAS Chemistry · Hydrogen · Very Very Hard

12. Industrially, hydrogen is commonly produced from methane by:

  • A. Chlorination
  • B. Nitration
  • C. Polymerisation
  • D. Steam reforming
Answer: D
Explanation: Steam reforming of methane is a major industrial route.

JENPAS Chemistry · Hydrogen · Very Very Hard

13. The water-gas shift reaction is:

  • A. CH4 + O2 -> CO2 + H2O
  • B. C + O2 -> CO2
  • C. CO + H2O -> CO2 + H2
  • D. CO2 + H2 -> CO + H2O only
Answer: C
Explanation: The water-gas shift converts CO and steam into CO2 and H2.

JENPAS Chemistry · Hydrogen · Very Very Hard

14. Hydrogen burns in oxygen to form mainly:

  • A. Hydride ion
  • B. Water
  • C. Hydrogen peroxide only
  • D. Ozone
Answer: B
Explanation: Combustion of hydrogen produces water.

JENPAS Chemistry · Hydrogen · Very Very Hard

15. A hydrogen-oxygen mixture can be:

  • A. Explosive
  • B. Always inert
  • C. Nonflammable
  • D. A noble-gas mixture
Answer: A
Explanation: Hydrogen-oxygen mixtures can ignite explosively.

JENPAS Chemistry · Hydrogen · Very Very Hard

16. Hydrogen can reduce heated CuO because it:

  • A. Adds oxygen
  • B. Produces chlorine
  • C. Increases copper oxidation state
  • D. Removes oxygen to form water
Answer: D
Explanation: H2 reduces CuO to Cu while forming water.

JENPAS Chemistry · Hydrogen · Very Very Hard

17. Hydrogen combines with nitrogen in the Haber process to form:

  • A. Hydrazine only
  • B. Ammonium chloride directly
  • C. Ammonia
  • D. Nitric acid directly
Answer: C
Explanation: N2 + 3H2 ⇌ 2NH3.

JENPAS Chemistry · Hydrogen · Very Very Hard

18. Hydrogenation of vegetable oils commonly uses:

  • A. Water only
  • B. Nickel catalyst
  • C. Sodium chloride
  • D. Calcium carbonate
Answer: B
Explanation: Ni catalyses addition of H2 across C=C bonds.

JENPAS Chemistry · Hydrogen · Very Very Hard

19. Hydrogen is considered a clean fuel at point of use because ideal combustion gives:

  • A. Water
  • B. CO2
  • C. SO2
  • D. NO2 necessarily
Answer: A
Explanation: Ideal H2 combustion produces water without carbon dioxide.

JENPAS Chemistry · Hydrogen · Very Very Hard

20. A major challenge in hydrogen fuel technology is:

  • A. Hydrogen cannot burn
  • B. It contains carbon
  • C. It is solid at room temperature
  • D. Safe and efficient storage
Answer: D
Explanation: Hydrogen has low volumetric energy density and requires special storage.

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Hydrogen Practice Tests

Hydrogen Frequently Asked Questions

How should I prepare Hydrogen for JENPAS 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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