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Chemistry - Hydrogen

Practise 10 WBJEE previous year questions on Hydrogen, compiled from papers spanning 2009 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.

Hydrogen has been asked in 8 of the 18 years of WBJEE papers analysed (2009–2026), with 10 questions in all. 40% of them were easy, 60% moderate and 0% tough. Most of its questions came from 2014, with 2 questions that year. In the last three years (2024–2026) it had 1 question across 3 papers, about 0.3 per paper.

The chapter's 5 topics are not weighted equally: Preparation and Properties of Hydrogen (3 questions, 30%), Chemical properties of hydrogen peroxide (2 questions, 20%), and Hydrides (2 questions, 20%) have been asked the most. Over the last five years the most frequent topics have been Chemical properties of hydrogen peroxide (1) and Preparation and Properties of Hydrogen (1).

  1. 1A cm solution of liberates g of iodine from an acidified solution. The percentage strength of is close to2026Chemical properties of hydrogen peroxide
  2. 2Which of the following is radioactive?2022Preparation and Properties of Hydrogen
  3. 3and show similarity in2021Preparation and Properties of Hydrogen Peroxide
  4. 4How and why does the density of liquid water change on prolonged electrolysis?2020Preparation and Properties of Water
  5. 5Which statement is not correct for ortho and para hydrogen?2016Preparation and Properties of Hydrogen
  6. 6Commercial sample of is labeled as . Its % strength is nearly2014Preparation and Properties of Hydrogen Peroxide
  7. 7The hydrides of the first elements in groups namely and respectively show abnormally high values for melting and boiling points. This is due2014Hydrides
  8. 8In which of the following molecules is hydrogen bridge bond present?2010Hydrides
  9. 9Ortho-and para-hydrogens have2010Preparation and Properties of Hydrogen
  10. 10Blackened oil painting can be restored into original form by the action of :2009Chemical properties of hydrogen peroxide

Frequently Asked Questions

1.How many questions are available for Hydrogen?

This chapter includes 10 questions compiled from WBJEE papers spanning 2009 to 2026.

2.Are these questions only from WBJEE, or from other exams too?

These are WBJEE questions specifically for the Hydrogen chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Hydrogen an important chapter for WBJEE Chemistry?

Hydrogen has appeared in 8 of the 18 years of WBJEE papers covered here, with 10 questions across 8 papers - about one per paper it appears in.

4.What is the difficulty level of Hydrogen questions in WBJEE?

Of the 10 questions analysed for this chapter, 40% are easy, 60% moderate and 0% tough. 2014 had the most, with 2 questions.

5.Which topics in Hydrogen should I focus on?

These topics have carried the most weightage in Hydrogen:

  • Preparation and Properties of Hydrogen - 3 questions (30%)
  • Chemical properties of hydrogen peroxide - 2 questions (20%)
  • Hydrides - 2 questions (20%)
6.Is Hydrogen's weightage in WBJEE going up or down?

Across all 8 papers analysed, Hydrogen has averaged about 1.3 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.