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Chemistry - Hydrogen

Practise 95 JEE Main previous year questions on Hydrogen, compiled from papers spanning 2003 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 JEE Main tests.

Hydrogen has been asked in 15 of the 25 years of JEE Main papers analysed (2002–2026), with 95 questions in all. 57% of them were easy, 35% moderate and 8% tough. Most of its questions came from 2021, with 24 questions that year. In the last three years (2024–2026) it had 0 questions across 49 papers, about 0 per paper.

The chapter's 7 topics are not weighted equally: Preparation and Properties of Hydrogen (29 questions, 31%), Chemical properties of hydrogen peroxide (21 questions, 22%), and Preparation and Properties of Water (20 questions, 21%) have been asked the most. Preparation and Properties of Hydrogen has also led over the last five years, with 11 questions. Preparation and Properties of Water has produced the most tough questions (3).

  1. 1The mass of iron converted into by the action of g of steam is : (Given : Molar mass of H, O and Fe are , and g mol respectively) Assume iro02 Apr, 2026 (M)Preparation and Properties of Hydrogen
  2. 2During water-gas shift reaction15 Apr, 2023 (M)Preparation and Properties of Hydrogen
  3. 3Given below are two statements: Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of 13 Apr, 2023 (M)Preparation and Properties of Water
  4. 4Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Isotopes of hydrogen hav13 Apr, 2023 (E)Preparation and Properties of Hydrogen
  5. 5Match List I with List II List I Type of Hydride List II Example A Electron deficient hydride I MgH 2 B Electron rich hydride II HF C Electr12 Apr, 2023 (M)Hydrides
  6. 6Which hydride among the following is less stable?11 Apr, 2023 (E)Hydrides
  7. 7Given below are two reactions, involved in the commercial production of dihydrogen H 2 . The two reactions are carried out at temperature T 10 Apr, 2023 (M)Preparation and Properties of Hydrogen
  8. 8Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Physical properties of 10 Apr, 2023 (E)Preparation and Properties of Hydrogen
  9. 9Which of the following can reduce decomposition of H 2 O 2 on exposure to light08 Apr, 2023 (E)Chemical properties of hydrogen peroxide
  10. 10Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Loss of electron from hyd06 Apr, 2023 (M)Preparation and Properties of Hydrogen
  11. 11Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Hydrogen is an environment01 Feb, 2023 (M)Preparation and Properties of Hydrogen
  12. 12O - O bond length in H 2 O 2 is X than the O - O bond length in F 2 O 2 . The O - H bond length in H 2 O 2 is Y than that of the O - F bond 01 Feb, 2023 (E)Preparation and Properties of Hydrogen Peroxide
  13. 13The starting material for convenient preparation of deuterated hydrogen peroxide D 2 O 2 in laboratory is:01 Feb, 2023 (E)Preparation and Properties of Hydrogen Peroxide
  14. 14H 2 O 2 acts as a reducing agent in31 Jan, 2023 (M)Chemical properties of hydrogen peroxide
  15. 15Given below are two statements : Statement I : H 2 O 2 is used in the synthesis of Cephalosporin Statement II : H 2 O 2 is used for the rest31 Jan, 2023 (E)Chemical properties of hydrogen peroxide
  16. 16The strength of 50 volume solution of hydrogen peroxide is _____ g / L (Nearest integer). Given: Molar mass of H 2 O 2 is 34 g mol - 1 Molar30 Jan, 2023 (E)Preparation and Properties of Hydrogen Peroxide
  17. 17Which of the given compounds can enhance the efficiency of hydrogen storage tank?29 Jan, 2023 (M)Preparation and Properties of Hydrogen
  18. 18An indicator X is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with H 2 O 2 at29 Jan, 2023 (E)Chemical properties of hydrogen peroxide
  19. 1925 volume hydrogen peroxide means25 Jan, 2023 (M)Preparation and Properties of Hydrogen Peroxide
  20. 20In which of the following reactions the hydrogen peroxide acts as a reducing agent?24 Jan, 2023 (E)Chemical properties of hydrogen peroxide
  21. 21The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives29 Jul, 2022 (M)Preparation and Properties of Hydrogen
  22. 22Given below are two statements. Statement I : Stannane is an example of a molecular hydride. Statement II : Stannane is a planar molecule. I29 Jul, 2022 (E)Hydrides
  23. 23The metal salts formed during softening of hardwater using Clark s method are28 Jul, 2022 (M)Preparation and Properties of Water
  24. 24For kinetic study of the reaction of iodide ion with H 2 O 2 at room temperature : (A) Always use freshly prepared starch solution. (B) Alwa28 Jul, 2022 (M)Preparation and Properties of Hydrogen Peroxide
  25. 25The products obtained during treatment of hard water using Clark s method are28 Jul, 2022 (E)Preparation and Properties of Water
  26. 26On reaction with stronger oxidizing agent like KIO 4 , hydrogen peroxide oxidizes with the evolution of O 2 . The oxidation number of I in K28 Jul, 2022 (E)Chemical properties of hydrogen peroxide
  27. 27Given below are two statements: Statement I : Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions. Statement27 Jul, 2022 (M)Chemical properties of hydrogen peroxide
  28. 28Which of the following can be used to prevent the decomposition of H 2 O 2 ?26 Jul, 2022 (M)Chemical properties of hydrogen peroxide
  29. 29The reaction of H 2 O 2 with potassium permanganate in acidic medium leads to the formation of mainly25 Jul, 2022 (M)Chemical properties of hydrogen peroxide
  30. 30High purity 99 . 95 % dihydrogen is obtained by25 Jul, 2022 (E)Preparation and Properties of Hydrogen
  31. 31Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?29 Jun, 2022 (M)Chemical properties of hydrogen peroxide
  32. 32Hydrogen has three isotopes : protium H 1 , deuterium ( H 2 or D ) and tritium ( H 3 or T ). They have nearly same chemical properties but d28 Jun, 2022 (E)Preparation and Properties of Hydrogen
  33. 33Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonat26 Jun, 2022 (E)Chemical properties of heavy water
  34. 34The highest industrial consumption of molecular hydrogen is to produce compound of element :24 Jun, 2022 (M)Chemical properties of hydrogen
  35. 35Hydrogen peroxide reacts with iodine in basic medium to give :01 Sep, 2021 (E)Chemical properties of hydrogen peroxide
  36. 36Monomer of Novolac is :31 Aug, 2021 (M)Preparation and Properties of Hydrogen
  37. 37The number of hydrogen bonded water molecule(s) associated with stoichiometry CuSO 4 5 H 2 O is __________ .31 Aug, 2021 (M)Preparation and Properties of Water
  38. 38Which one of the following statements is incorrect ?31 Aug, 2021 (E)Preparation and Properties of Hydrogen
  39. 39Deuterium resembles hydrogen in properties but:27 Aug, 2021 (M)Preparation and Properties of Hydrogen
  40. 40Which one of the following methods is most suitable for preparing deionized water?26 Aug, 2021 (M)Preparation and Properties of Water
  41. 41Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Heavy water is us26 Aug, 2021 (E)Chemical properties of heavy water
  42. 42The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :-27 Jul, 2021 (E)Preparation and Properties of Hydrogen
  43. 43Which one of the following metals forms interstitial hydride easily ?25 Jul, 2021 (E)Hydrides
  44. 44Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R . Assertion A : The dihedral angles in H 220 Jul, 2021 (M)Preparation and Properties of Hydrogen Peroxide
  45. 45The single largest industrial application of dihydrogen is:20 Jul, 2021 (E)Chemical properties of hydrogen
  46. 46Given below are two statements: One is labelled as Assertion A and the other labelled as reason R Assertion A : During the boiling of water 18 Mar, 2021 (M)Chemical properties of heavy water
  47. 47In basic medium, H 2 O 2 exhibits which of the following reactions? (A) Mn 2 + Mn 4 + (B) I 2 I - (C) PbS PbSO 4 Choose the most appropriate18 Mar, 2021 (E)Chemical properties of hydrogen peroxide
  48. 48The INCORRECT statement(s) about heavy water is (are) (A) used as a moderator in nuclear reactor (B) obtained as a by-product in fertilizer 17 Mar, 2021 (M)Chemical properties of heavy water
  49. 49The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are :17 Mar, 2021 (E)Preparation and Properties of Water
  50. 50Given below are two statements: Statement I : H 2 O 2 can act as both oxidising and reducing agent in basic medium. Statement II : In the hy16 Mar, 2021 (M)Preparation and Properties of Hydrogen Peroxide

Frequently Asked Questions

1.How many questions are available for Hydrogen?

This chapter includes 95 questions compiled from JEE Main papers spanning 2003 to 2026.

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

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

3.Is Hydrogen an important chapter for JEE Main Chemistry?

Hydrogen has appeared in 16 of the 25 years of JEE Main papers covered here, with 95 questions across 86 papers - about one per paper it appears in.

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

Of the 95 questions analysed for this chapter, 57% are easy, 35% moderate and 8% tough. 2021 had the most, with 24 questions.

5.Which topics in Hydrogen should I focus on?

These topics have carried the most weightage in Hydrogen:

  • Preparation and Properties of Hydrogen - 29 questions (31%)
  • Chemical properties of hydrogen peroxide - 21 questions (22%)
  • Preparation and Properties of Water - 20 questions (21%)
  • Preparation and Properties of Water has produced the most tough questions (3).
6.Is Hydrogen's weightage in JEE Main going up or down?

Across all 86 papers analysed, Hydrogen has averaged about 1.1 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.