JEE Main · Chemistry · Hydrogen
Hydrogen and Hydrides: JEE Main previous year questions
62 questions in the 108 JEE Main shifts Lumi analysed, in 4 of 8 years. Pattern: Gone quiet. 0 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 62
- in 56 of 108 shifts
- Years asked
- 4/8
- last asked 2023
- Since 2024
- Quiet
- 0 questions in 2024–26
- Weighted estimate
- –
- history: 0.4 a shift on average, typically 0.0–0.8
Key findings
- 01
Asked in 4 of 8 years with analysed shifts and in 56 of 108 shifts: 62 questions, #37 of 196 topics. Last asked in 2023.
- 02
61% of its questions since 2020 tested an idea no earlier year had asked; 16 repeated an idea from the year before.
- 03
The most repeated idea is Isotopes of Hydrogen, asked 5 times in 5 shifts (2020, 2021, 2022, 2023), most often as “incorrect statement selection on hydrogen”.
- 04
JEE Main has asked 29 of the 48 ideas in this topic; 17 have never been asked, directly or inside another question.
- 05
Mostly asked as single correct (61%); 8% need a numerical answer, 65% are easy and 0% hard. It went down from 0.6 to 0.0 questions a shift since 2024.
- 06
The skill tested most is recall (66%), then conceptual (21%).
Questions a shift, year by year
Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.
Raw count: 2017: 0 in 1 shift · 2020: 6 in 12 shifts · 2021: 26 in 24 shifts · 2022: 18 in 24 shifts · 2023: 12 in 12 shifts · 2024: 0 in 18 shifts · 2025: 0 in 8 shifts · 2026: 0 in 9 shifts.
- Up to 2023
- 0.6
- a shift, of 25
- Since 2024
- 0.0
- -0.6
- Usual gap
- 1.0 yrs
- between years asking it
- Shifts with it
- 56/108
- 52% of analysed shifts
How it is asked
Difficulty, format and skill
Across all 62 questions on Hydrogen and Hydrides since 2017.
Difficulty
QUESTIONS- Easy40 · 65%
- Medium22 · 35%
- Hard0 · 0%
Format
SHARE- Single correct · 38 Q61%
- Two statements · 7 Q11%
- Other · 6 Q10%
- Numerical value · 5 Q8%
- Assertion–reason · 4 Q6%
- Match the list · 2 Q3%
Skill tested
SHARE- Recall · 41 Q66%
- Conceptual · 13 Q21%
- Application · 5 Q8%
- Calculation · 3 Q5%
Repeats
New idea, or one asked before?
Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 29 of the 48 ideas in this topic. 17 have never been asked yet.
- Asked directly29 · 60%
- Touched inside another question2 · 4%
- Never asked17 · 35%
Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.
Drill down
Chapter, idea, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
27 ideas inside
Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.
Ideas
Every idea inside this topic
29 different ideas were tested; 21 came more than once.
incorrect statement selection on hydrogen
Single correct · 5 shiftsstatement i/ii on preparation of gases
Single correct · 4 shiftscount correct statements on hydrogen peroxide
Single correct · 4 shifts · 1 numericalstatement i/ii on water softening
Single correct · 3 shiftsconditions of industrial dihydrogen reactions
Single correct · 3 shiftsstatement i/ii on hydrogen peroxide
Other · 3 shiftsassertion-reason on water hardness
Single correct · 3 shiftsnumerical relation between isotope properties
Single correct · 3 shiftsmatch hydride types to examples
Match the list · 2 shiftsproducts of electrolysis of brine
Single correct · 2 shiftsassertion-reason on hydrogen isotopes
Assertion–reason · 2 shiftsidentify stabilizer or condition for compound
Single correct · 2 shiftsstatement selection on water hardness
Numerical value · 2 shifts · 1 numericalstatement i/ii on bonding in copper sulphate pentahydrate
Numerical value · 2 shifts · 1 numericalhydrogen peroxide prepared from barium peroxide
Single correct · 2 shiftsidentify method of preparing a substance
Single correct · 2 shiftsstatement i/ii on hydrides and heterocycle basicity
Match the list · 2 shiftsproducts of h2o2 with acidified permanganate
Single correct · 2 shiftsincorrect statement about heavy water
Other · 2 shiftsidentify isotope by radioactivity
Single correct · 2 shiftsmass percentage and molarity from volume strength of h2o2
Numerical value · 2 shifts · 1 numericalorder/ranking of stability of hydrides
Single correct · 1 shifthydrogen bonding in ice
Numerical value · 1 shift · 1 numericaldefinition recall
Single correct · 1 shiftidentify product then recall its dihedral angle
Single correct · 1 shiftproduct of dihydrogen with metal oxide
Single correct · 1 shiftstatement on calgon method
Single correct · 1 shifthydroformylation product of 1-butene
Single correct · 1 shiftmetal forming interstitial hydride
Single correct · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Isotopes of Hydrogenincorrect statement selection on hydrogen | 5 | 5 | Single correctRecall | – | |
| Syngas Production via Reformingstatement i/ii on preparation of gases | 4 | 4 | Single correctRecall | – | |
| Redox Behavior of Hydrogen Peroxidecount correct statements on hydrogen peroxide | 4 | 4 | Single correctApplication | 1 | |
| Ion-Exchange Resins for Water Softeningstatement i/ii on water softening | 3 | 3 | Single correctRecall | – | |
| Water-Gas Shift Reactionconditions of industrial dihydrogen reactions | 3 | 3 | Single correctRecall | – | |
| Oxidizing Action of H2O2statement i/ii on hydrogen peroxide | 3 | 3 | OtherApplication | – | |
| Temporary Hardness and Clark's Methodassertion-reason on water hardness | 3 | 3 | Single correctRecall | – | |
| H-H Bond Dissociation Enthalpynumerical relation between isotope properties | 3 | 3 | Single correctRecall | – | |
| Covalent Hydride Typesmatch hydride types to examples | 2 | 2 | Match the listConceptual | – | |
| Dihydrogen from Brine Electrolysisproducts of electrolysis of brine | 2 | 2 | Single correctRecall | – | |
| Kinetic Isotope Effect in Hydrogenassertion-reason on hydrogen isotopes | 2 | 2 | Assertion–reasonConceptual | – | |
| Storage and Stabilization of H2O2identify stabilizer or condition for compound | 2 | 2 | Single correctRecall | – | |
| Causes of Temporary and Permanent Hardnessstatement selection on water hardness | 2 | 2 | Numerical valueCalculation | 1 | |
| Classification of Hydratesstatement i/ii on bonding in copper sulphate pentahydrate | 2 | 2 | Numerical valueConceptual | 1 | |
| H2O2 Preparation from Barium Peroxidehydrogen peroxide prepared from barium peroxide | 2 | 2 | Single correctRecall | – | |
| High Purity Dihydrogen Preparationidentify method of preparing a substance | 2 | 2 | Single correctRecall | – | |
| Ionic or Saline Hydridesstatement i/ii on hydrides and heterocycle basicity | 2 | 2 | Match the listConceptual | – | |
| Reducing Action of H2O2products of h2o2 with acidified permanganate | 2 | 2 | Single correctRecall | – | |
| Heavy Water Propertiesincorrect statement about heavy water | 2 | 2 | OtherRecall | – | |
| Radioactive Decay of Tritiumidentify isotope by radioactivity | 2 | 2 | Single correctRecall | – | |
| Volume Strength of H2O2mass percentage and molarity from volume strength of h2o2 | 2 | 2 | Numerical valueCalculation | 1 | |
| Polymeric s-Block Hydridesorder/ranking of stability of hydrides | 1 | 1 | Single correctConceptual | – | |
| Structure and Density of Icehydrogen bonding in ice | 1 | 1 | Numerical valueRecall | 1 | |
| Clark's Method for Temporary Hardnessdefinition recall | 1 | 1 | Single correctRecall | – | |
| Non-Planar Structure of H2O2identify product then recall its dihedral angle | 1 | 1 | Single correctRecall | – | |
| Reducing Action on Metal Oxidesproduct of dihydrogen with metal oxide | 1 | 1 | Single correctRecall | – | |
| Calgon's Method for Permanent Hardnessstatement on calgon method | 1 | 1 | Single correctRecall | – | |
| Hydroformylation of Olefinshydroformylation product of 1-butene | 1 | 1 | Single correctApplication | – | |
| Metallic or Interstitialmetal forming interstitial hydride | 1 | 1 | Single correctRecall | – |
Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas
Every question
Hydrogen and Hydrides questions, year by year
The newest 40 show their opening words as they appeared in the official paper; older ones name the idea they tested. Open one for its options and the official answer.
JEE Main 202312 questions in 11 shifts
- 6 Apr, Shift 2Q65The product, which is not obtained during the electrolysis of brine solution is
Idea: Dihydrogen from Brine Electrolysis
Asked the year beforeEasySingle correct - 6 Apr, Shift 2Q88In an ice crystal, each water molecule is hydrogen bonded to ______________ neighbouring molecules.
Idea: Structure and Density of Ice
New ideaEasyNumerical value - 8 Apr, Shift 1Q66The water gas on reacting with cobalt as a catalyst forms
Idea: Syngas Production via Reforming
EasySingle correct - 8 Apr, Shift 2Q66Which of the following can reduce decomposition of on exposure to light
Idea: Storage and Stabilization of H2O2
Asked the year beforeMediumSingle correct - 10 Apr, Shift 1Q65Given below are two reactions, involved in the commercial production of dihydrogen (). The two reactions are carried out at…
Idea: Water-Gas Shift Reaction
EasySingle correct - 10 Apr, Shift 2Q66Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Physical properties of…
Idea: Isotopes of Hydrogen
Asked the year beforeEasyAssertion–reason - 11 Apr, Shift 1Q66Given below are two statements: Statement-I : Methane and steam passed over a heated Ni catalyst produces hydrogen gas. Statement-II :…
Idea: Syngas Production via Reforming
EasyTwo statements - 11 Apr, Shift 2Q66Which hydride among the following is less stable?
Idea: Polymeric s-Block Hydrides
New ideaEasySingle correct - 12 Apr, Shift 1Q67Match List I with List II LIST I (Type of Hydride) / LIST II (Example) A. Electron deficient hydride - I. B. Electron…
Idea: Covalent Hydride Types
Asked the year beforeEasyMatch the list - 13 Apr, Shift 1Q66Given below are two statements : Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening…
Idea: Ion-Exchange Resins for Water Softening
MediumTwo statements - 13 Apr, Shift 2Q66Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Isotopes of hydrogen…
Idea: Kinetic Isotope Effect in Hydrogen
MediumAssertion–reason - 15 Apr, Shift 1Q66During water-gas shift reaction
Idea: Water-Gas Shift Reaction
EasySingle correct
JEE Main 202218 questions in 17 shifts
- 25 Jul, Shift 2Q68High purity (>99.95%) dihydrogen is obtained by
Idea: High Purity Dihydrogen Preparation
EasySingle correct - 26 Jul, Shift 1Q65Which of the following can be used to prevent the decomposition of ?
Idea: Storage and Stabilization of H2O2
New ideaEasySingle correct - 26 Jul, Shift 2Q68The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are
Idea: Reducing Action of H2O2
Asked the year beforeEasySingle correct - 27 Jul, Shift 1Q68Given below are two statements. Statement I: Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions.…
Idea: Oxidizing Action of H2O2
Asked the year beforeMediumTwo statements - 28 Jul, Shift 1Q67The metal salts formed during softening of hardwater using Clark's method are :
Idea: Clark's Method for Temporary Hardness
New ideaEasySingle correct - 28 Jul, Shift 2Q34The products obtained during treatment of hard water using Clark's method are :
Idea: Temporary Hardness and Clark's Method
Asked the year beforeEasySingle correct - 28 Jul, Shift 2Q57On reaction with stronger oxidizing agent like , hydrogen peroxide oxidizes with the evolution of . The…
Idea: Redox Behavior of Hydrogen Peroxide
Asked the year beforeEasyNumerical value - 29 Jul, Shift 2Q67Given below are two statements. Statement I: Stannane is an example of a molecular hydride. Statement II: Stannane is a planar molecule.…
Idea: Covalent Hydride Types
New ideaEasyTwo statements - 30 Jul, Shift 2Q37The hardness of water is generally expressed in terms of equivalent. The possible reasons are as follows: (A) Its molar…
Idea: Causes of Temporary and Permanent Hardness
MediumOther - 24 Jun, Shift 2Q68In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct ?
Idea: Dihydrogen from Brine Electrolysis
New ideaEasySingle correct - 26 Jun, Shift 1Q68Consider the following reaction : The…
Idea: Non-Planar Structure of H2O2
New ideaMediumSingle correct - 26 Jun, Shift 2Q65Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen…
Idea: Temporary Hardness and Clark's Method
Asked the year beforeEasySingle correct - 27 Jun, Shift 1Q67Addition of to produces :
Idea: H2O2 Preparation from Barium Peroxide
Asked the year beforeEasySingle correct - 28 Jun, Shift 1Q65Dihydrogen reacts with CuO to give
Idea: Reducing Action on Metal Oxides
New ideaEasySingle correct - 28 Jun, Shift 2Q68Hydrogen has three isotopes : protium (H) , deuterium (H or D) and tritium (H or T) . They have nearly same chemical…
Idea: Isotopes of Hydrogen
Asked the year beforeEasySingle correct - 29 Jun, Shift 1Q68Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium ?
Idea: Redox Behavior of Hydrogen Peroxide
Asked the year beforeMediumSingle correct - 29 Jun, Shift 2Q68Given below are two statements. • Statement I: In , Cu-O bonds are present. • Statement II: In…
Idea: Classification of Hydrates
Asked the year beforeMediumTwo statements - 30 Jun, Shift 1Q68Match List - I with List - II : List - I (a) Sodium hydride (b) Silane (c) Vanadium hydride (d) Aluminium hydride List - II (i) Lewis acid…
Idea: Ionic or Saline Hydrides
Asked the year beforeMediumMatch the list
JEE Main 202126 questions in 22 shifts
- 3 Aug, Shift 2Q35Which one of the following statements is incorrect? A. The correct order of increasing first ionization enthalpy is Li < H < F. B. Out of…
Idea: Isotopes of Hydrogen
Asked the year beforeMediumOther - 4 Aug, Shift 1Q37Naturally occurring hydrogen contains three isotopes, protium (H), deuterium (D) and tritium (T). What is correct order of heat of…
Idea: H-H Bond Dissociation Enthalpy
New ideaEasySingle correct - 4 Aug, Shift 2Q34reacts with in basic medium to produce
Idea: Reducing Action of H2O2
New ideaMediumSingle correct - 26 Aug, Shift 1Q36Which one of the following methods is most suitable for preparing deionized water ?
Idea: Ion-Exchange Resins for Water Softening
New ideaEasySingle correct - 26 Aug, Shift 2Q36Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Heavy water is…
Idea: Kinetic Isotope Effect in Hydrogen
New ideaMediumAssertion–reason - 27 Aug, Shift 1Q37Deuterium resembles hydrogen in properties but :
Idea: Isotopes of Hydrogen
Asked the year beforeEasySingle correct - 27 Aug, Shift 2Q34The oxide that gives most readily on treatment with is :
Idea: H2O2 Preparation from Barium Peroxide
New ideaMediumSingle correct - 31 Aug, Shift 1Q37Given below are two statements : Statement I : The process of producing syn-gas is called gasification of coal. Statement II : The…
Idea: Syngas Production via Reforming
New ideaEasyTwo statements - 31 Aug, Shift 1Q58The number of hydrogen bonded water molecule(s) associated with stoichiometry is __________.
Idea: Classification of Hydrates
New ideaMediumNumerical value - 31 Aug, Shift 2Q34Which one of the following statements is incorrect ?
Idea: H-H Bond Dissociation Enthalpy
New ideaMediumSingle correct - 24 Feb, Shift 1 · Q35Redox Behavior of Hydrogen PeroxideNew ideaEasy
- 25 Feb, Shift 1 · Q36Oxidizing Action of H2O2New ideaEasy
- 25 Feb, Shift 2 · Q36Syngas Production via ReformingNew ideaEasy
- 25 Feb, Shift 2 · Q43Hydroformylation of OlefinsNew ideaEasy
- 26 Feb, Shift 1 · Q35Heavy Water PropertiesNew ideaEasy
- 26 Feb, Shift 2 · Q35Radioactive Decay of TritiumNew ideaEasy
- 26 Feb, Shift 2 · Q39Calgon's Method for Permanent HardnessNew ideaEasy
- 22 Jul, Shift 2 · Q36Radioactive Decay of TritiumNew ideaEasy
- 25 Jul, Shift 1 · Q35H-H Bond Dissociation EnthalpyNew ideaMedium
- 25 Jul, Shift 2 · Q36Metallic or InterstitialNew ideaEasy
- 16 Mar, Shift 2 · Q35Redox Behavior of Hydrogen PeroxideNew ideaMedium
- 16 Mar, Shift 2 · Q42Ionic or Saline HydridesNew ideaEasy
- 17 Mar, Shift 1 · Q35Heavy Water PropertiesNew ideaEasy
- 17 Mar, Shift 2 · Q36Ion-Exchange Resins for Water SofteningNew ideaEasy
- 18 Mar, Shift 1 · Q36Temporary Hardness and Clark's MethodNew ideaMedium
- 18 Mar, Shift 2 · Q36Oxidizing Action of H2O2New ideaMedium
JEE Main 20206 questions in 6 shifts
- 8 Jan, Shift 2 · Q34Isotopes of HydrogenNew ideaEasy
- 9 Jan, Shift 1 · Q49Causes of Temporary and Permanent HardnessNew ideaMedium
- 3 Sep, Shift 1 · Q49Volume Strength of H2O2New ideaMedium
- 3 Sep, Shift 2 · Q33Volume Strength of H2O2New ideaMedium
- 5 Sep, Shift 1 · Q35Water-Gas Shift ReactionNew ideaEasy
- 6 Sep, Shift 2 · Q34High Purity Dihydrogen PreparationNew ideaEasy
Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.
More topics in Hydrogen
This is the only topic tagged in this chapter.