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Hydrogen — JEE Main & Advanced Chemistry PYQs

107 previous year questions from Hydrogen with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

107 questionsChemistrySolutions on every page
1

The mass of iron converted into Fe₃O₄ by the action of 18 g of steam is : (Given : Molar mass of H, O and Fe are 1 , 16 and 56 g mol ⁻¹ respectively) Assume iron is present in exce

JEE Main 2026 Solution View → 2

During water-gas shift reaction

JEE Main 2023 Solution View → 3

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Isotopes of hydrogen have almost same chemical properties, but d

JEE Main 2023 Solution View → 4

Given below are two statements: Statement I: Permutit process is more efficient compared to the synthetic resin method for the softening of water. Statement II: Synthetic resin met

JEE Main 2023 Solution View → 5

Match 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 Electron precise hydride III B 2 H 6 D Saline

JEE Main 2023 Solution View → 6

Which hydride among the following is less stable?

JEE Main 2023 Solution View → 7

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Physical properties of isotopes of hydrogen are different. Reas

JEE Main 2023 Solution View → 8

Given below are two reactions, involved in the commercial production of dihydrogen H 2 . The two reactions are carried out at temperature “ T 1 ” and “ T 2 &rdquo

JEE Main 2023 Solution View → 9

Which of the following can reduce decomposition of H 2 O 2 on exposure to light

JEE Main 2023 Solution View → 10

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Loss of electron from hydrogen atom results in nucleus of ~ 1 . 5

JEE Main 2023 Solution View → 11

O - 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 in F 2 O 2 . Choose the co

JEE Main 2023 Solution View → 12

The starting material for convenient preparation of deuterated hydrogen peroxide D 2 O 2 in laboratory is:

JEE Main 2023 Solution View → 13

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Hydrogen is an environment friendly fuel. Reason R: Atomic number

JEE Main 2023 Solution View → 14

Given 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 restoration of aerobic conditions to sewage

JEE Main 2023 Solution View → 15

H 2 O 2 acts as a reducing agent in

JEE Main 2023 Solution View → 16

The 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 Molar volume of gas at STP = 22 . 7 L .

JEE Main 2023 Solution View → 17

An 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 at room temp. The indicato

JEE Main 2023 Solution View → 18

Which of the given compounds can enhance the efficiency of hydrogen storage tank?

JEE Main 2023 Solution View → 19

' 25 volume' hydrogen peroxide means

JEE Main 2023 Solution View → 20

In which of the following reactions the hydrogen peroxide acts as a reducing agent?

JEE Main 2023 Solution View → 21

LIST- I contains compounds and LIST- II contains reactions LIST- I LIST- II I H 2 O 2 P Mg HCO 3 2 + Ca OH 2 → II Mg OH 2 Q BaO 2 + H 2 SO 4 → III BaCl 2 R Ca OH 2 2 +

JEE Advanced 2022 Solution View → 22

Given below are two statements. Statement I : Stannane is an example of a molecular hydride. Statement II : Stannane is a planar molecule. In the light of the above statement, choo

JEE Main 2022 Solution View → 23

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives

JEE Main 2022 Solution View → 24

The products obtained during treatment of hard water using Clark's method are

JEE Main 2022 Solution View → 25

On reaction with stronger oxidizing agent like KIO 4 , hydrogen peroxide oxidizes with the evolution of O 2 . The oxidation number of I in KIO 4 changes to

JEE Main 2022 Solution View → 26

The metal salts formed during softening of hardwater using Clark's method are

JEE Main 2022 Solution View → 27

For kinetic study of the reaction of iodide ion with H 2 O 2 at room temperature : (A) Always use freshly prepared starch solution. (B) Always keep the concentration of sodium thio

JEE Main 2022 Solution View → 28

Given below are two statements: Statement I : Hydrogen peroxide can act as an oxidizing agent in both acidic and basic conditions. Statement II: Density of hydrogen peroxide at 298

JEE Main 2022 Solution View → 29

Which of the following can be used to prevent the decomposition of H 2 O 2 ?

JEE Main 2022 Solution View → 30

High purity > 99 . 95 % dihydrogen is obtained by

JEE Main 2022 Solution View → 31

The reaction of H 2 O 2 with potassium permanganate in acidic medium leads to the formation of mainly

JEE Main 2022 Solution View → 32

Which one of the following reactions indicates the reducing ability of hydrogen peroxide in basic medium?

JEE Main 2022 Solution View → 33

Hydrogen has three isotopes : protium H 1 , deuterium ( H 2 or D ) and tritium ( H 3 or T ). They have nearly same chemical properties but different physical properties. They diffe

JEE Main 2022 Solution View → 34

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

JEE Main 2022 Solution View → 35

The highest industrial consumption of molecular hydrogen is to produce compound of element :

JEE Main 2022 Solution View → 36

Hydrogen peroxide reacts with iodine in basic medium to give :

JEE Main 2021 Solution View → 37

Which one of the following statements is incorrect ?

JEE Main 2021 Solution View → 38

Monomer of Novolac is :

JEE Main 2021 Solution View → 39

The number of hydrogen bonded water molecule(s) associated with stoichiometry CuSO 4 · 5 H 2 O is __________ .

JEE Main 2021 Solution View → 40

Deuterium resembles hydrogen in properties but:

JEE Main 2021 Solution View → 41

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Heavy water is used for the study of reaction mechanism.

JEE Main 2021 Solution View → 42

Which one of the following methods is most suitable for preparing deionized water?

JEE Main 2021 Solution View → 43

The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :-

JEE Main 2021 Solution View → 44

Which one of the following metals forms interstitial hydride easily ?

JEE Main 2021 Solution View → 45

The single largest industrial application of dihydrogen is:

JEE Main 2021 Solution View → 46

Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R . Assertion A : The dihedral angles in H 2 O 2 in gaseous phase is 90 . 2 ° a

JEE Main 2021 Solution View → 47

In 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 appropriate answer from the

JEE Main 2021 Solution View → 48

Given below are two statements: One is labelled as Assertion A and the other labelled as reason R Assertion A : During the boiling of water having temporary hardness, Mg HCO 3 2 is

JEE Main 2021 Solution View → 49

The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are :

JEE Main 2021 Solution View → 50

The INCORRECT statement(s) about heavy water is (are) (A) used as a moderator in nuclear reactor (B) obtained as a by-product in fertilizer industry. (C) used for the study of reac

JEE Main 2021 Solution View → 51

The correct statements about H 2 O 2 are : (A) used in the treatment of effluents. (B) used as both oxidising and reducing agents. (C) the two hydroxyl groups lie in the same plane

JEE Main 2021 Solution View → 52

Given 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 hydrogen economy, the energy is transmitte

JEE Main 2021 Solution View → 53

A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is :

JEE Main 2021 Solution View → 54

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

JEE Main 2021 Solution View → 55

Which of the following forms of hydrogen emits low energy β - particles?

JEE Main 2021 Solution View → 56

Statements about heavy water are given below. A. Heavy water is used in exchange reactions for the study of reaction mechanisms. B. Heavy water is prepared by exhaustive electrolys

JEE Main 2021 Solution View → 57

Water does not produce CO on reacting with :

JEE Main 2021 Solution View → 58

Which of the following equation depicts the oxidizing nature of H 2 O 2 ?

JEE Main 2021 Solution View → 59

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Hydrogen is the most abundant element in the Universe, but it is

JEE Main 2021 Solution View → 60

Dihydrogen of high purity > 99 . 95 % is obtained through :

JEE Main 2020 Solution View → 61

Hydrogen peroxide, in the pure state, is :

JEE Main 2020 Solution View → 62

The one that is NOT suitable for the removal of permanent hardness of water is :

JEE Main 2020 Solution View → 63

The equation that represents the water-gas shift reaction is :

JEE Main 2020 Solution View → 64

Consider the following equations : 2 Fe 2 + + H 2 O 2 → xA + yB (in basic medium) 2 MnO 4 - + 6 H + + 5 H 2 O 2 → x ' C + y ' D + z ' E (in acidic medium) T

JEE Main 2020 Solution View → 65

5 g of zinc is treated separately with an excess of ( a ) dilute hydrochloric acid and ( b ) aqueous sodium hydroxide. The ratio of the volumes of H 2 evolved in these two reaction

JEE Main 2020 Solution View → 66

The hardness of a water sample containing 10 - 3 M M g S O 4 expressed as C a C O 3 equivalents (in p p m ) is . (molar mass of M g S O 4 is 120.37 g / m o l )

JEE Main 2020 Solution View → 67

Among the reactions a - d , the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are: a C a O + S i O 2 → C a S i O 3 b 3 F e 2 O 3 +

JEE Main 2020 Solution View → 68

Among statements a - d , the correct ones are: a Decomposition of hydrogen peroxide gives di-oxygen. b Like hydrogen peroxide, compounds, such as K C l O 3 , P b N O 3 and N a N O

JEE Main 2020 Solution View → 69

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resin method is

JEE Main 2020 Solution View → 70

The temporary hardness of a water sample is due to compound X . Boiling this sample converts X to compound Y . X and Y , respectively, are:

JEE Main 2019 Solution View → 71

The correct statements among a to d are: a Saline hydrides produce H 2 gas when reacted with H 2 O . b Reaction of L i A l H 4 with B F 3 leads to B 2 H 6 . c P H 3 and C H 4 are e

JEE Main 2019 Solution View → 72

The synonym for water gas when used in the production of methanol is:

JEE Main 2019 Solution View → 73

The strength of 11.2 volume solution of H 2 O 2 is [Given that, the molar mass of H = 1 g m o l - 1 and O = 16 g m o l - 1 ]

JEE Main 2019 Solution View → 74

100 m L of a water sample contains 0.81 g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of C a C O

JEE Main 2019 Solution View → 75

The volume strength of 1 M   H 2 O 2 is: (Molar mass of H 2 O 2 = 34   g   mol - 1 )

JEE Main 2019 Solution View → 76

What is the hardness of a water sample ( in terms of equivalents of CaCO 3 ) containing 10 - 3 M   CaSO 4 ? ( Molar mass of CaSO 4 = 136   g    mol - 1 )

JEE Main 2019 Solution View → 77

The correct statements among (a) to (d) regarding H ₂ as a fuel are : (i) It produces less pollutants than petrol. (ii) A cylinder of compressed dihydrogen weighs 30 times more tha

JEE Main 2019 Solution View → 78

NaH is an example of:

JEE Main 2019 Solution View → 79

The chemical nature of hydrogen peroxide is:

JEE Main 2019 Solution View → 80

The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are

JEE Main 2019 Solution View → 81

The temporary hardness of water is due to:

JEE Main 2019 Solution View → 82

The isotopes of hydrogen are:

JEE Main 2019 Solution View → 83

Hydrogen peroxide oxidises Fe CN 6 4 - to Fe CN 6 3 - in acidic medium, but reduces Fe CN 6 3 - to Fe CN 6 4 - in alkaline medium. The other products formed are, respectively

JEE Main 2018 Solution View → 84

Which of the following combinations will produce H 2 gas?

JEE Advanced 2017 Solution View → 85

In which of the following reactions, hydrogen peroxide acts as an oxidizing agent?

JEE Main 2017 Solution View → 86

Identify the incorrect statement regarding heavy water:

JEE Main 2016 Solution View → 87

Which of the following statements about water is FALSE?

JEE Main 2016 Solution View → 88

Which physical property of di-hydrogen is wrong?

JEE Main 2015 Solution View → 89

Permanent hardness in water cannot be cured by:

JEE Main 2015 Solution View → 90

From the following statements, choose the incorrect statement regarding H 2 O 2 .

JEE Main 2015 Solution View → 91

Hydrogen peroxide in its reaction with KIO 4 and NH 2 OH respectively, is acting as a

JEE Advanced 2014 Solution View → 92

Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases H ₂ O ₂ acts as a reducing ag

JEE Main 2014 Solution View → 93

In which of the following reactions H 2 O 2 acts as a reducing agent ? (a)   H 2 O 2 + 2 H + + 2 e - → 2 H 2 O (b)   H 2 O 2 - 2 e - → O 2 + 2 H + (

JEE Main 2014 Solution View → 94

The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively :

JEE Main 2013 Solution View → 95

Very pure hydrogen (99.9 %) can be made by which of the following processes?

JEE Main 2012 Solution View → 96

The reagent(s) used for softening the temporary hardness of water is(are)

JEE Advanced 2010 Solution View → 97

In context with the industrial preparation of hydrogen from water gas ( CO + H ₂ ) , which of the following is the correct statement?

JEE Main 2008 Solution View → 98

Hydrogen bomb is based on the principle of

JEE Main 2005 Solution View → 99

Which one of the following processes will produce hard water?

JEE Main 2003 Solution View → 100

For decolourisation of 1 mole of KMnO ₄ , the moles of H ₂ O ₂ required is

Most Important Selected Qs for JEE Advanced Solution View → 101

What is the boiling point of heavy water?

Most Important Selected Qs for JEE Advanced Solution View → 102

Ice floats on water because:

Most Important Selected Qs for JEE Advanced Solution View → 103

Which of the following statements is incorrect for H ₂ O ₂ structure?

Most Important Selected Qs for JEE Advanced Solution View → 104

Which of the following compounds is NOT present in it's standard state at 25^ C and 1 atmosphere pressure?

Most Important Selected Qs for JEE Advanced Solution View → 105

An aqueous solution of X on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, X can be

Most Important Selected Qs for JEE Advanced Solution View → 106

A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B), which when passed through an alkaline solution of potassium mercuric iodide gave brown ppt. The

Most Important Selected Qs for JEE Advanced Solution View → 107

Which of the following is not a property of hydrogen peroxide?

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