JEE PYQ Hydrogen - Chapter-wise Questions with Solutions

About Hydrogen PYQs

Hydrogen has 107 previous year questions in the Quantrex Academy JEE Main & Advanced Chemistry bank. The 107 questions in this list come from JEE Main (95), Most Important Selected Qs for JEE Advanced (8) and JEE Advanced (4), spanning 2003 to 2026. Each question opens on its own page with the options, the correct answer and the worked solution where available.

JEE Hydrogen PYQs with Solutions

About Hydrogen PYQs

Questions by year (this list)

Hydrogen questions with solutions

The mass of iron converted into Fe_3O_4 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

During water-gas shift reaction

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

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

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

Which hydride among the following is less stable?

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.

Given below are two reactions, involved in the commercial production of dihydrogen ( H _ 2 ) . The two reactions are carried out at temperature &ldquo; T _ 1 &rdquo; and &ldquo; T

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

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 .

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 .

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

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

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

H _ 2 O _ 2 acts as a reducing agent in

The strength of 50 volume solution of hydrogen peroxide is _____ g / L (Nearest integer). Given: Molar mass of H _ 2 O _ 2 is 34g mol ^ - 1 Molar volume of gas at STP = 22 . 7L .

An indicator &lsquo; X &rsquo; 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

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

&#39; 25 volume&#39; hydrogen peroxide means

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

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 →

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

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

The products obtained during treatment of hard water using Clark&#39;s method are

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

The metal salts formed during softening of hardwater using Clark&#39;s method are

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

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

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

High purity (> 99 . 95 %) dihydrogen is obtained by

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

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

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

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

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

Hydrogen peroxide reacts with iodine in basic medium to give :

Which one of the following statements is incorrect ?

Monomer of Novolac is :

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

Deuterium resembles hydrogen in properties but:

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.

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

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

Which one of the following metals forms interstitial hydride easily ?

The single largest industrial application of dihydrogen is:

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 °

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

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

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

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

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

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

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

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

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

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

Water does not produce CO on reacting with :

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

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

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

Hydrogen peroxide, in the pure state, is :

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

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

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)

5g 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

The hardness of a water sample containing 10 ^ - 3 M MgSO _ 4 expressed as CaCO _ 3 equivalents (in ppm ) is . (molar mass of MgSO _ 4 is 120.37g / mol )

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) CaO + Si O _ 2 → CaSi O _ 3 (b) 3F e _ 2 O _ 3

Among statements (a) - (d), the correct ones are: (a) Decomposition of hydrogen peroxide gives di-oxygen. (b) Like hydrogen peroxide, compounds, such as KCl O _ 3 , Pb (N O _ 3 )

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

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:

The correct statements among (a) to (d) are: (a) Saline hydrides produce H _ 2 gas when reacted with H _ 2 O . (b) Reaction of LiAl H _ 4 with B F _ 3 leads to B _ 2 H _ 6 . (c) P

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

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

100mL of a water sample contains 0.81g of calcium bicarbonate and 0.73 g of magnesium bicarbonate. The hardness of this water sample expressed in terms of equivalents of CaC O _ 3

The volume strength of 1M H _ 2 O _ 2 is: (Molar mass of H _ 2 O _ 2 = 34gmol ^ - 1 )

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 = 136g mol ^ - 1 )

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

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

' 25 volume' hydrogen peroxide means

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

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