How many questions from Hydrogen appear in JEE?

Hydrogen has appeared in 81 of the last 186 JEE Main and JEE Advanced papers — about 44% of them — contributing 87 questions in total across those papers.

Is Hydrogen an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 44% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.

Where do these Hydrogen questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.

Hydrogen JEE Previous Year Questions with Answers

Q1·ChemistrySingle correctJEE Main 2023

During water-gas shift reaction

(A)carbon monoxide is oxidized to carbon dioxide.
(B)carbon is oxidized to carbon monoxide.
(C)carbon dioxide is reduced to carbon monoxide.
(D)water is evaporated in presence of catalyst.

Q2·ChemistrySingle correctJEE Main 2023

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 method results in the formation of soluble sodium salts. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both the Statements I and II are correct
(B)Statement I is correct but Statement II is incorrect
(C)Statement I is incorrect but Statement II is correct
(D)Both the Statements I and II are incorrect

Q3·ChemistrySingle correctJEE Main 2023

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 difference in their rates of reaction. Reason R: Isotopes of hydrogen have different enthalpy of bond dissociation. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both A and R are correct but R is NOT the correct explanation of A
(B)Both A and R are correct and R is the correct explanation of A
(C)A is not correct but R is correct
(D)A is correct but R is not correct

Q4·ChemistrySingle correctJEE Main 2023

Match List I (type of hydride) with List II (example). Choose the correct answer from the options given below:

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 hydride	IV.CH $_4$

(A)A-III, B-II, C-IV, D-I
(B)A-II, B-III, C-IV, D-I
(C)A-II, B-III, C-I, D-IV
(D)A-III, B-II, C-I, D-IV

Q5·ChemistrySingle correctJEE Main 2023

Which hydride among the following is less stable?

(A) $BeH_2$
(B) $NH_3$
(C) $HF$
(D) $LiH$

Q6·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement-I: Methane and steam passed over a heated Ni catalyst produces hydrogen gas. Statement-II: Sodium nitrite reacts with

NH_4Cl

to give

H_2O

,

N_2

and

NaCl

. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both the statements I and II are correct
(B)Both the statements I and II are incorrect
(C)Statement I is incorrect but Statement II is correct
(D)Statement I is correct but Statement II is incorrect

Q7·ChemistrySingle correctJEE Main 2023

Given below are two reactions involved in the commercial production of dihydrogen (H

_2

), carried out at temperatures

T_1

and

T_2

respectively:

C(s)+H_2O(g)\xrightarrow{T_1}CO(g)+H_2(g)

and

CO(g)+H_2O(g)\xrightarrow{T_2}CO_2(g)+H_2(g)

. The temperatures

T_1

and

T_2

are correctly related as

(A) $T_1>T_2$
(B) $T_1=T_2$
(C) $T_1=100$ K, $T_2=1270$ K
(D) $T_1<T_2$

Q8·ChemistryAssertion & ReasonJEE Main 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Physical properties of the isotopes of hydrogen are different. Reason R: The mass difference between the isotopes of hydrogen is very large. In the light of the above statements, choose the correct answer from the options given below:

(A)A is false but R is true.
(B)Both A and R are true but R is NOT the correct explanation of A.
(C)A is true but R is false.
(D)Both A and R are true and R is the correct explanation of A.

Q9·ChemistrySingle correctJEE Main 2023

Which of the following can reduce the decomposition of

H_2O_2

on exposure to light?

(A)Alkali
(B)Urea
(C)Dust
(D)Glass containers

Q10·ChemistrySingle correctJEE Main 2023

The water gas on reacting with cobalt as a catalyst forms

(A)Ethanol
(B)Methanoic acid
(C)Methanal
(D)Methanol

Q11·ChemistrySingle correctJEE Main 2023

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

\sim 1.5\times10^{-3}

pm size. Reason R: Proton

(H^{+})

always exists in combined form. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both A and R are correct and R is the correct explanation of A
(B)A is correct but R is not correct
(C)A is not correct but R is correct
(D)Both A and R are correct but R is NOT the correct explanation of A

Q12·ChemistrySingle correctJEE Main 2023

The starting material for convenient preparation of deuterated hydrogen peroxide (

D_2O_2

) in laboratory is:

(A)BaO
(B) $K_2S_2O_8$
(C) $BaO_2$
(D)2-ethylanthraquinol

Q13·ChemistryAssertion & ReasonJEE Main 2023

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 of hydrogen is 1 and it is a very light element. In the light of the above statements, choose the correct answer from the options given below:

(A)A is true but R is false
(B)A is false but R is true
(C)Both A and R are true and R is the correct explanation of A
(D)Both A and R are true but R is NOT the correct explanation of A

Q14·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I:

H_2O_2

is used in the synthesis of Cephalosporin. Statement II:

H_2O_2

is used for the restoration of aerobic conditions to sewage wastes. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and Statement II are correct
(B)Statement I is incorrect but Statement II is correct
(C)Statement I is correct but Statement II is incorrect
(D)Both Statement I and Statement II are incorrect

Q15·ChemistrySingle correctJEE Main 2023

H_2O_2

acts as a reducing agent in

(A) $2NaOCl + H_2O_2 \rightarrow 2NaCl + H_2O + O_2$
(B) $Na_2S + 4H_2O_2 \rightarrow Na_2SO_4 + 4H_2O$
(C) $2Fe^{2+} + 2H^+ + H_2O_2 \rightarrow 2Fe^{3+} + 2H_2O$
(D) $Mn^{2+} + 2H_2O_2 \rightarrow MnO_2 + 2H_2O$

Q16·ChemistrySingle correctJEE Main 2023

Lithium aluminium hydride can be prepared from the reaction of

(A)LiH and Al(OH) $_3$
(B)LiH and Al $_2$ Cl $_6$
(C)LiCl and Al $_2$ H $_6$
(D)LiCl, Al and H $_2$

Q17·ChemistryNumericalJEE Main 2023

The strength of a 50 volume solution of hydrogen peroxide is _______ g/L (nearest integer). (Given: molar mass of

H_2O_2

is 34 g mol

^{-1}

; molar volume of gas at STP = 22.7 L)

Q18·ChemistrySingle correctJEE Main 2023

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

(A)Di-isobutylaluminium hydride
(B)NaNi $_5$
(C)Li/P $_4$
(D)SiH $_4$

Q19·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I: Nickel is being used as the catalyst for producing syn gas and edible fats. Statement II: Silicon forms both electron rich and electron deficient hydrides. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Statement I is correct but statement II is incorrect
(B)Both the statements I and II are correct
(C)Statement I is incorrect but statement II is correct
(D)Both the statements I and II are incorrect

Q20·ChemistrySingle correctJEE Main 2023

'25 volume' hydrogen peroxide means:

(A)1 L marketed solution contains 25 g of $H_2O_2$ .
(B)1 L marketed solution contains 75 g of $H_2O_2$ .
(C)1 L marketed solution contains 250 g of $H_2O_2$ .
(D)100 mL marketed solution contains 25 g of $H_2O_2$ .

Q21·ChemistrySingle correctJEE Main 2023

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

(A) $PbS+4H_2O_2\rightarrow PbSO_4+4H_2O$
(B) $Mn^{2+}+H_2O_2\rightarrow Mn^{4+}+2OH^-$
(C) $HOCl+H_2O_2\rightarrow H_3O^++Cl^-+O_2$
(D) $2Fe^{2+}+H_2O_2\rightarrow 2Fe^{3+}+2OH^-$

Q22·ChemistrySingle correctJEE Main 2022

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, choose the most appropriate answer from the options given below :

(A)Both Statement I and Statement II are true.
(B)Both Statement I and Statement II are false.
(C)Statement I is true but Statement II is false.
(D)Statement I is false but Statement II is true.

Q23·ChemistrySingle correctJEE Main 2022

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

(A) $\mathrm{CaCO_3}$ and $\mathrm{MgCO_3}$
(B) $\mathrm{Ca(OH)_2}$ and $\mathrm{Mg(OH)_2}$
(C) $\mathrm{CaCO_3}$ and $\mathrm{Mg(OH)_2}$
(D) $\mathrm{Ca(OH)_2}$ and $\mathrm{MgCO_3}$

Q24·ChemistrySingle correctJEE Main 2022

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

(A)Ca(OH) $_2$ and Mg(OH) $_2$
(B)CaCO $_3$ and Mg(OH) $_2$
(C)Ca(OH) $_2$ and MgCO $_3$
(D)CaCO $_3$ and MgCO $_3$

Q25·ChemistrySingle correctJEE Main 2022

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 K is lower than that of

D_{2}O

. In the light of the above statements. Choose the correct answer from the options.

(A)Both statement I and Statement II are ture
(B)Both statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q26·ChemistrySingle correctJEE Main 2022

Which of the following can be used to prevent the decomposition of H

_2

O

_2

?

(A)Urea
(B)Formaldehyde
(C)Formic acid
(D)Ethanol

Q27·ChemistrySingle correctJEE Main 2022

The products obtained from a reaction of hydrogen peroxide and acidified potassium permanganate are

(A) $Mn^{4+}$ , $H_{2}O$ only
(B) $Mn^{2+}$ , $H_{2}O$ only
(C) $Mn^{4+}$ , $H_{2}O$ , $O_{2}$ only
(D) $Mn^{2+}$ , $H_{2}O$ , $O_{2}$ only

Q28·ChemistrySingle correctJEE Main 2022

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

(A) $HOCl + H_2O_2 \rightarrow H_3O^+ + Cl^- + O_2$
(B) $PbS + 4H_2O_2 \rightarrow PbSO_4 + 4H_2O$
(C) $2MnO_4^- + 3H_2O_2 \rightarrow 2MnO_2 + 3O_2 + 2H_2O + 2OH^-$
(D) $Mn^{2+} + H_2O_2 \rightarrow Mn^{4+} + 2OH^-$

Q29·ChemistrySingle correctJEE Main 2022

Hydrogen has three isotopes : protium (

^1

H), deuterium (

^2

H or D) and tritium (

^3

H or T). They have nearly same chemical properties but different physical properties. They differ in

(A)number of protons
(B)atomic number
(C)electronic configuration
(D)atomic mass

Q30·ChemistrySingle correctJEE Main 2022

Dihydrogen reacts with CuO to give

(A) $CuH_2$
(B)Cu
(C) $Cu_2O$
(D) $Cu(OH)_2$

Q31·ChemistrySingle correctJEE Main 2022

Addition of

H_{2}SO_{4}

to

BaO_{2}

produces:

(A)BaO, $SO_{2}$ and $H_{2}O$
(B) $BaHSO_{4}$ and $O_{2}$
(C) $BaSO_{4}$ , $H_{2}$ and $O_{2}$
(D) $BaSO_{4}$ and $H_{2}O_{2}$

Q32·ChemistrySingle correctJEE Main 2022

Consider the following reaction :

2HSO_{4}^{-}(aq) \xrightarrow{(1)\ Electrolysis\ (2)\ Hydrolysis} 2HSO_{4}^{-} + 2H^{+} + A

The dihedral angle in product A in its solid phase at 110 K is :

(A)104°
(B)111.5°
(C)90.2°
(D)111.0°

Q33·ChemistrySingle correctJEE Main 2022

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

(A)Carbon
(B)Nitrogen
(C)Oxygen
(D)Chlorine

Q34·ChemistrySingle correctJEE Main 2022

In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

(A)NaOH
(B)NaCl
(C)Na metal
(D)Na $_2$ CO $_3$

Q35·ChemistrySingle correctJEE Main 2021

Hydrogen peroxide reacts with iodine in basic medium to give :

(A)IO $_{4}^{-}$
(B)IO $^{-}$
(C)I $^{-}$
(D)IO $_{3}^{-}$

Q36·ChemistrySingle correctJEE Main 2021

Which one of the following statements is incorrect ?

(A)Atomic hydrogen is produced when $\mathrm{H_2}$ molecules at a high temperature are irradiated with UV radiation.
(B)At around 2000 K, the dissociation of dihydrogen into its atoms is nearly 8.1%.
(C)Bond dissociation enthalpy of $\mathrm{H_2}$ is highest among diatomic gaseous molecules which contain a single bond .
(D)Dihydrogen is produced on reacting zinc with HCl as well as $\mathrm{NaOH_{(aq)}}$ .

Q37·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement-I : The process of producing syn-gas is called gasification of coal. Statement-II : The composition of syn-gas is

\mathrm{CO} + \mathrm{CO_2} + \mathrm{H_2}

(1 : 1 : 1) In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Statement-I is false but Statement-II is true
(B)Statement-I is true but Statement-II is false
(C)Both Statement-I and Statement-II are false
(D)Both Statement-I and Statement-II are true

Q38·ChemistryNumericalJEE Main 2021

The number of hydrogen bonded water molecule(s) associated with stoichiometry

\mathrm{CuSO_4.5H_2O}

is ____.

Q39·ChemistrySingle correctJEE Main 2021

The oxide that gives H

_{2}

O

_{2}

most readily on treatment with H

_{2}

O is :

(A)PbO $_{2}$
(B)Na $_{2}$ O $_{2}$
(C)SnO $_{2}$
(D)BaO $_{2}$ ·8H $_{2}$ O

Q40·ChemistrySingle correctJEE Main 2021

Deuterium resembles hydrogen in properties but :

(A)reacts slower than hydrogen
(B)reacts vigorously than hydrogen
(C)reacts just as hydrogen
(D)emits $\beta^+$ particles

Q41·ChemistrySingle correctJEE Main 2021

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. Reason (R) : The rate of reaction for the cleavage of O - H bond is slower than that of O-D bond. Choose the most appropriate answer from the options given below :

(A)Both (A) and (R) are true but (R) is not the true explanation of (A).
(B)Both (A) and (R) are true and (R) is the true explanation of (A).
(C)(A) is false but (R) is true.
(D)(A) is true but (R) is false.

Q42·ChemistrySingle correctJEE Main 2021

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

(A)Synthetic resin method
(B)Clark's method
(C)Calgon's method
(D)Permutit method

Q43·ChemistrySingle correctJEE Main 2021

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

(A)2 and 1
(B)1 and 1
(C)3 and 1
(D)2 and 2

Q44·ChemistrySingle correctJEE Main 2021

At 298.2 K the relationship between enthalpy of bond dissociation ( in kJ mol

^{-1}

) for hydrogen (

E_H

) and its isotope, deuterium (

E_D

), is best described by:

(A) $E_H = E_D$
(B) $E_H = \frac{1}{2}E_D$
(C) $E_H = 2E_D$
(D) $E_H \cong E_D - 7.5$

Q45·ChemistrySingle correctJEE Main 2021

Isotope(s) of hydrogen which emits low energy

\beta^-

particles with

t_{\frac{1}{2}}

value > 12 years is / are:

(A)Protium
(B)Tritium
(C)Deuterium
(D)Deuterium and Tritium

Q46·ChemistrySingle correctJEE Main 2021

The water having more dissolved

O_{2}

is :

(A)Water at 80° C
(B)boiling water
(C)polluted water
(D)water at 4° C

Q47·ChemistrySingle correctJEE Main 2021

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The dihedral angles in

H_2O_2

in gaseous phase is 90.2° and in solid phase is 111.5°. Reason R: The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces. Choose the most appropriate answer from the options given below for A and R.

(A)A is correct but R is not correct.
(B)Both A and R are correct but R is not the correct explanation of A.
(C)Both A and R are correct and R is the correct explanation of A
(D)A is not correct but R is correct.

Q48·ChemistrySingle correctJEE Main 2021

The single largest industrial application of dihydrogen is :

(A)Rocket fuel in space research
(B)In the synthesis of nitric acid
(C)In the synthesis of ammonia
(D)Manufacture of metal hydrides

Q49·ChemistrySingle correctJEE Main 2021

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 options given below :

(A)(A), (C) only
(B)(A) only
(C)(B) only
(D)(A), (B) only

Q50·ChemistrySingle correctJEE Main 2021

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 reaction mechanism (D) has a higher dielectric constant than water Choose the correct answer from the options given below :

(A)(B) only
(B)(C) only
(C)(D) only
(D)(B) and (D) only

Q51·ChemistrySingle correctJEE Main 2021

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

(A)–SO $_{3}$ H and –NH $_{2}$
(B)–SO $_{3}$ H and –COOH
(C)–NH $_{2}$ and –COOH
(D)–NH $_{2}$ and –SO $_{3}$ H

Q52·ChemistrySingle correctJEE Main 2021

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. (D) miscible with water. Choose the correct answer from the options given below :

(A)(A), (B), (C) and (D)
(B)(A), (B) and (D) only
(C)(B), (C) and (D) only
(D)(A), (C) and (D) only

Q53·ChemistrySingle correctJEE Main 2021

Statement I : Sodium hydride can be used as an oxidising agent. Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below :

(A)Both statement I and statement II are false
(B)Statement I is true but statement II is false
(C)Statement I is false but statement II is true
(D)Both statement I and statement II are true

Q54·ChemistrySingle correctJEE Main 2021

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 transmitted in the form of dihydrogen. In the light of the above statements, choose the correct answer from the options given below :

(A)Both statement I and statement II are false
(B)Both statement I and statement II are true
(C)Statement I is true but statement II is false
(D)Statement I is false but statement II is true

Q55·ChemistrySingle correctJEE Main 2021

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

(A)Calgon contains the 2 $^{nd}$ most abundant element by weight in the earth's crust.
(B)It is also known as Graham's salt.
(C)It is polymeric compound and is water soluble.
(D)It doesnot remove Ca $^{2+}$ ion by precipitation.

Q56·ChemistrySingle correctJEE Main 2021

Which of the following forms of hydrogen emits low energy

\beta^-

particles?

(A)Proton $H^+$
(B)Deuterium $_1^2H$
(C)Protium $_1^1H$
(D)Tritium $_1^3H$

Q57·ChemistrySingle correctJEE Main 2021

Statement 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 electrolysis of water C. Heavy water has higher boiling point than ordinary water D. Viscosity of H

_2

O is greater than D

_2

O

(A)A and B only
(B)A and D only
(C)A, B and C only
(D)A and C only

Q58·ChemistrySingle correctJEE Main 2021

Water does not produce CO on reacting with :

(A)C3H8
(B)C
(C)CH4
(D)CO2

Q59·ChemistrySingle correctJEE Main 2021

Which of the following equation depicts the oxidizing nature of H

_{2}

O

_{2}

?

(A)Cl $_{2}$ + H $_{2}$ O $_{2}$ → 2HCl + O $_{2}$
(B)KIO $_{4}$ + H $_{2}$ O $_{2}$ → KIO $_{3}$ + H $_{2}$ O + O $_{2}$
(C)2I $^{-}$ + H $_{2}$ O $_{2}$ + 2H $^{+}$ → I $_{2}$ + 2H $_{2}$ O
(D)I $_{2}$ + H $_{2}$ O $_{2}$ + 2OH $^{-}$ → 2I $^{-}$ + 2H2O + O $_{2}$

Q60·ChemistrySingle correctJEE Main 2021

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 not the most abundant gas in the troposphere. Reason R : Hydrogen is the lightest element. In the light of the above statements, choose the correct answer from the given below

(A)A is false but R is true
(B)Both A and R are true and R is the correct explanation of A
(C)A is true but R is false
(D)Both A and R are true but R is NOT the correct explanation of A

Q61·ChemistrySingle correctJEE Main 2021

(A)

\mathrm{HOCl + H_2O_2 \rightarrow H_3O^{+} + Cl^{-} + O_2}

(B)

\mathrm{I_2 + H_2O_2 + 2OH^{-} \rightarrow 2I^{-} + 2H_2O + O_2}

Choose the correct option.

(A) $\mathrm{H_2O_2}$ act as oxidizing and reducing agent respectively in equations (A) and (B).
(B) $\mathrm{H_2O_2}$ acts as oxidizing agent in equations (A) and (B).
(C) $\mathrm{H_2O_2}$ acts as reducing agent in equations (A) and (B).
(D) $\mathrm{H_2O_2}$ acts as reducing and oxidising agent respectively in equation (A) and (B).

Q62·ChemistrySingle correctJEE Main 2020

Dihydrogen of high purity (>99.95%) is obtained through:

(A)the reaction of Zn with dilute HCl.
(B)the electrolysis of acidified water using Pt electrodes
(C)the electrolysis of brine solution.
(D)the electrolysis of warm Ba(OH) $_2$ solution using Ni electrodes.

Q63·ChemistrySingle correctJEE Main 2020

Hydrogen peroxide, in the pure state, is:

(A)non-planar and blue in color
(B)planar and blue in color
(C)linear and blue in color
(D)linear and almost colorless

Q64·ChemistrySingle correctJEE Main 2020

The equation that represents the water – gas shift reactions is:

(A) $CO(g) + H_2O(g) \xrightarrow[\text{Catalyst}]{673\,K} CO_2(g) + H_2(g)$
(B) $C(s) + H_2O(g) \xrightarrow{1270\,K} CO(g) + H_2(g)$
(C) $2C(s) + O_2(g) + 4N_2(g) \xrightarrow{1273\,K} 2CO(g) + 4N_2(g)$
(D) $CH_4(g) + H_2O(g) \xrightarrow[\text{Ni}]{1270\,K} CO(g) + 3H_2(g)$

Q65·ChemistrySingle correctJEE Main 2020

The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)

(A)0.85 and 0.25
(B)0.85 and 0.5
(C)1.7 and 0.5
(D)1.7 and 0.25

Q66·ChemistryNumericalJEE Main 2020

The volume strength of 8.9 M H

_2

O

_2

solution calculated at 273 K and 1 atm is __________. (R = 0.0821 L atm K

^{-1}

mol

^{-1}

) (rounded off to the nearest integer)

Q67·ChemistryNumericalJEE Main 2020

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 120.38 g/mol)

Q68·ChemistrySingle correctJEE Main 2020

Hydrogen has three isotopes (a), (b) and (c). If the number of neutron(s) in (a), (b) and (c) respectively, are (x), (y) and (z), the sum of (x), (y) and (z) is:

(A)4
(B)3
(C)2
(D)1

Q69·ChemistrySingle correctJEE Main 2020

Among statements (a) - (d), the correct ones are (a) decomposition of hydrogen peroxide gives dioxygen. (b) like hydrogen peroxide, compounds such as

KClO_3

,

Pb(NO_3)_2

and

NaNO_3

when heated liberated dioxygen. (c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide (d) Hydrogen peroxide is used for the manufacture of sodium perborate

(A)(a), (b), (c) and (d)
(B)(a) and (c) only
(C)(a), (b) and (c) only
(D)(a), (c) and (d) only

Q70·ChemistrySingle correctJEE Main 2020

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

(A)less efficient as it exchanges only anions
(B)more efficient as it can exchange only cations
(C)less efficient as the resin cannot be regenerated
(D)more efficient as it can exchange both cation as well as anions

Q71·ChemistrySingle correctJEE Main 2019

The metal that gives hydrogen gas upon treatment with both acid as well as base is:

(A)iron
(B)magnesium
(C)zinc
(D)mercury

Q72·ChemistrySingle correctJEE Main 2019

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 :

(A)Mg(HCO $_{3}$ ) $_{2}$ and MgCO $_{3}$
(B)Ca(HCO $_{3}$ ) $_{2}$ and CaO
(C)Mg(HCO $_{3}$ ) $_{2}$ and Mg(OH) $_{2}$
(D)Ca(HCO $_{3}$ ) $_{2}$ and Ca(OH) $_{2}$

Q73·ChemistrySingle correctJEE Main 2019

The correct statements among (a) to (b) are: (a) saline hydrides produce H

_2

gas when reacted with H

_2

O. (b) reaction of LiAH

_4

with BF

_3

leads to B

_2

H

_6

. (c) PH

_3

and CH

_4

are electron - rich and electron-precise hydrides, respectively. (d) HF and CH

_4

are called as molecular hydrides.

(A)(c) and (d) only
(B)(a), (b) and (c) only
(C)(a), (b), (c) and (d)
(D)(a), (c) and (d) only

Q74·ChemistrySingle correctJEE Main 2019

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

(A)syn gas
(B)natural gas
(C)fuel gas
(D)laughing gas

Q75·ChemistrySingle correctJEE Main 2019

The strength of 11.2 volume solution of

H_2O_2

is: [Given that molar mass of H = 1 g mol

^{-1}

and O = 16 g mol

^{-1}

]

(A)3.4%
(B)1.7%
(C)13.6%
(D)34%

Q76·ChemistrySingle correctJEE Main 2019

100 mL 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

CaCO_3

is: (molar mass of calcium bicarbonate is

162\ g\ mol^{-1}

and magnesium bicarbonate is

146\ g\ mol^{-1}

)

(A)10,000 ppm
(B)1,000 ppm
(C)5,000 ppm
(D)100 ppm

Q77·ChemistrySingle correctJEE Main 2019

The hardness of water sample (in terms of equivalents of

CaCO_3

) containing

10^{-3}

M

CaSO_4

is (molar mass of

CaSO_4

= 136 g mol

^{-1}

)

(A)10 ppm
(B)50 ppm
(C)90 ppm
(D)100 ppm

Q78·ChemistrySingle correctJEE Main 2019

The volume strength of 1M

H_2O_2

is : (Molar mass of

H_2O_2

= 34 g mol

^{-1}

)

(A)5.6
(B)16.8
(C)11.35
(D)22.4

Q79·ChemistrySingle correctJEE Main 2019

The correct statements among (a) to (d) regarding

H_2

as a fuel are: (a) it produces less pollutants than petrol (b) A cylinder of compressed dihydrogen weighs ~30 times more than a petrol tank producing the same amount of energy. (c) Dihydrogen is stored in tanks of metal alloys like

NaNi_5

(d) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively.

(A)(b) and (d) only
(B)(a) and (d) only
(C)(b), (c) and (d) only
(D)(a), (b) and (c) only

Q80·ChemistrySingle correctJEE Main 2019

NaH is an example of:

(A)electron rich hydride
(B)metallic hydride
(C)saline hydride
(D)molecular hydride

Q81·ChemistrySingle correctJEE Main 2019

The chemical nature of hydrogen peroxide is

(A)oxidising agent in acidic medium, but not in basic medium
(B)reducing agent in basic medium but not in acidic medium
(C)oxidising and reducing agent in acidic medium but not in basic medium
(D)oxidising and reducing agent in both acidic and basic medium

Q82·ChemistrySingle correctJEE Main 2019

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

(A)3 and 1
(B)3 and 2
(C)2 and 1
(D)2 and 0

Q83·ChemistrySingle correctJEE Main 2019

The temporary hardness of water is due to

(A)Na $_2$ SO $_4$
(B)NaCl
(C)Ca(HCO $_3$ ) $_2$
(D)CaCl $_2$

Q84·ChemistrySingle correctJEE Main 2019

The isotopes of hydrogen are

(A)tritium and protium only
(B)protium and deuterium only
(C)protium, deuterium and tritium
(D)deuterium and tritium only

Q85·ChemistrySingle correctJEE Advanced 2017

Which of the following combination will produce

\mathrm{H_{2}}

gas?

(A)Fe metal and conc. $\mathrm{HNO_{3}}$
(B)Cu metal and conc. $\mathrm{HNO_{3}}$
(C)Zn metal and NaOH(aq)
(D)Au metal and NaCN (aq) in the presence of air

Q86·ChemistryMultiple correctJEE Advanced 2015

\mathrm{Fe^{3+}}

is reduced to

\mathrm{Fe^{2+}}

by using

(A) $\mathrm{H_{2}O_{2}}$ in presence of NaOH
(B) $\mathrm{Na_{2}O_{2}}$ in water
(C) $\mathrm{H_{2}O_{2}}$ in presence of $\mathrm{H_{2}SO_{4}}$
(D) $\mathrm{Na_{2}O_{2}}$ in presence of $\mathrm{H_{2}SO_{4}}$

Q87·ChemistrySingle correctJEE Advanced 2014

Hydrogen peroxide in its reaction with

\mathrm{KIO}_4

and

\mathrm{NH_2OH}

respectively, is acting as a

(A)reducing agent, oxidising agent
(B)reducing agent, reducing agent
(C)oxidising agent, oxidising agent
(D)oxidising agent, reducing agent

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