more or less identical in polarity with $\mathrm{H}_2 \mathrm{S}$

less polar than $\mathrm{H}_2 \mathrm{S}$

10 Volume ${{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}$ means

1 gr ${{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}$ gives $10\,ml\,{O_2}$ at NTP

$1\,mol\,{H_2}{O_2}$ gives $10\,ml\,{O_2}\,$ at NTP

Both para and ortho hydrogen exist

The O—O bond length in ${{\rm{H}}_2}{{\rm{O}}_2}$ is:

$1.48\mathop {\rm A}\limits^ \circ $

$1.54\mathop {\rm A}\limits^ \circ $

$1.34{\rm{ }}\mathop {\rm A}\limits^ \circ $

$1.01{\rm{ }}\mathop {\rm A}\limits^ \circ $

Decolourisation of acidified potassium permanganate occurs when ${{\rm{H}}_2}{{\rm{O}}_2}$ is added to it. This is due to:

Reduction of ${\rm{KMn}}{{\rm{O}}_4}$

Oxidation of ${\rm{KMn}}{{\rm{O}}_4}$

Both oxidation and reduction of ${\rm{KMn}}{{\rm{O}}_4}$

${{\rm{H}}_2}{{\rm{O}}_2}$ is stored in:

Iron container after addition of stabilizer

Glass container after addition of stabilizer

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JEE • CHEMISTRY • HYDROGEN

Hydrogen practice · Mixed difficulty

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These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 31-60 of 179 questions

31 Medium

31 of 179

Understanding +4 | -1

Water is :

View answer and explanation

Correct option: A

more polar than

\mathrm{H}_2 \mathrm{S}

Option A (more polar than

\mathrm{H}_2 \mathrm{S}

) is correct because oxygen is more electronegative than sulfur, leading to a greater dipole moment in water.

32 Easy

32 of 179

Remembering +4 | -1

The bleaching properties of

{\mathrm{H}_2}{\mathrm{O}_2}

are due to its:

View answer and explanation

Correct option: B

Oxidizing properties

Option B (Oxidizing properties) is correct because hydrogen peroxide acts as a bleaching agent due to its ability to oxidize colored substances.

33 Easy

33 of 179

Remembering +4 | -1

The exhausted Permutit is generally regenerated by percolating through it a solution of:

View answer and explanation

Correct option: A

Sodium chloride

Option A (Sodium chloride) is correct because sodium chloride solution is used to regenerate exhausted Permutit by replacing calcium and magnesium ions with sodium ions.

34 Medium

34 of 179

Understanding +4 | -1

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 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

.
which

oc

the given statement are correct

View answer and explanation

Correct option: A

A, B and C

The correct answer is A, B and C because statements A, B, and C about heavy water are accurate, while statement D is incorrect.

35 Easy

35 of 179

Understanding +4 | -1

10 Volume

{\mathrm{H}_\mathrm{2}}{\mathrm{O}_\mathrm{2}}

means

View answer and explanation

Correct option: A

1\,ml\,{H_2}{O_2}

gives

10\,ml\,{O_2}

at NTP

Option A (

1\,ml\,{H_2}{O_2}

gives

10\,ml\,{O_2}

at NTP) is correct because it accurately defines the volume strength of hydrogen peroxide.

36 Medium

36 of 179

Understanding +4 | -1

In alkaline medium,

{H_2}{O_2}

reacts with

F{e^{ + 3}}

and

M{n^{ + 2}}

respectively to give

View answer and explanation

Correct option: C

F{e^{ + 2}}\mathrm{ and }M{n^{ + 4}}

Option C (

F{e^{ + 2}}\mathrm{ and }M{n^{ + 4}}

) is correct because

{H_2}{O_2}

reduces

F{e^{ + 3}}

F{e^{ + 2}}

and oxidizes

M{n^{ + 2}}

M{n^{ + 4}}

37 Easy

37 of 179

Remembering +4 | -1

Tritium is obtained by:

View answer and explanation

Correct option: A

Nuclear reactions

Option A (Nuclear reactions) is correct because Tritium is a radioactive isotope of hydrogen produced through nuclear reactions.

38 Medium

38 of 179

Understanding +4 | -1

The number of Hydrogen bonded water molecules associated with

CuS{O_4}.5{H_2}O

View answer and explanation

Correct option: B

Option B (1) is correct because only one water molecule in

CuSO_4.5H_2O

is directly hydrogen-bonded.

39 Medium

39 of 179

Understanding +4 | -1

Given below are two statements
Statement I:

\mathrm{H}_{2} \mathrm{O}_{2}

is used in the synthesis of Cephalosporin
Statement II:

\mathrm{H}_{2} \mathrm{O}_{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

View answer and explanation

Correct option: D

Both Statement I and Statement II are correct

Option D (Both Statement I and Statement II are correct) is correct because hydrogen peroxide is used in the synthesis of Cephalosporin and for restoring aerobic conditions to sewage wastes.

40 Hard

40 of 179

Application +4 | -1

The volume strength of

1.5N\,{H_2}{O_2}

solution is

View answer and explanation

Correct option: B

8.4

Option B (8.4) is correct because volume strength is calculated by multiplying normality by 5.6.

41 Hard

41 of 179

Application +4 | -1

The percentage by weight of hydrogen in

{\mathrm{H}_2}{\mathrm{O}_2}

is:

View answer and explanation

Correct option: A

5.88

Option A (5.88) is correct because the percentage by weight of hydrogen in H2O2 is calculated by dividing the total weight of hydrogen atoms by the molecular weight of H2O2 and multiplying by 100.

42 Medium

42 of 179

Understanding +4 | -1

{\mathrm{H}_2}{\mathrm{O}_2}

reduces

{\mathrm{K}_3}\mathrm{Fe}{\left( {\mathrm{CN}} \right)_6}

in:

View answer and explanation

Correct option: C

Alkaline solution

Option C (Alkaline solution) is correct because

{\mathrm{H}_2}{\mathrm{O}_2}

reduces

{\mathrm{K}_3}\mathrm{Fe}{\left( {\mathrm{CN}} \right)_6}

to potassium ferrocyanide in alkaline medium.

43 Easy

43 of 179

Application +4 | -1

Given

(A)

2 \mathrm{CO}(\mathrm{g})+\mathrm{O}_2(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_2(\mathrm{~g}) \quad \Delta \mathrm{H}_1^\theta=-\mathrm{xkJ} \mathrm{mol}^{-1}

(B)

\mathrm{C}

(graphite

)+\mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}_2(\mathrm{~g}) \quad \Delta \mathrm{H}_2^\theta=-\mathrm{ykmol}^{-1}

The

\Delta \mathrm{H}^\theta

for the reaction

\mathrm{C}(

graphite

)+\frac{1}{2} \mathrm{O}_2(\mathrm{~g}) \rightarrow \mathrm{CO}(\mathrm{g})

View answer and explanation

Correct option: C

\frac{x-2 y}{2}

Option C (

\frac{x-2 y}{2}

) is correct because it is derived from Hess's Law by manipulating the given equations to obtain the desired reaction.

44 Medium

44 of 179

Remembering +4 | -1

{K_\mathrm{a}}\;\mathrm{for}\;{\mathrm{H}_2}{\mathrm{O}_2}

is of the order of:

View answer and explanation

Correct option: A

{10^{ - 12}}

Option A (

{10^{ - 12}}

) is correct because the acid dissociation constant (

{K_\mathrm{a}}

) for

{\mathrm{H}_2}{\mathrm{O}_2}

is approximately

{10^{ - 12}}

45 Easy

45 of 179

Understanding +4 | -1

At absolute zero:

View answer and explanation

Correct option: A

Only para hydrogen exists

Option A (Only para hydrogen exists) is correct because at absolute zero, the lowest energy state is favored, and para-hydrogen has a lower energy state than ortho-hydrogen.

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46 Easy

46 of 179

Remembering +4 | -1

Density of water is maximum at :

View answer and explanation

Correct option: C

4^\circ \mathrm{C}

Option C (

4^{\circ} \mathrm{C}

) is correct because water has its maximum density at 4 degrees Celsius.

47 Easy

47 of 179

Remembering +4 | -1

Which of the following is used as a moderator in nuclear reactors.

View answer and explanation

Correct option: B

heavy water

Option B (heavy water) is the correct answer because heavy water (D2O) is an effective moderator due to its ability to slow down neutrons without significant absorption.

48 Medium

48 of 179

Analyzing +4 | -1

Assertion : We feel cold on touching the ice.

Reason : Ice is a solid form of water.

View answer and explanation

Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

Option B (If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.) is correct because the assertion is true, and the reason is also true, but the reason does not explain the assertion.

49 Medium

49 of 179

Understanding +4 | -1

Heavy water is not used for dinking because:

View answer and explanation

Correct option: C

Its physiological action is different from ordinary water

Option C is correct because heavy water's physiological action differs from ordinary water, affecting biological processes.

50 Easy

50 of 179

Remembering +4 | -1

The O—O bond length in

{\mathrm{H}_2}{\mathrm{O}_2}

is:

View answer and explanation

Correct option: B

1.48\mathop \mathrm{A}\limits^ \circ

Option B (

1.48\mathop \mathrm{A}\limits^ \circ

) is correct because the O-O bond length in

H_2O_2

is experimentally determined to be approximately 1.48 Angstroms.

51 Easy

51 of 179

Understanding +4 | -1

Which of the following gives

{H_2}{O_2}

on hydrolysis?

View answer and explanation

Correct option: B

{H_2}S{O_5}

The correct answer is B (

{H_2}S{O_5}

) because its hydrolysis yields sulphuric acid and hydrogen peroxide (

{H_2}{O_2}

52 Easy

52 of 179

Remembering +4 | -1

Which physical property of dihydrogen is wrong

View answer and explanation

Correct option: D

Non-inflammable gas

Option D (Non-inflammable gas) is correct because dihydrogen (H₂) is highly flammable and readily combusts with oxygen.

53 Medium

53 of 179

Understanding +4 | -1

Hydrogen peroxide when added to a solution of potassium permanganate acidified with sulphuric acid

View answer and explanation

Correct option: C

Acts as a reducing agent

The correct answer is C (Acts as a reducing agent) because hydrogen peroxide reduces potassium permanganate in acidic medium, itself getting oxidized to oxygen.

54 Easy

54 of 179

Application +4 | -1

The number of protons, electrons and neutrons respectively in a molecule of heavy water is:

View answer and explanation

Correct option: A

10,\mathrm{ }10,\mathrm{ }10

The correct answer is

10,\mathrm{ }10,\mathrm{ }10

because heavy water (

D_2O

) has 2 deuterium atoms (1 proton, 1 neutron, 1 electron each) and 1 oxygen atom (8 protons, 8 neutrons, 8 electrons).

55 Medium

55 of 179

Understanding +4 | -1

Decolourisation of acidified potassium permanganate occurs when

{\mathrm{H}_2}{\mathrm{O}_2}

is added to it. This is due to:

View answer and explanation

Correct option: B

Reduction of

\mathrm{KMn}{\mathrm{O}_4}

Option B is correct.

{H_2}{O_2}

reduces

KMnO_4

because it acts as a reducing agent, causing the decolourisation.

Mn^{7+}

is reduced to

Mn^{2+}

56 Easy

56 of 179

Remembering +4 | -1

Which one of the following is called amphoteric solvent?

View answer and explanation

Correct option: D

Water

Option D (Water) is correct because water is an amphoteric solvent, meaning it can act as both an acid and a base.

57 Easy

57 of 179

Remembering +4 | -1

Permutit is:

View answer and explanation

Correct option: A

Hydrated sodium aluminium silicate

Option A (Hydrated sodium aluminium silicate) is correct because Permutit is a synthetic zeolite, which is a hydrated sodium aluminum silicate used for water softening.

58 Easy

58 of 179

Remembering +4 | -1

{\mathrm{H}_2}{\mathrm{O}_2}

is stored in:

View answer and explanation

Correct option: C

Plastic container after addition of stabilizer

Option C is correct because H₂O₂ is stored in plastic containers with stabilizers to prevent decomposition, which can be catalyzed by metal ions.

59 Easy

59 of 179

Remembering +4 | -1

The maximum possible number of hydrogen bonds a water molecule can form is:

View answer and explanation

Correct option: D

Option D (4) is correct because a water molecule can form two hydrogen bonds through its two hydrogen atoms and accept two hydrogen bonds through its two lone pairs on the oxygen atom.

60 Easy

60 of 179

Remembering +4 | -1

The electronic configuration of deuterium is:

View answer and explanation

Correct option: D

1{s^1}

Option D (

1{s^1}

) is correct because deuterium is an isotope of hydrogen with one proton and one neutron, thus having only one electron with the electronic configuration of

1{s^1}

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