Pure ${{\rm{H}}_2}$ is obtained by the action of:

NaH over ${{\rm{H}}_2}{\rm{O}}$

Electrolysis of warm solution of ${\rm{Ba}}{\left( {{\rm{OH}}} \right)_2}{\rm{.}}$ using Ni electrodes

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

The reaction, ${{\rm{H}}_2}{\rm{S}} + {{\rm{H}}_2}{{\rm{O}}_2} \to {\rm{S}} + 2{{\rm{H}}_2}{\rm{O}}$ manifests:

Oxidizing nature of ${{\rm{H}}_2}{{\rm{O}}_2}$

Acidic nature of ${{\rm{H}}_2}{{\rm{O}}_2}$

Alkaline nature of ${{\rm{H}}_2}{{\rm{O}}_2}$

Reducing nature of ${{\rm{H}}_2}{{\rm{O}}_2}$

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NEET • CHEMISTRY • HYDROGEN

Hydrogen practice · Medium

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Showing 1-30 of 94 questions

1 Medium

1 of 94

Analyzing +4 | -1

(A):

{SiH}_4

AlH_3

and

{NH}_3

are ionic hydrides

(R):Ionic hydrides do not react with water

View answer and explanation

Correct option: D

Both

(A)

and

(R)

are false

Option D is correct because the assertion that SiH4, AlH3, and NH3 are ionic hydrides is false, as they are covalent. Also, the reason that ionic hydrides do not react with water is also false, as they react vigorously.

2 Medium

2 of 94

Application +4 | -1

The volume of ’10 vol.’ of

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

required to liberate 500 mL

{\mathrm{O}_2}

at NTP is:

View answer and explanation

Correct option: A

50 mL

Option A (50 mL) is correct because '10 vol' H2O2 means 1 mL of H2O2 gives 10 mL of O2, so to get 500 mL O2, you need 50 mL of H2O2.

3 Medium

3 of 94

Remembering +4 | -1

The water gas on reacting with cobalt as a catalyst forms

View answer and explanation

Correct option: D

Methanol

Option D (Methanol) is correct because water gas reacts with cobalt as a catalyst to form methanol.

4 Medium

4 of 94

Remembering +4 | -1

Hydrogen is prepared on large scale for industrial use

View answer and explanation

Correct option: D

From water gas

Option D (From water gas) is correct because the industrial production of hydrogen primarily involves the water gas shift reaction and steam reforming of hydrocarbons.

5 Medium

5 of 94

Understanding +4 | -1

Hydrogen is not obtained when zinc reacts with

View answer and explanation

Correct option: A

Cold water

Option A (Cold water) is correct because zinc does not react with cold water to produce hydrogen.

6 Medium

6 of 94

Understanding +4 | -1

Under what conditions of temperature and pressure, the formation of atomic hydrogen from molecular hydrogen will be favoured more?

View answer and explanation

Correct option: A

High temperature and low pressure

Option A (High temperature and low pressure) is correct because the formation of atomic hydrogen is endothermic and involves an increase in the number of moles, favoring high temperature and low pressure.

7 Medium

7 of 94

Remembering +4 | -1

The chemical formula of zeolite is

View answer and explanation

Correct option: C

N{a_2}A{l_2}S{i_2}{O_8}x{H_2}O

Option C (

N{a_2}A{l_2}S{i_2}{O_8}x{H_2}O

) is correct because it represents the general formula for zeolites, which are hydrated sodium aluminum silicates.

8 Medium

8 of 94

Remembering +4 | -1

Atomic hydrogen is obtained by

View answer and explanation

Correct option: D

Passing silen electric discharge through Hydrogen at low pressure

Option D (Passing silen electric discharge through Hydrogen at low pressure) is correct because this method provides the energy needed to break the H-H bond, forming atomic hydrogen.

9 Medium

9 of 94

Understanding +4 | -1

{D_2}O

is preferred to

{H_2}O

, as a moderator, in nuclear reactors because

View answer and explanation

Correct option: D

{H_2}O

absorbs neutrons

Option D (

{H_2}O

absorbs neutrons) is correct because

{D_2}O

is preferred as a moderator because it absorbs fewer neutrons than

{H_2}O

, allowing for a more efficient chain reaction.

10 Medium

10 of 94

Understanding +4 | -1

Pure

{\mathrm{H}_2}

is obtained by the action of:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because all the listed methods can produce pure hydrogen gas.

11 Medium

11 of 94

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 (Reduction of

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

) is correct because

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

acts as a reducing agent, reducing

Mn^{7+}

KMnO_4

Mn^{2+}

, which is colorless.

12 Medium

12 of 94

Understanding +4 | -1

Polyphosphates are used as water softening agents because they

View answer and explanation

Correct option: D

Form soluble complexes with cationic species

Option D is correct because polyphosphates form soluble complexes with calcium and magnesium ions, preventing them from causing hardness.

13 Medium

13 of 94

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

Option C is correct because hydrogen peroxide donates electrons to potassium permanganate, reducing it and acting as a reducing agent.

14 Medium

14 of 94

Understanding +4 | -1

Which statement about zeolite is false?

View answer and explanation

Correct option: D

Some of the

\mathrm{SiO}_4^{4 - }

units are replaced by

\mathrm{AlO}_4^{5 - }

and

\mathrm{AlO}_6^{9 - }

ions in zeolites

Option D is correct because in zeolites, some

SiO_4^{4-}

units are replaced by

AlO_4^{5-}

units, not

AlO_6^{9-}

ions.

15 Medium

15 of 94

Analyzing +4 | -1

In which of the following reactions

{H_2}{O_2}

acts as an oxidizing agent?

View answer and explanation

Correct option: A

KN{O_2} + {H_2}{O_2} \to KN{O_3} + {H_2}O

Option A (Golden yellow colour) is correct because sodium emits a golden yellow color when heated in a flame due to electronic transitions.

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16 Medium

16 of 94

Analyzing +4 | -1

Which one of the following statements is incorrect?

View answer and explanation

Correct option: B

At around 2000 K, the dissociated of dihydrogen into its atoms is nearly 8.1 %

Option A (At around 2000 K, the dissociated of dihydrogen into its atoms is nearly 8.1 %) is incorrect because the dissociation of dihydrogen into its atoms at 2000 K is much higher than 8.1%.

17 Medium

17 of 94

Understanding +4 | -1

When zeolite is treated with hard water the sodium ions are exchanged with

View answer and explanation

Correct option: C

both 1 & 2 

Option C is correct because zeolite exchanges sodium ions with both calcium and magnesium ions present in hard water.

18 Medium

18 of 94

Analyzing +4 | -1

Assertion (A) : Ionisation constant of

\mathrm{CH}_3 \mathrm{COOH}

and

\mathrm{CH}_3 \mathrm{COOD}

are very equal.

Reason (R): The kinetic isotopic effect is not observed in the ionisation of weak acid.

View answer and explanation

Correct option: D

\mathbf{A}

and

\mathbf{R}

both are false

Option D (

\mathbf{A}

and

\mathbf{R}

both are false) is correct because the ionization constants of

\mathrm{CH}_3\mathrm{COOH}

and

\mathrm{CH}_3\mathrm{COOD}

are slightly different due to the kinetic isotopic effect, and this effect is observed in the ionization of weak acids.

19 Medium

19 of 94

Understanding +4 | -1

The reaction,

{\mathrm{H}_2}\mathrm{S} + {\mathrm{H}_2}{\mathrm{O}_2} \to \mathrm{S} + 2{\mathrm{H}_2}\mathrm{O}

manifests:

View answer and explanation

Correct option: C

Oxidizing nature of

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

Option C (Oxidizing nature of

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

) is correct because in this reaction,

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

oxidizes

{\mathrm{H}_2}\mathrm{S}

to S, meaning

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

itself is reduced, thus acting as an oxidizing agent.

20 Medium

20 of 94

Application +4 | -1

When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is:

View answer and explanation

Correct option: A

1\;:\;1

The ratio of volumes of hydrogen evolved is 1:1 because the same amount of zinc reacts to produce the same number of moles of hydrogen gas in both reactions.

21 Medium

21 of 94

Remembering +4 | -1

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

View answer and explanation

Correct option: C

syn gas

Option C (syn gas) is correct because syn gas (synthesis gas) is the term used for water gas (CO + H2) when it's used as a feedstock for synthesizing other chemicals, like methanol.

22 Medium

22 of 94

Analyzing +4 | -1

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

acts as a reducing agent in

View answer and explanation

Correct option: D

2 \mathrm{NaOCl}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}

Option D (

2 \mathrm{NaOCl}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}

) is correct because the oxidation state of oxygen in

H_2O_2

increases from -1 to 0, indicating it is acting as a reducing agent.

23 Medium

23 of 94

Analyzing +4 | -1

An inorganic compound liberates

{\mathrm{O}_2}

when heated, turns an acid solution of KI brown and reduces acidified

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

. The substance is:

View answer and explanation

Correct option: A

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

Option B (

\mathrm{Cs}

) is correct because Cesium (Cs) is the most electropositive element among the given options due to its low ionization energy.

24 Medium

24 of 94

Remembering +4 | -1

Permanent hardness of water can be removed by

View answer and explanation

Correct option: B

Permutit process

Option B is correct because the Permutit process uses zeolites to exchange ions and remove permanent hardness from water.

25 Medium

25 of 94

Application +4 | -1

What is the degree of hardness of a sample of water containing

6 \mathrm{mg}

\mathrm{MgSO}_4

(molecular mass 120 ) per

\mathrm{kg}

of water?

View answer and explanation

Correct option: A

Option A (5) is correct because hardness is expressed in terms of CaCO3 equivalents.

26 Medium

26 of 94

Analyzing +4 | -1

Select the incorrect statement among the following

View answer and explanation

Correct option: D

{H_2}{O_2}\,oxidises\mathrm{ }PbS\mathrm{ }into\mathrm{ }S{O_2}

Option C (

{H_2}O\mathrm{ }\,\mathrm{and}\,\mathrm{ }\left( {{H_2}O + {O_2}} \right)

) is correct because in acidic medium, hydrogen peroxide oxidizes

{\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{4 - }}

{\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}

producing water, and in alkaline medium, it reduces

{\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{3 - }}

{\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{4 - }}

producing water and oxygen.

27 Medium

27 of 94

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 in the order of

{10^{ - 12}}

28 Medium

28 of 94

Remembering +4 | -1

The lightest gas is:

View answer and explanation

Correct option: D

Hydrogen

Option D (Hydrogen) is correct because hydrogen has the lowest atomic mass among the given options, making it the lightest gas.

29 Medium

29 of 94

Remembering +4 | -1

At ordinary temperature, the ortho and para hydrogen exist in the ratio of

View answer and explanation

Correct option: D

3: 1

Option D (

3: 1

) is correct because at ordinary temperature, the ortho and para hydrogen exist in the ratio of 3:1.

30 Medium

30 of 94

Analyzing +4 | -1

In which of the following reactions does hydrogen act as an oxidising agent:-

View answer and explanation

Correct option: C

\mathrm{Na}+\mathrm{H}_2 \longrightarrow

Option C (

\mathrm{Na}+\mathrm{H}_2 \longrightarrow

) is correct because in this reaction, hydrogen gains an electron and its oxidation state changes from 0 to -1, thus acting as an oxidizing agent.

Revision notes and key takeaways

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Key Takeaways

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