Which reaction shows oxidizing nature of ${{\rm{H}}_2}{{\rm{O}}_2}$?

${{\rm{H}}_2}{{\rm{O}}_2} + 2{\rm{KI}} \to 2{\rm{KOH}} + {{\rm{I}}_2}$

${\rm{C}}{{\rm{l}}_2} + {{\rm{H}}_2}{{\rm{O}}_2} \to 2{\rm{HCl}} + {{\rm{O}}_2}$

${{\rm{H}}_2}{{\rm{O}}_2} + {\rm{A}}{{\rm{g}}_2}{\rm{O}} \to 2{\rm{Ag}} + {{\rm{H}}_2}{\rm{O}} + {{\rm{O}}_2}$

${\rm{NaClO}} + {{\rm{H}}_2}{{\rm{O}}_2} \to {\rm{NaCl}} + {{\rm{H}}_2}{\rm{O}} + {{\rm{O}}_2}$

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

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NEET • CHEMISTRY • HYDROGEN

Hydrogen practice · Mixed difficulty

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Showing 1-30 of 187 questions

1 Easy

1 of 187

Understanding +4 | -1

Hydrogen accepts an electron to form inert gas configuration. In this it resembles

View answer and explanation

Correct option: A

halogens

Option A (halogens) is correct because hydrogen needs one electron to achieve an inert gas configuration, similar to halogens.

2 Easy

2 of 187

Application +4 | -1

\mathrm{CaC}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{Ca}(\mathrm{OH})_2+' \mathrm{X}\,'

\mathrm{Mg}_2 \mathrm{C}_3+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{Mg}(\mathrm{OH})_2+'\mathrm{Y}\,'

The products '

\mathrm{X}

' and '

\mathrm{Y}

' respectively are

View answer and explanation

Correct option: B

\mathrm{C}_2 \mathrm{H}_2

and

\mathrm{C}_3 \mathrm{H}_4

Option B (

\mathrm{C}_2 \mathrm{H}_2

and

\mathrm{C}_3 \mathrm{H}_4

) is correct because the hydrolysis of

\mathrm{CaC}_2

produces acetylene (

\mathrm{C}_2 \mathrm{H}_2

) and the hydrolysis of

\mathrm{Mg}_2 \mathrm{C}_3

produces propyne (

\mathrm{C}_3 \mathrm{H}_4

3 Easy

3 of 187

Understanding +4 | -1

{H_2}{O_2} \to 2{H^ + } + {O_2} + 2{e^ - };{E^0} = - 0.68V

This equation represents which of the following behaviour of

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

View answer and explanation

Correct option: A

reducing

Option A is correct because the equation

{H_2}{O_2} \to 2{H^ + } + {O_2} + 2{e^ - };{E^0} = - 0.68V

represents the reducing behavior of

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

, as it is losing electrons.

4 Easy

4 of 187

Analyzing +4 | -1

Which reaction shows oxidizing nature of

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

View answer and explanation

Correct option: A

{\mathrm{H}_2}{\mathrm{O}_2} + 2\mathrm{KI} \to 2\mathrm{KOH} + {\mathrm{I}_2}

Option A (

{\mathrm{H}_2}{\mathrm{O}_2} + 2\mathrm{KI} \to 2\mathrm{KOH} + {\mathrm{I}_2}

) is correct because

H_2O_2

oxidizes

KI

I_2

, indicating its oxidizing nature.

5 Easy

5 of 187

Understanding +4 | -1

Which of the following could act as propellent for rockets.

View answer and explanation

Correct option: A

Liq.

{H_2} + Liq.{O_2}

Option A (Liq.

{H_2} + Liq.{O_2}

) is correct because liquid hydrogen and liquid oxygen are a common and highly energetic propellant combination for rockets.

6 Medium

6 of 187

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.

7 Medium

7 of 187

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.

8 Medium

8 of 187

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.

9 Medium

9 of 187

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.

10 Easy

10 of 187

Remembering +4 | -1

Triple point of water is

View answer and explanation

Correct option: C

273 K

Option C is correct because the triple point of water is defined as the temperature and pressure at which water can exist in equilibrium in the solid, liquid, and gaseous phases, which is approximately 273.16 K (0.01 °C).

11 Medium

11 of 187

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.

12 Hard

12 of 187

Understanding +4 | -1

Consider the following statements:
1. Atomic hydrogen is obtained by passing hydrogen through an electric arc.
2. Hydrogen gas will not reduce heated aluminium oxide.
3. Finely divided palladium adsorbs large volume of hydrogen gas
4. Pure nascent hydrogen is best obtained by reacting

Na

with

C_2H_5OH

Which of the above statements is/are correct?

View answer and explanation

Correct option: C

1, 2 and 3

Option C (1, 2 and 3) is correct because statements 1, 2, and 3 are all factually accurate regarding the properties and reactions of hydrogen.

13 Medium

13 of 187

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.

14 Medium

14 of 187

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.

15 Medium

15 of 187

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.

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16 Medium

16 of 187

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.

17 Medium

17 of 187

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.

18 Hard

18 of 187

Analyzing +4 | -1

Assertion (A) : On adding zinc pieces to

{FeCl}_3(a q)

solution, colour changes from deep yellow to light green.

Reason (R) : Aqueous

{FeCl}_3

solution is acidic and on adding zinc, nascent hydrogen is produced which reduces deep yellow

m{FeCl}_3

solution to light green

{FeCl}_2

solution.

View answer and explanation

Correct option: A

Both

\mathbf{A}

and

\mathbf{R}

are true and

\mathbf{R}

is the correct explanation of

\mathbf{A}

Option A (Both

\mathbf{A}

and

\mathbf{R}

are true and

\mathbf{R}

is the correct explanation of

\mathbf{A}

) is correct because the zinc reduces the iron(III) chloride to iron(II) chloride, causing the color change.

19 Hard

19 of 187

Application +4 | -1

The hardness of a water sample (in terms of equivalents of

CaC{O_3})

containing

{10^{ - 3}}M\,CaS{O_4}

(Molar mass of

CaS{O_4} = 136\,\,g\,\,mo{l^{ - 1}})

View answer and explanation

Correct option: A

100 ppm

Option A (100 ppm) is correct because the hardness is calculated by converting the molarity of CaSO4 to ppm of CaCO3.

20 Easy

20 of 187

Understanding +4 | -1

Hard water when passed through ion exchange resin containing

R - COOH

group, becomes free atom

View answer and explanation

Correct option: D

C{a^{ + 2}}

Option D is correct because the ion exchange resin replaces the calcium ions with hydrogen ions, thus removing calcium.

21 Medium

21 of 187

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.

22 Easy

22 of 187

Remembering +4 | -1

High boiling point of water is due to:

View answer and explanation

Correct option: B

Hydrogen bonding

Option B is correct because the high boiling point of water is primarily due to the presence of strong hydrogen bonds between water molecules.

23 Easy

23 of 187

Understanding +4 | -1

Ortho Hydrogen and para Hydrogen resemble in which of the following property

View answer and explanation

Correct option: C

chemical properties

Option C (chemical properties) is correct because ortho and para hydrogen are allotropes that differ in nuclear spin but have the same chemical properties.

24 Medium

24 of 187

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.

25 Easy

25 of 187

Understanding +4 | -1

Which of the following pair of ions makes the water hard

View answer and explanation

Correct option: B

C{a^{2 + }},HCO_3^ -

Option B is correct because calcium and bicarbonate ions are the primary contributors to water hardness, especially temporary hardness.

26 Medium

26 of 187

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.

27 Easy

27 of 187

Remembering +4 | -1

Permanent hardness can be removed by adding

View answer and explanation

Correct option: B

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}

Option B (

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}

) is correct because sodium carbonate (washing soda) is used to precipitate out the calcium and magnesium ions that cause permanent hardness.

28 Medium

28 of 187

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.

29 Medium

29 of 187

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.

30 Medium

30 of 187

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%.

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Key Takeaways

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