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Hydrogen

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Q 1. {tex} \mathrm { Ag } _ { 2 } \mathrm { O } + \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } \rightarrow 2 \mathrm { Ag } + \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { O } _ { 2 } {/tex}

In an above reaction {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} acts as/an

Oxidizing agent

Reducing agent

Bleaching agent

None of these

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Q 2. How does {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} differ from {tex} \mathrm { O } _ { 3 } {/tex} in its chemical action?

In oxidizing {tex}\mathrm{PbS}{/tex} to {tex}\mathrm{PbSO_4}{/tex}

In librating {tex} \mathrm { I } _ { 2 } {/tex} from {tex}\mathrm{KI}{/tex}

In decolorizing acidified {tex}\mathrm{KMnO_4}{/tex}

In oxidizing {tex} \mathrm { K } _ { 4 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] {/tex} to {tex} \mathrm { K } _ { 3 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] {/tex}

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Q 3. Select the incorrect statement

{tex} \mathrm { H } ^ { + } {/tex} can exist as {tex} \mathrm { H } _ { 9 } \mathrm { O } _ { 4 } ^ { + } {/tex} in water

{tex} \mathrm { H } _ { 2 } {/tex} is thermally stable

Ionisation of {tex} \mathrm { CH } _ { 3 } \mathrm { COOH } {/tex} is slower than that of {tex} \mathrm { CH } _ { 3 } \mathrm { COOD } {/tex}

Kinetic isotopic effect is observed when there is retardation in the rate water {tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} is replaced by {tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex}

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Q 4. Consider the following reactions

I: {tex} \mathrm { AlH } _ { 3 } + \mathrm { H } ^ { - } \rightarrow \mathrm { AlH } _ { 4 } ^ { - } {/tex}

II: {tex} \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { H } ^ { - } \rightarrow \mathrm { H } _ { 2 } + \mathrm { OH } ^ { - } {/tex}

Select the correct statements based on these reactions

{tex} \mathrm { H } ^ { - } {/tex} is a Lewis acid in I and Lewis base in II

{tex} \mathrm { H } ^ { - } {/tex} is a Lewis base in I and Bronsted base in II

{tex} \mathrm { H } ^ { - } {/tex} is a Lewis acid in I and Bronsted acid in II

{tex} \mathrm { H } ^ { - } {/tex} is a Lewis base in I and II

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Q 5. {tex} \mathrm { H } _ { 2 } {/tex} reacts much faster with {tex} \mathrm { Cl } _ { 2 } {/tex} than {tex} \mathrm { D } _ { 2 } {/tex}, because

Rate of diffusion of {tex} \mathrm { H } _ { 2 } {/tex} is greater than {tex} \mathrm { D } _ { 2 } {/tex}

{tex} \mathrm { H } _ { 2 } {/tex} has lower energy of activation than {tex} \mathrm { D } _ { 2 } {/tex}

Both (a) and (b) are correct

None of the statements is correct

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Q 6. Which among the following is a hydride?

Rongalite

Nitrolim

Hydrolith

Minium

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Q 7.

Consider the following statements

and forms of hydrogens are

I. different due to difference in their nuclear spins

II. different due to difference in their electrons spins

III. have same physical properties

I II III

T F

F T F

T F

T F T

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Q 8.

This represents

Oxidation of

Reduction of

Disproportionation of

Acidic nature of

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Q 9.

Oxidant, reductant

Bleaching agent

Antiseptic

Catalyst

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Q 10.

Which of the following easily reacts with water producing hydrogen?

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Q 11.

Molar ratio of

1:1

1:2

3:5

5:3

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Q 12.

Hydrogen

Is placed in I A since it forms monovalent cation

Is placed in VII A (halogen family) since it forms monovalent anion

Is placed in IV A (carbon family) since both have a half-filled shell of electrons

Follows all of the above facts

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Q 13.

Perhydrol is

30% solution of

“100 volume”

Both (a) and (b) are correct

None of the above is correct

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Q 14.

Select the correct statement(s)

All the above are correct statements

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Q 15.

Water gas

Water gas by oxidation of

Electrolysis of water

All the above methods

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Q 16.

The set of elements which could form stable, covalent hydrogen bonded hydrides are

Nitrogen, oxygen and fluorine

Lithium, sodium and potassium

Sulphur, selenium and tellurium

Chlorine, bromine and iodine

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Q 17.

The volume of oxygen librated at NTP from

“20 volume” means

Thus,

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Q 18.

The hardness of water is estimated by

EDTA method

Titrimetric method

Conductivity method

Distillation method

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Q 19.

Which is radioactive isotope of hydrogen?

All of those

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Q 20.

Which is not the correct statement?

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Q 21.

Heavy water is

Water at

Water containing heavy ions

Water containing sulphate of

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Q 22.

0 K

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Q 23.

The most stable is

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Q 24.

Water gas is a mixture of

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Q 25.

Dil.

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