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JEE Advanced > Electrochemistry

Explore popular questions from Electrochemistry for JEE Advanced. This collection covers Electrochemistry previous year JEE Advanced questions hand picked by experienced teachers.

Q 1.

Correct4

Incorrect-1

The standard EMF of quinhydrone electrode is {tex} 0.699 \mathrm { V } {/tex}. The EMF of the quinhydrone electrode dipped in a solution with {tex} \mathrm { pH } = 10 {/tex} is

{tex} 0.109 \mathrm { V } {/tex}

B

{tex} - 0.109 \mathrm { V } {/tex}

C

{tex} 1.289 \mathrm { V } {/tex}

D

{tex} - 1.289 \mathrm { V } {/tex}

Explanation

Q 2.

Correct4

Incorrect-1

The potential of a hydrogen electrode in a solution with {tex} \mathrm { pOH } = 4 {/tex} at {tex} 25 ^ { \circ } \mathrm { C } {/tex} is

A

{tex} - 0.059 {/tex}

B

{tex}0.059{/tex}

{tex} - 0.59 {/tex}

D

{tex}0.59{/tex}

Explanation

Q 3.

Correct4

Incorrect-1

Faraday's laws of electrolysis are related to the

A

The atomic number of the cation

B

The atomic number of anion

The equivalent weight of the electrolyte

D

The speed of the cation

Explanation

Faradays first's law

Q 4.

Correct4

Incorrect-1

For the half cell

At {tex} \mathrm { pH } = 2 , {/tex} the electrode potential is

A

{tex} 1.36 \mathrm { V } {/tex}

B

{tex} 1.30 \mathrm { V } {/tex}

{tex} 1.42 \mathrm { V } {/tex}

D

{tex} 1.20 \mathrm { V } {/tex}

Explanation


Q 5.

Correct4

Incorrect-1

The volume of gases evolved at STP by passing {tex}0.2{/tex} A of current for {tex}965{/tex} s through an aqueous solution of sodium fumarate is

A

{tex} 22.4 \mathrm { mL } {/tex}

B

{tex} 11.2 \mathrm { mL } {/tex}

{tex} 89.6 \mathrm { mL } {/tex}

D

{tex} 44.8 \mathrm { mL } {/tex}

Explanation

Q 6.

Correct4

Incorrect-1

The standard reduction potential {tex} \mathrm E ^ { \ominus } {/tex} for the half reactions are follows:
{tex} \mathrm { Zn } \rightarrow \mathrm { Zn } ^ { 2 + } + 2 e ^ { - } ; \quad \mathrm E ^ { \ominus } = + 0.76 \mathrm { V } {/tex}
{tex} \mathrm { Fe } \rightarrow \mathrm { Fe } ^ { 2 + } + 2 e ^ { - } ; \quad \mathrm E ^ { \ominus } = 0.41 \mathrm { V } {/tex}
The EMF for the cell reaction
{tex} \mathrm { Fe } ^ { 2 + } + \mathrm { Zn } \rightarrow \mathrm { Zn } ^ { 2 + } + \mathrm { Fe } {/tex} is

A

{tex} - 0.35 \mathrm { V } {/tex}

{tex} + 0.35 \mathrm { V } {/tex}

C

{tex} + 1.17 \mathrm { V } {/tex}

D

{tex} - 1.17 \mathrm { V } {/tex}

Explanation


Q 7.

Correct4

Incorrect-1

Rust is a mixture of

A

{tex} \mathrm { FeO } {/tex} and {tex} \mathrm { Fe } ( \mathrm { OH } ) _ { 2 } {/tex}

B

{tex} \mathrm { FeO } {/tex} and {tex} \mathrm { Fe } ( \mathrm { OH } ) _ { 3 } {/tex}

{tex} \mathrm { Fe } _ { 2 } \mathrm { O } _ { 3 } {/tex} and {tex} \mathrm { Fe } ( \mathrm { OH } ) _ { 3 } {/tex}

D

{tex} \mathrm { Fe } _ { 3 } \mathrm { O } _ { 4 } {/tex} and {tex} \mathrm { Fe } ( \mathrm { OH } ) _ { 3 } {/tex}

Q 8.

Correct4

Incorrect-1

Given that {tex} ^ { E^\ominus } \mathrm { Fe } ^ { 2 + } \left| \mathrm { Fe } ^ { = - 0.44 \mathrm { V } ; E _ { \mathrm { } } ^ { \Theta } } \mathrm { Fe } ^ { 2 ^ { 2 + } } \right| \mathrm { Fe } ^ { 3 + } = - 0.77 \mathrm { v } {/tex}
If {tex} \mathrm { Fe } ^ { 2 + } , \mathrm { Fe } ^ { 3 + } {/tex} and {tex} \mathrm { Fe } {/tex} solid are kept together, then

A

{tex} \mathrm { Fe } ^ { 3 + } {/tex} increases

{tex} \mathrm { Fe } ^ { 3 + } {/tex} decreases

C

{tex} \mathrm { Fe } ^ { 2 + } , \mathrm { Fe } ^ { 3 + } {/tex} remain unchanged

D

{tex} \mathrm { Fe } ^ { 2 + } {/tex} decreases

Explanation

Q 9.

Correct4

Incorrect-1

The cell EMF is independent of the concentration of the species of the cell in

{tex} \mathrm { Fe } \overset{\ominus}| \mathrm { FeO } ( \mathrm { s } ) | \mathrm { KOH } ( \mathrm { aq } ) | \mathrm { NiO } ( \mathrm { s } ) | \mathrm { Ni } _ { 2 } \mathrm { O } _ { 3 } ( \mathrm { s } ) \overset{\oplus}| \mathrm { Ni } {/tex}

B

{tex} \mathrm { Pt } \left| \left( \mathrm { H } _ { 2 } \right) \right| \mathrm { HCl } | \left( \mathrm { Cl } _ { 2 } \right) \mathrm { Pt } {/tex}

C

{tex} \mathrm { Zn } \left| \mathrm { Zn } ^ { 2 + } \right| \mathrm { Cu } ^ { 2 + } | \mathrm { Cu } {/tex}

D

{tex} \mathrm { Hg } , \mathrm { Hg } _ { 2 } \mathrm { Cl } _ { 2 } | \mathrm { KCl } | \left| \mathrm { AgNO } _ { 3 } \right| \mathrm { Ag } {/tex}

Q 10.

Correct4

Incorrect-1

An electrochemical cell stops working after some time because

A

Electrode potential of both the electrodes become zero

Electrode potential of both the electrodes become equal

C

One of the electrode is eaten away

D

The reaction starts proceeding in opposite direction

Explanation

Q 11.

Correct4

Incorrect-1

The potential of the following cell at {tex} 25 ^ { \circ } \mathrm { C } {/tex} is

A

{tex} - 0.059 \mathrm V {/tex}

B

{tex} 0.050 \mathrm { V } {/tex}

{tex} - 0.59 \mathrm { V } {/tex}

D

{tex} 0.5 \mathrm { V } {/tex}

Explanation

Q 12.

Correct4

Incorrect-1

What volume of {tex} 0.1 \mathrm { N } \ \mathrm { FeSO } _ { 4 } {/tex} can be oxidized by a current of {tex}2{/tex} ampere hours?

{tex} 0.746 \mathrm { L } {/tex}

B

{tex} 7.46 \mathrm { L } {/tex}

C

{tex} 1.482 \mathrm { L } {/tex}

D

{tex} 0.373 \mathrm { L } {/tex}

Explanation


Q 13.

Correct4

Incorrect-1

{tex} 0.5 \mathrm { F } {/tex} of electricity is passed through {tex} 500 \mathrm { mL } {/tex} of copper sulphate solution. The amount of copper which can be deposited will be

A

{tex} 63.5 \mathrm g {/tex}

B

{tex} 31.75 \mathrm { g } {/tex}

{tex} 15.8 \mathrm g {/tex}

D

Unpredictable

Explanation

Q 14.

Correct4

Incorrect-1

The standard reduction potentials of {tex} \mathrm { Cu } ^ { 2 + } | \mathrm { Cu } {/tex} and {tex} \mathrm { Cu } ^ { 2 + } | \mathrm { Cu } ^ { \oplus } {/tex} are {tex}0.337 \mathrm V{/tex} and {tex}0.153 \mathrm V{/tex}, respectively. The standard electrode potential of {tex}\mathrm{Cu}{/tex} {tex}^ \oplus | \mathrm { Cu } {/tex} half cell is

A

{tex} 0.184 \mathrm { V } {/tex}

B

{tex} 0.827 \mathrm { V } {/tex}

{tex} 0.521 \mathrm { V } {/tex}

D

{tex} 0.490 \mathrm { V } {/tex}

Explanation

Q 15.

Correct4

Incorrect-1

The mass of gases evolved in STP by passing {tex} 0.1 \mathrm { A } {/tex} of current for {tex} 965 \mathrm { s } {/tex}, through an aqueous solution of potassium acetate

{tex} 0.06 \mathrm g {/tex}

B

{tex} 0.6 \mathrm { g } {/tex}

C

{tex} 6.0 \mathrm g {/tex}

D

{tex} 60 \mathrm g {/tex}

Explanation

Q 16.

Correct4

Incorrect-1

When a lead storage battery is discharged

A

{tex} \mathrm { SO } _ { 2 } {/tex} is evolved

B

Lead is formed

C

Lead sulphate is consumed

Sulphuric acid is consumed

Explanation

Q 17.

Correct4

Incorrect-1

Calculate the solubility product of {tex} \mathrm { Co } _ { 2 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] {/tex} in water at {tex} 25 ^ { \circ } \mathrm { C } {/tex} Given, conductivity of saturated solution of {tex} \mathrm { Co } _ { 2 } \left[ \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } \right] {/tex} is {tex} 2.06 \times 10 ^ { - 6 } \Omega ^ { - 1 } \mathrm { cm } ^ { - 1 } {/tex} and that of water used is {tex} 4.1 \times 10 ^ { - 7 } \Omega ^ { - 1 } \mathrm { cm } ^ { - 1 } {/tex}. The ionic molar conductivities of {tex} \mathrm { Co } ^ { 2 + } {/tex} and {tex} \mathrm { Fe } ( \mathrm { CN } ) _ { 6 } ^ { 4 - } {/tex} are {tex} 86.0 \Omega \mathrm { cm } ^ { 2 } \mathrm { mol } ^ { - 1 } {/tex} and {tex} 444.0 \Omega ^ { - 1 } \mathrm { cm } ^ { 2 } \mathrm { mol } ^ { - 1 } , {/tex} respectively

{tex} 7.87 \times 10 ^ { - 7 } {/tex}

B

{tex} 7.87 \times 10 ^ { - 6 } {/tex}

C

{tex} 7.87 \times 10 ^ { - 8 } {/tex}

D

{tex} 7.87 \times 10 ^ { - 9 } {/tex}

Explanation

Q 18.

Correct4

Incorrect-1

A reaction:
{tex} \frac { 1 } { 2 } \mathrm { H } _ { 2 } ( \mathrm { g } ) + \mathrm { AgCl } ( \mathrm { s } ) \rightleftharpoons \mathrm { H } ^ { \oplus } ( \mathrm { aq } ) + \mathrm { Cl } ^ { \ominus } ( \mathrm { aq } ) + \mathrm { Ag } ( \mathrm { s } ) {/tex}
Occurs in a galvanic cell. The structure of the cell will be

A

{tex} \operatorname { Ag } , \operatorname { AgCl } ( \mathrm { s } ) | \operatorname { KCl } ( \mathrm { sol } ) | \operatorname { Ag } \mathrm { NO } _ { 3 } ( \mathrm { sol } ) , \mathrm { Ag } {/tex}

B

{tex} \mathrm { Pt } , \mathrm { H } _ { 2 } ( \mathrm { g } ) | \mathrm { HCl } ( \mathrm { sol } ) | \mathrm { AgNO } _ { 3 } ( \mathrm { sol } ) , \mathrm { Ag } {/tex}

{tex} \mathrm { Pt } , \mathrm { H } _ { 2 } ( \mathrm { g } ) | \mathrm { HCl } ( \mathrm { sol } ) | \mathrm { AgCl } ( \mathrm { s } ) , \mathrm { Ag } {/tex}

D

{tex} \mathrm { Pt } , \mathrm { H } _ { 2 } ( \mathrm { g } ) | \mathrm { KCl } ( \mathrm { sol } ) | \mathrm { AgCl } ( \mathrm { s } ) , \mathrm { Ag } {/tex}

Explanation

Q 19.

Correct4

Incorrect-1

The standard EMF of decinormal calomel electrode is {tex} 0.268 \mathrm { V } . {/tex} The EMF is

A

{tex} - 0.298 \mathrm { V } {/tex}

{tex} 0.327 \mathrm { V } {/tex}

C

{tex} - 0.327 \mathrm { V } {/tex}

D

{tex} 0.298 \mathrm { V } {/tex}

Explanation

Q 20.

Correct4

Incorrect-1

Among Na, Hg, S, Pt, and graphite which can be used as electrode in electrolytic cell having aqueous solutions?

A

{tex} \mathrm { Na } {/tex} and {tex} \mathrm { S } {/tex}

B

{tex} \mathrm { Hg } , \mathrm { Pt } {/tex} and {tex} \mathrm { S } {/tex}

C

{tex} \mathrm { Na } , \mathrm { Hg } , {/tex} and {tex} \mathrm { S } {/tex}

{tex} \mathrm { Hg } {/tex}, {tex} \mathrm { Pt } {/tex}, and graphite

Explanation