In a galvanic cell, the salt bridge

Does not participate chemically in the cell reaction.

Stops the diffusion of ions from one electrode to another.

Is necessary for the occurrence of the cell reaction.

Ensures mixing of the two electrolytic solutions.

MEDIUM

JEE Main/Advance

IMPORTANT

Earn 100

When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is:

50% studentsanswered this correctly

Important Questions on Electrochemistry

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 51

The anodic half-cell of lead-acid battery is recharged using electricity of

0 .05

Faraday. The amount of

{PbSO}_{4}

electrolyzed in

g

during the process is: (Molar mass of

{PbSO}_{4} = 303 g {mol}^{- 1}

)

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 52

If the standard electrode potential for a cell is

2 V

300 K,

the equilibrium constant

(K)

for the reaction.

Zn (s) + {Cu}^{2 +} (aq) ⇌ {Zn}^{2 +} (aq) + Cu (s)

300 K

is approximately:

(R = 8 {JK}^{- 1} {mol}^{- 1}, F = 96000 C {mol}^{- 1})

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 53

Consider the following reduction processes

{Zn}^{2 +} + 2 e^{-} \to Zn (s); E^{o} = - 0.76 V

{Ca}^{2 +} + 2 e^{-} \to Ca (s); E^{o} = - 2.87 V

{Mg}^{2 +} + 2 e^{-} \to Mg (s); E^{o} = - 2.36 V

{Ni}^{2 +} + 2 e^{-} \to Ni (s); E^{o} = - 0.25 V

The reducing power of the metals increases in the order

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 54

In the cell,

Pt (s) |H_{2} (g, 1 bar)| HCl (aq) |AgCl (s)| Ag (s) |Pt (s),

the cell potential is

0 .92 V

when a

10^{- 6}

molar

HCl

solution is used. The standard electrode potential of

Ag | AgCl | {Cl}^{-}

electrode is:

(Given,

\frac{2 .303 RT}{F} = 0 .06 V

298 K

)

MEDIUM

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 55

For the cell

Zn (s) | {Zn}^{2 +} (aq) | | M^{x +} (aq) | M (s),

different half cells and their standard electrode potential are given bellow:

$M^{x +} (aq) / M (s)$	${Au}^{3 +} (aq) / Au (s)$	${Ag}^{+} (aq) / Ag (s)$	${Fe}^{3 +} (aq) / {Fe}^{2 +} (aq)$	${Fe}^{2 +} (aq) / Fe (s)$
$E^{o} M^{x +} / M (s) in Volt$	$1.40$	$0.80$	$0.77$	$- 0.44$

E_{{Zn}^{2 +} / Zn}^{o} = - 0 .76,

Which cathode will give a maximum value of

E °_{cell}

per electron transferred?

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 56

Given the equilibrium constant:

K_{c}

of the reaction:

Cu (s) + 2 {Ag}^{+} (aq) \to {Cu}^{2 +} (aq) + 2 Ag (s)

10 \times 10^{15}

, calculate the

E_{cell}^{o}

of this reaction at

298 K

[2 .303 \frac{RT}{F} at 298 K = 0 .059 V]

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 57

The standard electrode potential $E^{o}$ and its temperature coefficient $(\frac{dE}{dT})$ for a cell are $2 V$ and $- 5 {\times10}^{- 4} V K^{- 1}$ at $300 K$ , respectively. The reaction is $Zn (s) + {Cu}^{2 +} (aq) \to {Zn}^{2 +} (aq) + Cu (s)$ . The standard reaction enthalpy $(Δ_{r} H^{-})$ at $300 K$ in $m o l^{- 1}$ is

$[$ Use $R = 8 J K^{- 1} {mol}^{- 1}$ and $F =96,500 C {mol}^{- 1}]$

HARD

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Chemistry>Chapter 9 - Electrochemistry>Exercise-3>Q 58

\land_{m}^{o}

for

NaCl, HCl

and

NaA

are

126.4, 425.9

and

100 .5 S {cm}^{2} {mol}^{- 1}

respectively. If the conductivity of

0 .001 M HA

5 \times 10^{- 5} S {cm}^{- 1}

, degree of dissociation of

HA

When 9.65 ampere current was passed for 1.0 hour into nitrobenzene in acidic medium, the amount of p-aminophenol produced is:

Important Questions on Electrochemistry

Learn and Prepare for any exam you want !