Given: C o 3 + + e - → C o 2 + ; E ° = + 1.81 V P b 4 + + 2 e - → P b 2 + ; E ° = + 1.67 V C e 4 + + e - → C e 3 + ; E ° = + 1.61 V B i 3 + + 3 e - → B i ; E ° = + 0.20 V Oxidizing power of the species will increase in the order:

B i 3 + < C e 4 + < P b 4 + < C o 3 +

C o 3 + < C e 4 + < B i 3 + < P b 4 +

C o 3 + < P b 4 + < C e 3 + < B i 3 +

C e 4 + < P b 4 + < B i 3 + < C o 3 +

HARD

Earn 100

A solution of copper sulfate is to be stored in a container made of a metal. Which of the following metals is/are suitable for this purpose?
(i) silver
(ii) lead
(iii) zinc
(The standard electrode potentials for ${Cu}^{2 +}, {Ag}^{+}, {Pb}^{2 +}$ and ${Zn}^{2 +}$ are $0.34 V, 0.80 V, - 0.13 V$ and $- 0.76 V,$ respectively.)

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Important Questions on Electrochemistry

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

In which of the following cases a chemical reaction is possible?

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Among the following metals, the strongest reducing agent is

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

250 mL

of a waste solution obtained from the workshop of a goldsmith contains

0.1 M {AgNO}_{3}

and

0.1 M AuCl

. The solution was electrolyzed at

2 V

by passing a current of

1 A

for

15

minutes. The metal/metals electrodeposited will be :

(E_{{Ag}^{+} / Ag}^{0} = 0.80 V, E_{{Au}^{+} / Au}^{0} = 1.69 V)

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Given

E_{{Cr}^{3 +} / Cr}^{o} = - 0.74 {V;  E}_{{MnO}_{4}^{-} / {Mn}^{2 +}}^{o} = 1.51 V

E_{{Cr}_{2} O_{7}^{2 -} / {Cr}^{3 +}}^{o} = 1.33 {V;   E}_{{Cl}_{2} | {Cl}^{-}}^{o} = 1.36 V

Based on the data given above, strongest oxidising agent will be:

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

The metal that cannot be obtained by the electrolysis of an aqueous solution of its salt is

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

For the cell $Cu (s) |{Cu}^{2 +} (aq) (0.1 M) ‖ {Ag}^{+} (aq) (0.01 M)| Ag (s)$ the cell potential $E_{1} = 0.3095 V$ . For the cell $Cu (s) |{Cu}^{2 +} (aq) (0.01 M) ‖ {Ag}^{+} (aq) (0.001 M)| Ag (s)$ the cell potential $= x \times 10^{- 2} V .$ Find value of x (Round off the Nearest Integer).

[ Use $: \frac{2.303 RT}{F} = 0.059 J$ ]

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Given:

C o^{3 +} + e^{-} \to C o^{2 +}; E ° = + 1.81 V

{P b}^{4 +} + {2 e}^{-} \to {P b}^{2 +}; E ° = + 1.67 V

C e^{4 +} + e^{-} \to C e^{3 +}; E ° = + 1.61 V

{B i}^{3 +} + {3 e}^{-} \to B i; E ° = + 0.20 V

Oxidizing power of the species will increase in the order:

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

The standard electrode potential of

M^{2 +} / M

is positive for

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

The standard electrode potentials

(E_{M^{+} / M}^{o})

of four metals

A, B, C

and

D

are

- 1 .2 V,

0 .6 V

0 .85 V

and

- 0 .76 V

, respectively. The sequence of deposition of metals on applying potential is

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

The position of some metals in the electrochemical series in decreasing electropositive character is

Mg > Al >

Zn > Cu > Ag .

The change expected on stirring the solution of aluminium nitrate with copper spoon is

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Following four colourless solutions of salts have been kept in different test tubes and a copper strip was dipped in each. Which solution will turn blue in the end?

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Upon dipping a copper rod, the aqueous solution of the salt that can turn blue is:

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Two identical beakers contain concentrated $HCl$ solution at $298 K$ . In the first beaker solid $Cu$ is added, while in the second beaker solid $Zn$ is added. Which of the following will be observed?

$[E^{0} ({Zn}^{2 +} / Zn) = - 0.76 V; E^{0} ({Cu}^{2 +} / Cu) = + 0.34 V]$

HARD

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Which of the following has least tendency to liberate

H_{2}

from mineral acids?

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

At $298 K$ , the standard electrode potentials of ${Cu}^{2 +} / Cu, {Zn}^{2 +} / Zn, {Fe}^{2 +} / Fe$ and ${Ag}^{+} / Ag$ are $0.34 V$ , $- 0.76 V$ , $- 0.44 V$ and $0.80 V$ , respectively.

On the basis of standard electrode potential, predict which of the following reaction cannot occur?

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

Given that,

$E_{O_{2} / H_{2} O}^{o} = + 1 .23 V;$
$E_{S_{2} O_{8}^{2 -} / {SO}_{4}^{2 -}}^{o} = 2 .05 V$
$E_{{Br}_{2} / {Br}^{-}}^{o} = + 1.09 V;$
$E_{{Au}^{3 +} / Au}^{o} = 1 .4 V$

The strongest oxidizing agent is

EASY

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

The standard reduction potentials (in V) of a few metal ion/metal electrodes are given below.

{Cr}^{3 +} / Cr = - 0 .74; {Cu}^{2 +} / Cu = + 0 .34; {Pb}^{2 +} / Pb = - 0 .13; {Ag}^{+} / Ag = + 0 .8 .

The reducing strength of the metals follows the order

MEDIUM

Chemistry>Physical Chemistry>Electrochemistry>Electrochemical Series and its Applications

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:

A solution of copper sulfate is to be stored in a container made of a metal. Which of the following metals is/are suitable for this purpose? (i) silver (ii) lead (iii) zinc (The standard electrode potentials for Cu2+,Ag+,Pb2+ and Zn2+ are 0.34 V,0.80 V,-0.13 V and -0.76 V, respectively.)

Important Questions on Electrochemistry

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