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Electrochemical Series

The standard ...

Question

The standard electrode potentials of the electrodes are given below. Arrange them in decreasing order of ease of oxidation.
(a) Electrode - I, $E^{\circ} = - 2.89 V$
(b) Electrode - II, $E^{\circ} = - 0.93 V$
(c) Electrode - III, $E^{\circ} = 0.77 V$
(d) Electrode - IV, $E^{\circ} = - 2.93 V$
(e) Electrode - V, $E^{\circ} = - 1.67 V$

A

c > b > e > a > d

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B

d > a > e > b > c

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C

c > e > a > d > b

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D

c > b > a > d > e

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Solution

The correct option is B d > a > e > b > c
Standard electrode potentials are always reduction potentials unless mentioned otherwise.
Higher the value of reduction potential, easier it is for a species to undergo reduction reaction and more difficult it is to undergo the oxidation reaction. So higher negative value of reduction potential favours the oxidation reaction.

So decreasing order will be as $- 2.93 > - 2.89 > - 1.67 > - 0.93 > 0.77$
Hence, the answer is an option $B$ .

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Q. The standard electrode potentials of the electrodes are given below. Arrange them in decreasing order of ease of oxidation:

(a) E l e c t r o d e - I, E^{o} = - 2.89 V

(b) E l e c t r o d e - I I, E^{o} = - 0.16 V

(c) E l e c t r o d e - I I I, E^{o} = 0.77 V

(d) E l e c t r o d e - I V, E^{o} = - 2.93 V

(e) E l e c t r o d e - V, E^{o} = - 1.67 V

Q. Pairs of electrodes and their corresponding standard electrode potentials are given. Arrange the cells constructed by these electrodes in increasing order of emf values.
(a) Electrode

\to A, E^{\circ} =

- 2.92

V and Electrode

\to B, E^{\circ} =

- 2.71

V
(b) Electrode

\to C, E^{\circ} =

- 0.760

V and Electrode

\to D, E^{\circ} =

- 0.44

V
(c) Electrode

\to B, E^{\circ} =

- 2.71

V and Electrode

\to D, E^{\circ} =

- 0.44

V
(d) Electrode

\to A, E^{\circ} =

- 2.92

V and Electrode

\to C, E^{\circ} =

0.76

Q. Pairs of electrodes and their corresponding standard electrode potentials are given. Arrange the cells constructed by these electrodes in increasing order of emf values.

(a) E l e c t r o d e \to A, E^{o} = - 2.92 V

E l e c t r o d e \to B, E^{o} = - 2.71 V

(b) E l e c t r o d e \to C, E^{o} = - 0.760 V

E l e c t r o d e \to D, E^{o} = - 0.44 V

(c) E l e c t r o d e \to B, E^{o} = - 2.71 V

E l e c t r o d e \to D, E^{o} = - 0.44 V

(d) E l e c t r o d e \to A, E^{o} = - 2.92 V

E l e c t r o d e \to C, E^{o} = - 0.76 V

Q. From the standard electrode potential values of the electrodes given select an option representing their decreasing order discharge potential:

(a) A, E^{o} = 2.32 V

(b) B, E^{o} = 1.36 V

(c) C, E^{o} = 1.07 V

(c) D, E^{o} = 0.43 V

Given standard electrode potentials
$F e^{+ +} + 2 e^{-} \to F e; E^{\circ} = - 0.440 V$
$F e^{+ + +} + 3 e^{-} \to F e; E^{\circ} = - 0.036 V$
The standard electrode potential $(E^{\circ})$ for $F e^{+ + +} + e^{-} \to F e^{+ +}$ is

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