First slide

Standard EMF of a cell

Question

$E_{{Ni}^{+ 2} / Ni}^{0} = - 0 .25 V; E_{Pt, \frac{1}{2} {Cl}_{2} / {Cl}^{-}}^{0} = + 1 .36 V$ then the spontaneous reaction involves

Moderate

A

Oxidation of Ni
B

Reduction of ${Ni}^{+ 2}$
C

Oxidation of ${Cl}^{-}$
D

All the above statements are correct

Solution

SRP of Nickel electrode is less .. It acts like anode
SRP of Chlorine electrode is high.. It acts like cathode
$\begin{array}{l} ∴ At anode Ni (s) \to {Ni}^{+ 2} (aq) + 2 e^{-} \\ At cathode {Cl}_{2} (g) + 2 e^{-} \to 2 {Cl}^{-} (aq) \\ Ni (s) + {Cl}_{2} (g) \to {Ni}^{+ 2} (aq) + 2 {Cl}^{-} (aq) \end{array}$

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