In the given electrochemical cell, at 298 K, the cell potential will increase when: A. Concentration of is increased. [2026]

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Solution

Q.
In the given electrochemical cell, $Ag (s) | AgCl (s) | {FeCl}_{2} (aq), {FeCl}_{3} (aq) | Pt (s)$ at 298 K, the cell potential $(E_{cell})$ will increase when: [2026]

A. Concentration of ${Fe}^{2 +}$ is increased.
B. Concentration of ${Fe}^{3 +}$ is decreased.
C. Concentration of ${Fe}^{2 +}$ is decreased.
D. Concentration of ${Fe}^{3 +}$ is increased.
E. Concentration of ${Cl}^{-}$ is increased.

Choose the correct answer from the options given below:

1 C, D and E only

2 B only

3 A and B only

4 A and E only

Ans.
(1)

${Cl}_{(aq)}^{-} + {Ag}_{(s)} + {Fe}_{(aq)}^{3 +} \to {Fe}_{(aq)}^{2 +} + {AgCl}_{(s)}$

$E_{cell} = E_{cell}^{\circ} - \frac{0.059}{1} \log \frac{[{Fe}^{2 +}]}{[{Cl}^{-}] [{Fe}^{3 +}]}$

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