$Z n | Z n^{2 +} (c_{1}) | | Z n^{2 +} (c_{2}) | Z n$ . For this cell $Δ$ G is negative if:

c_{1} = c_{2}

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c_{1} > c_{2}

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c_{2} > c_{1}

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Solution

The correct option is D $c_{2} > c_{1}$
$E_{c e l l} = E_{c e l l}^{o} - \frac{0.0591}{2} l o g \frac{[{Z n}^{2 +}] a n o d e}{[{Z n}^{2 +}] c a t h o d e}$
At anode $Z n \to {Z n}^{2 +} + 2 e^{-}$
At cathode ${Z n}^{2 +} + 2 e^{-} \to Z n$
$E_{c e l l} = 0 - \frac{0.0591}{2} l o g \frac{C_{1}}{C_{2}} △ C_{1} = - n F E_{c e l l}$
for $△ C_{1} = - v e$
$E_{c e l l} = + v e \Rightarrow C_{2} > C_{1}$

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