Q11 / 199 · NTA Abhyas (NEET) 2020 · Chemistry · Electrochemistry

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

A
$C_{1} = C_{2}$
B
$C_{1} > C_{2}$
Correct answer
C
$C_{2} > C_{1}$
D
None of these

Solution

A n o d e: Z n \to Z n^{+ 2} (C_{1})

C a t h o d e: {Z n}^{+ 2} (C_{2}) \to Z n

K_{c} = \frac{(Z n^{+ 2}) A}{(Z n^{+ 2}) C} = (\frac{C_{1}}{C_{2}})

E = E^{o} - \frac{0.0591}{2} \log k_{c}

∆ G = - n F E

E = E ° - \frac{0.0591}{2} l o g \frac{C_{1}}{C_{2}} = \frac{0.0591}{2} l o g \frac{C_{2}}{C_{1}}

to make

Δ G = - v e

Δ E = + v e

hence,

C_{2} > C_{1}

Hence, the correct answer is option: 'C'.

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