The values of standard electrode potentials of ${Z n}^{2 +} / Z n$ and ${A g}^{+} / A g$ are $- 0.763 V$ and $+ 0.799 V$ respectively. The standard potential of the cell is:

2.361 V

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- 1.56 V

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- 0.036 V

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+ 0.036 V

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Solution

The correct option is A $2.361 V$
$Z n^{+ 2} + 2 e^{-} \to Z n$ $E_{z n^{+ 2} / z n}^{\circ} = - 0.763$
$A g^{+} + e^{-} \to A g$ $E_{A g}^{o} + / A g = + 0.799$
$2 A g^{+} + 2 e^{-} \to 2 A g$ $0.799 \times 2$
$Z n \to Z n^{+ 2} + 2 e^{-}$ $+ 0.763$
$2 A g^{+} + z n \to 2 A g + Z n^{+ 2}$
$= 1.598 + 0.763$
$E_{c e l l}^{o} = 2.361 V$

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[KCET 1993]

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