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# The correct cell reaction for given cell is $Sn/Sn^{+2}\parallel Ag^+/Ag$

$\begin{array}{1 1}(a)\;Sn+Ag^+\rightleftharpoons Sn^{+2}+Ag\\(b)\;Sn+2Ag^+\rightleftharpoons Sn^{+4}+2Ag\\(c)\;Sn^{+2}+2Ag\rightleftharpoons Sn^{+2}+2Ag\\(d)\;Sn+2Ag^+\rightleftharpoons Sn^{+2}+2Ag\end{array}$

$Sn\rightleftharpoons Sn^{+2}+2e^-$
$Ag^++e^-\rightleftharpoons Ag]\times 2$
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$\Rightarrow Sn+2Ag^+\rightleftharpoons Sn^{+2}+2Ag$
Hence (d) is the correct option.
edited Mar 21, 2014