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The standard reduction potential of $Cu^{+2}/Cu$ and $Ag^+/Ag$ electrode are 0.337 and 0.799Volt respectively for this positive emf galvanic cell,for what concentration of $Ag^+$ will be emf of cell at $25^{\large\circ}C$ be zero,if the concentration of $Cu^{+2}$ is 0.01M?

$\begin{array}{1 1}(a)\;1.37\times 10^9M\\(b)\;1.67\times 10^9M\\(c)\;1.57\times 10^9M\\(d)\;1.47\times 10^9M\end{array}$

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