# Calculate the equilibrium constant $K_c$ for the reaction . $3Sn^{4+} +2Cr \to 3Sn^{2+}+2Cr^{3+}$Given $E^0 =0.885\;V$
$\begin{array}{1 1} (a)\;90 \\ (b)\;1 \times 10^{90} \\ (c)\;0.885 \\(d)\;1 \times 10^{10} \end{array}$