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For the given reactions:
\[
\begin{array}{l}
\mathrm{Sn}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Sn} \\
\mathrm{Sn}^{4+}+4 \mathrm{e}^{-} \rightarrow \mathrm{Sn}
\end{array}
\]
The electrode potentials are; \( \mathrm{E}_{\mathrm{Sn}^{2+} / \mathrm{Sn}}^{0}=-0.140 \mathrm{~V} \) and \( \mathrm{E}_{\mathrm{Sn}^{4+} / \mathrm{Sn}}^{\mathrm{o}}=-0.010 \mathrm{~V} \). The magnitude of standard electrode potential for \( \mathrm{Sn}^{4+} / \mathrm{Sn}^{2+} \) i.e. \( \mathrm{E}_{\mathrm{Sn}^{4+} / \mathrm{Sn}^{2+}}^{\mathrm{o}} \) is \( \times 10^{-2} \mathrm{~V} \). (Nearest integer)
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