\[ \begin{array}{l} \mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{M...
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\begin{array}{l}
\mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+}+5 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O} ; \mathrm{E}^{0}=1.51 \mathrm{~V} \\
\mathrm{MnO}_{2}+4 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Mn}^{2+}+2 \mathrm{H}_{2} \mathrm{O} ; \mathrm{E}^{0}=1.23 \mathrm{~V} \\
\mathrm{E}_{\mathrm{MnO}_{4}^{-} \mid \mathrm{MnO}_{2}}^{0} \text { is }
\end{array}
\]
\( \mathrm{E}_{\mathrm{MnO}_{4}^{-} \mid \mathrm{MnO}_{2}}^{0} \) is
(a) \( 1.70 \mathrm{~V} \)
(b) \( 0.91 \mathrm{~V} \)
(c) \( 1.37 \mathrm{~V} \)
(d) \( 0.548 \mathrm{~V} \)
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