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Given below are the half-cell reactions
\[\mathrm{Mn}^{2+}+2 e^{-} \longrightarrow \mathrm{Mn} ; E^{\circ}=-1.18 \mathrm{eV}\]
\[2\left(\mathrm{Mn}^{3+}+e^{-} \longrightarrow \mathrm{Mn}^{2+}\right) ; E^{\circ}=+1.51 \mathrm{eV}\]
The \( E^{\circ} \) for \( 3 \mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}+2 \mathrm{Mn}^{3+} \) will be
(a) \( -2.69 \mathrm{~V} \); the reaction will not occur
(b) \( -2.69 \mathrm{~V} \); the reaction will occur
(c) \( -0.33 \mathrm{~V} \); the reaction will not occur
(d) \( -0.33 \mathrm{~V} \); the reaction will occur
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