The E^{circ} value for the Mn^{3+} / Mn^{2+} | vedclass

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(B) The standard electrode potential $E^{\circ}$ for the $Mn^{3+} / Mn^{2+}$ couple is significantly higher because the reduction of $Mn^{3+}$ to $Mn^

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$d^4$ to $d^5$ configuration

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(B) The standard electrode potential $E^{\circ}$ for the $Mn^{3+} / Mn^{2+}$ couple is significantly higher because the reduction of $Mn^{3+}$ to $Mn^{2+}$ involves a transition from a $3d^4$ configuration to a more stable $3d^5$ configuration.$Mn^{3+} ([Ar] 3d^4) + e^- \rightarrow Mn^{2+} ([Ar] 3d^5)$The $3d^5$ configuration is particularly stable due to the half-filled $d$-orbital subshell,which provides extra stability through exchange energy.In contrast,the reduction of $Cr^{3+} (3d^3)$ to $Cr^{2+} (3d^4)$ or $Fe^{3+} (3d^5)$ to $Fe^{2+} (3d^6)$ does not result in such a significant gain in stability.

The $E^{\circ}$ value for the $Mn^{3+} / Mn^{2+}$ couple is more positive than that of $Cr^{3+} / Cr^{2+}$ or $Fe^{3+} / Fe^{2+}$ due to change of

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