For which one of the following elements, $M^{3+} \mid M^{2+}$ standard electrode potential is more positive?

Question

Aicharya · Accepted Answer

The reduction potential of $\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}$ is most positive, because of stability of the half-filled $d$-subshell in $\mathrm{Mn}^{2+}$. The $\mathrm{V}^{2+}$ has lowest value due to the stability of $\mathrm{V}^{2+}$ as it is half-filled.

For which one of the following elements, $M^{3+} \mid M^{2+}$ standard electrode potential is more positive?

Solution