Question

Find the order of magnitude of electrode potential ($E^\circ_{\text{M}^{2+}/\text{M}}$) of
Cr, V, Mn, Fe, Co

Hint:

The anomalous values in the 3d series $E^\circ_{\text{M}^{2+}/\text{M}}$ trend are crucial to remember: Mn is more negative than expected due to stable $d^5$ $\text{Mn}^{2+}$, and Zn is very negative due to stable $d^{10}$ $\text{Zn}^{2+}$.

Answer 1