The $\mathrm{E}_{\mathrm{M}}^0{ }^{3+}{ }_{\mathrm{Md}}{ }^{2+}$ values for $\mathrm{Cr}, \mathrm{Mn

Question

The $\mathrm{E}_{\mathrm{M}}^0{ }^{3+}{ }_{\mathrm{Md}}{ }^{2+}$ values for $\mathrm{Cr}, \mathrm{Mn}, \mathrm{Fe}$ and Co are $-0.41,+1.57,+0.77$ and +1.97 V respectively. For which one of the metals, the change in oxidation state from +2 to +3 is easiest?

Professor PC Thomas Classes · Answer

The most negative $E^0_{\mathrm{M}^{3+}/\mathrm{M}^{2+}}$ value indicates the easiest oxidation from +2 to +3. Cr is $-0.41$ V.