D And F Block Elements

\(\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}\) redox couple has less positive electron potential than \(\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}\) couple.

\(\mathrm{MnO}_4^{2-}\) is a strong oxidising agent but \(\mathrm{CrO}_4^{2-}\) is not.

The second and third series of transition elements have almost similar atomic radii.

The E\(\Upsilon\) value for \(\mathrm{Mn}^{3+} / \mathrm{Mn}^{2+}\) couple is much more positive than for \(\mathrm{Cr}^{3+} / \mathrm{Cr}^{2+}\) couple.