Appeared in: 2025 (2 sets)
(a) (i) Account for the following :
(I) The $E^{\circ}_{\text{Mn}^{2+}/\text{Mn}}$ value for manganese is highly negative, whereas $E^{\circ}_{\text{Mn}^{3+}/\text{Mn}^{2+}}$ is highly positive.
(II) Actinoids show wide range of oxidation states.
(III) Transition metals have high melting points.