Appeared in: 2025 (2 sets)
(a) (i) Write the chemical equations involved in the preparation of potassium permanganate from pyrolusite ore (\text{MnO}_2).
(ii) Give reasons for the following :
(I) Sc (Atomic No. 21) salts are white.
(II) $E^\circ_{\text{Cu}^{2+}|\text{Cu}}$ is positive whereas $E^\circ_{\text{Mn}^{2+}|\text{Mn}}$ is negative.
(III) Transition metals have high enthalpies of atomisation.
OR