Question

In commercial method of preparation of potassium permanganate from $Mn{O}_2$ which of the following species undergoes electrolytic oxidation?

• A. $Mn{O}_2$
• B. $Mn{O}_4^{2-}$
• C. $Mn{O}_2^{-}$
• D. None of the above

Answer 1

The correct option is B $Mn{O}_4^{2-}$

Preparation of potassium permanganate by commercial method:

Step-1: Alkaline oxidative fusion of $Mn{O}_2$
$Mn{O}_2\underset{\text{oxidised with air or}KN{O}_3}{\overset{\text{Fused with KOH}}{\to }}Mn{O}_4^{2-}$

Step-2: Electrolytic oxidation of manganate (Vl)
$Mn{O}_4^{2-}\underset{\text{in alkaline solution}}{\overset{\text{Electrolytic oxidation}}{\to }}Mn{O}_4^{-}$

Hence, option (b) is correct.