Question

The oxidation state of Mn in $KMnO_4$ changes by 3 units in which medium?

• A. Strongly acidic
• B. Strongly basic
• C. Aqueous neutral
• D. Weakly acidic

Answer 1

Answer: (C)

Aqueous neutral

Answer 2

The correct option is (C): Aqueous neutral
KMnO4 in the aqueous neutral medium that reduces to MnO$_{2}$
2KMnO$_{4}$ + H$_{2}$O $\to$ 2MnO$_{2}$ + 2KOH + $\frac{3}{2}$ O$_{2}$
∴ The oxidation state of Mn in KMnO4 that changes from +7 to +4 i.e., by 3 units.