Question

Potassium permanganate acts as an oxidising agent in acidic, alkaline as well as neutral media. Which among the following statements is incorrect?

• A. $N=M/5$ (in acid medium)
• B. $N=M/3$ (in alkaline medium)
• C. $N=M/3$ (in neutral medium)
• D. $N=M$ (in alkaline medium)

Answer 1

Answer: (A)

$N=M/5$ (in acid medium)

In acidic medium:

$8H^{+}+Mn{O}_4^{2-}+5e^{-}\to M{n}^{2+}+4H_{2}O$

$N=M/5$ (in acid medium)

In basic medium:

$MnO{4}^{-}+e^{-}\to Mn{O}_4^{2-}$

$N=M$ (in alkaline medium).

Hence option A,D are correct.