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Question: Which of the following statements is correct about equivalent weight of \(KMnO_{4}\)....

Which of the following statements is correct about equivalent weight of KMnO4KMnO_{4}.

A

It is one third of its molecular weight in alkaline medium

B

It is one fifth of its molecular weight in alkaline medium

C

It is equal to its molecular weight in acidic medium

D

It is one third of its molecular weight in acidic medium

Answer

It is one third of its molecular weight in alkaline medium

Explanation

Solution

It is one third of its molecular weight in alkaline medium because it gives 3 nascent oxygen in alkaline medium.

2KMnO4+H2O+3e2KOH+2MnO2+3[O]2KMnO_{4} + H_{2}O\overset{\quad + 3e^{-}\quad}{\rightarrow}2KOH + 2MnO_{2} + 3\lbrack O\rbrack

Equivalent weight = M3\frac{M}{3}.