Which of the following statements is corrected about equivalent weight of `KMnO_(4)`?

Options

A. It is one third of its molecular weightin alkaline
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

A

Explanation

It is one-third of its molecular weight in alkaline medium because it gives 3 nascent oxygen in alkaline medium.
`2KMnO_(4) + H_(2) O overset(+3 e^(-))rarr 2KOH + 2MnO_(2) + 3 [O]`
`:.` Equivalent weight `= (M)/(3)`