In strongly alkaline medium, the equivalent mass of `KMnO_(4)` is --------, where formula mass.

Options

A. M/6
B. M
C. M/3
D. M/5

Answer

B

Explanation

In a redox reaction in strongly alkaline medium, `KMnO_(4)` produces `K_(2)MnO_(4)`. Since the oxidation number decreases form `(+7)` to `+6`, the equivalent mass is M/1 or M. In a redox reaction in acidic medium, equivalent mass is M/5 as `KMnO_(4)` is reduced to `Mn^(2+)` ions. In a redox reaction in neutral as well as alkaline medium, `KMnO_(4)` produces `MnO_(2)`. Thus, its equivalent mass will be M/3.