`KMnO_(4)` acts as an oxidising agent in acidic medium. The number of moles of `KMnO_(4)` that will be needed to react with one mole of sulphide ions in acidic solution is

Options

A. `2/5`
B. `3/5`
C. `4/5`
D. `1/5`

Answer

A

Explanation

The reaction of `KMnO_4` in which it acts as an oxidising agent in acidic medium is

5 moles of `S^(2-)` ions react with 2 moles of `KMnO_4`. So, 1 mole of `S^(2-)` ion will react with `2/5` moles of `KMnO_4`.