`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 ion in acidic solution is -

Options

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

Answer

A

Explanation

`2MnO_(4)^(-)+5S^(2)+16H^(+)rarr 2Mn^(2+)+5S+8H_(2)O`
`therefore` 1 mole of `S^(2-)` will react with 2/5 moles of `KMnO_(4)` for ion - electron equation.