When a salt is heated with dil `H_(2)SO_(4)` and `KMnO_(4)` solution the pink colour of `KMnO_(4)` is dicharged, the mixture may contain

Options

A. a sulphite
B. a carbonate
C. a nitrate
D. a bicarbonate

Answer

A

Explanation

`SO_(3)^(2-)` reduces `KNnO_(4)` to colourless `Mn^(2+)`
`5SO_(3)^(2-) + 2MnO_(4)^(-) + 6H^(+) to 2Mn^(2+) +5SO_(4)^(2-) +3H_(2)O`