When a salt is heated with dilute `H_(2)SO_(4) " and " KMnO_(4)` solution, the pink colour of `KMnO_(4)` is discharged, the salt is :

Options

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

Answer

A

Explanation

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