Pink colour of acidified `KMnO_(4)` is decolourised but there is no evolution of any gas.This may happen with the compound containing the following acid radical.

Options

A. `SO_(3)^(2-)`
B. `NO_(2)^(-)`
C. `S^(2-)`
D. All of these

Answer

D

Explanation

(A)`5SO_(3)^(2-)+2MnO_(4)^(-)+6H^(+) to2Mn^(2+)+5SO_(4)^(2-)+3H_(2)O`
(B)`2MnO_(4)^(-)+5NO_(2)^(-)+6H^(+) to2Mn^(2+)+5NO_(3)^(-)+3H_(2)O`
(C )`2MnO_(4)^(-)+H_(2)S+6H^(+) to2Mn^(2+)+5Sdarr+8H_(2)O`