A substance on treatment with dilute `H_(2)SO_(4)` liberates a colourless gas which produces `(I)` turbidity with baryta water and `(ii)` turns acidified dichromate solution green. The reaction indicates the presence of `:`

Options

A. `CO_(3)^(2-)`
B. `S^(2-)`
C. `SO_(3)^(2-)`
D. `NO_(2)^(-)`

Answer

C

Explanation

`SO_(3)^(2-)+Ba(OH)_(2)rarrBaSO_(3)darr("white")+2OH^(-)`
`3SO_(2)+Cr_(2)O_(7)^(2-)+2H^(+)rarr2Cr^(3+)("green colour solution ")+3SO_(4)^(2-)+H_(2)O`.