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A substance on treatment with dilute H(2...

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 `:`

A

`CO_(3)^(2-)`

B

`S^(2-)`

C

`SO_(3)^(2-)`

D

`NO_(2)^(-)`

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