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A substance on treatment with dil.H2SO4 ...

A substance on treatment with dil.`H_2SO_4` liberates a colourless gas which turns acidified dichromate solution green. The reaction indicates the presence of

A

`CO_3^(2-)`

B

`S^(2-)`

C

`SO_3^(2-)`

D

`NO_3^(-)`

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