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[X]+H2SO4 to [Y] a colourless gas with i...

`[X]+H_2SO_4 to [Y]` a colourless gas with irritating smell.
`[Y]+K_2Cr_2O_7+H_2SO_4 to `Green solution [X] and [Y] are :

A

`Cl^(-) , HCl`

B

`CO_(3)^(2-) , CO_(2)`

C

`S^(2-) , H_(2) S`

D

`SO_(3)^(2-) , SO_(2)`

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The correct Answer is:
D
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