[X]+H(2)SO(4) rarr [Y] a colourless gas ...

`[X]+H_(2)SO_(4) rarr [Y]` a colourless gas with irritating smell `[Y] + K_(2)Cr_(2)O_(7) + H_(2)SO_(4) rarr` green solution `[X]` and `[Y]` are

A

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

B

`Cl^(-) , HCl`

C

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

D

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

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