1.

X+H_2SO_4 to Y (a colourless gas with pungent smell) Y+K_2 Cr_2O_7 +H_2SO_4to Green solution

Answer»

 `X is SO_(3)^(2-)`
`X is CO_(3)^(2-)`
Y is `H_2S`
Y is `SO_2`

ANSWER :A::D


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