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[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`1

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
C
`SO_(2)` and `H_(2)S` both being reducing agents, can turn acidified dichromate solution green. `SO_(2)` can be obtained by the action of acid upon sulphite while `H_2S` is evolved by the action of acid upon sulphide.
However `SO_(2)` has burning sulphur smell which is irritating .`H_(2)S` has rotten egg like smell.
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