1.

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

Answer»

`SO_(3)^(2-)`,`SO_(2)`
`Ci^(-)`,HCL
`S^(-)`,`H_(2)S`
`CO_(3)^(2-)`,`CO_(2)`

SOLUTION :`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_(2)S` is evolved by the action of acid upon sulphide. However, `SO_(2)` has a burning sulphur smell which is IRRITATING. `H_(2)S` has rotten EGG like smell.
Hence, (A) is the correct answer.


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