1.

[X]+dil, H_(2)SO_(4) to [y] colourless suffocating gas [y]+K_(2)Cr_(2)O_(7)+H_(2)SO_(4) to green colouration of solution Then, [x] and [y] are

Answer»

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

Solution :`underset(.X.)(SO_(3)^(2-))+"dil. "H_(2)SO_(4)rarr underset(.Y.)(SO_(2))+H_(2)O+SO_(4)^(2-)`
Green colouration on reaction with `K_(2)Cr_(2)O_(7)` and `H_(2)SO_(4)` shows that Y is `SO_(2)`.
`K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+underset(.Y.)(3SO_(2))rarr underset("(Green colour)")(Cr_(2)(SO_(4))_(3))+K_(2)SO_(4)and H_(2)O`
This CONFIRMS X is `SO_(3)^(2-)` ion and Y is `SO_(2)` which is colourless suffocating gas.


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