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[X]+dil, H(2)SO(4) to [y] colourless suf...

`[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

A

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

B

`Cl^(-), HCl`

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
`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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