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Aqueous solution of a gas 'X' decolouris...

Aqueous solution of a gas 'X' decolourises an acidified `K_(2)Cr_(2)O_(7)` solution and on passing `H_(2)S` in the solution gives white turbity 'Y'. Here 'X' and 'Y' respectively are:

A

`SO_(2)` and S

B

`CO_(2)` and S

C

`SO_(2)` and `Cr(OH)_(3)`

D

`CO_(2)` and `Cr(OH)_(3)`

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The correct Answer is:
A
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