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A crystalline solid X reacts with dil HC...

A crystalline solid X reacts with dil HCI to liberate a gas Y. Y decolourises acidified KMnO4. When a gas 'Z' is slowly passed into an aqueous solution of Y, colloidal sulphur is obtained. X and Z could be, respectively

A

`Na_(2)S, SO_(3)`

B

`Na_(2)SO_(4), H_(2)S`

C

`Na_(2)SO_(3), H_(2)S`

D

`Na_(2)SO_(4), SO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`underset('X'" ")(Na_(2)SO_(3(s)))+2HCl_("(dil.)")rarr2NaCl+underset('Y'" ")(SO_(2(g))uarr)+H_(2)O`
`H_(2)O+SO_(2(g))rarr underset("(An aq. solution of Y)")underset("Sulphurous acid")(H_(2)SO_(3(aq.)))`
`H_(2)SO_(3)+underset('Z'" ")(2H_(2)S_((g)))rarr underset("(Colloidal)")(3S)+3H_(2)O`
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