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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_2S, SO_3`

B

`Na_2SO_4, H_2S`

C

`Na_2SO_3 , H_2S`

D

`Na_2SO_4, SO_2`

Text Solution

Verified by Experts

The correct Answer is:
C
`Na_2SO_3 + 2HCl to 2NaCl + H_2O + SO_2`
` H_2O + SO_2 to H_2SO_3`
`H_2SO_3 + 2H_2S to 3S + 3H_2O`
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