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Roasting of sulphides gives the gas X as...

Roasting of sulphides gives the gas X as a by product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to repiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as reducing agent and its acid has never been isolated. The gas X is :-

A

`SO_(3)`

B

`H_(2)S`

C

`SO_(2)`

D

`CO_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
Roasting of zinc sulphide
`2ZnS +3O_(2) to 2ZnO+2SO_(2)(X)`
Its aqueous solution is acidic :
`SO_(2)+H_(2)O square square + H_(2)SO_(3)`
Sulphurous acid is known only in solution (it cannot be isolated).
Since it is easily oxidized by atmospheric oxygen to sulphuric acid, it acts as a strong reducing agent.
`2H_(2)SO_(3)+O_(2) square square to 2H_(2)SO_(4)`
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