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

1. SO2
2. CO2
3. SO3
4. H2S

Correct answer: SO2

Solution

The gas X is SO2 (sulfur dioxide), which is produced during the roasting of sulfide ores. It is a colorless gas with a choking smell, forms acidic solutions in water, and acts as a reducing agent. Its acid, H2SO3, is unstable and cannot be isolated.

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