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During roasting of metal sulphides, a gas X is evolved as a by-product. X is a colourless gas with a suffocating smell of burning sulphur, contributes to severe damage to the respiratory system through acid rain, and its aqueous solution is acidic and behaves as a reducing agent. The corresponding acid of this gas has never been isolated. Identify gas X.

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

Correct answer: SO2

Solution

Gas X is sulfur dioxide (SO2), which is colorless, has a pungent smell reminiscent of burning sulfur, and is known to contribute to acid rain, causing respiratory issues. Its aqueous solution forms sulfurous acid, which is acidic and can act as a reducing agent.

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