Q. Roasting of sulphides gives the gas X as a byproduct. This is a colourless gas with choking smell of burnt sulphur and causes 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
A) H₂S
B) SO₂
C) CO₂
D) SO₃
Explanation
[Solution from source] Roasting sulphide ores gives SO₂, a colourless gas with the choking smell of burning sulphur that contributes to acid rain. Its aqueous solution, H₂SO₃, is acidic and reducing but has never been isolated. H₂S smells of rotten eggs, and SO₃ is not produced as the main by-product. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.