Question

how can we detect a SO2 is evolved

Answer 1

So2 is a colorless and pungent smell gas. It can be detected by using potassium permanganate solution. When So2 is passed through an acidifeid potassium permanganate solution, then it decolonises the soln as it reduces MnO4- ions to Mn2+ ions. SO2 give out suffocating smell which indicates its presence

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Answer 2

▪ SO2 gas has a burning sulphur smell.
▪ and it smell like rotten eggs or sewage smell.

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