Chemistry
Which gas decolourises potassium permanganate (KMnO4) solution?
- Sulphur dioxide
- Ammonia
- Hydrogen chloride
- Carbon dioxide
Analytical Chemistry
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Answer
Sulphur dioxide
Reason — Sulphur dioxide gas turns acidified potassium permanganate from pink to clear colourless.
2KMnO4 + 2H2O + 5SO4 ⟶ K2SO4 + MnSO4 + H2SO4
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