Which gas decolourises potassium permanganate (KMnO 4 ) solution?

ICSE Class 10 Chemistry PYQ · 2025 Paper · Section A

1(i)1 Mark · 2025 · Section A · 2025 Paper

Which gas decolourises potassium permanganate (KMnO4) solution?

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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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