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An inorganic substance evolves oxygen on heating, makes an acidic potassium iodide solution turn violet, and decolourises acidified potassium permanganate. Which substance is it?

1. SO3
2. KNO3
3. H2O2
4. All of the above

Correct answer: H2O2

Solution

H2O2, or hydrogen peroxide, decomposes upon heating to release oxygen, reacts with potassium iodide to form iodine which turns the solution violet, and reduces potassium permanganate, leading to its decolorization.

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