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A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?

1. S
2. H
3. Cl
4. C

Correct answer: Cl

Solution

In this reaction, potassium chlorate (KClO3) decomposes, and chlorine in KClO3 undergoes a significant change in oxidation state from +5 in ClO3⁻ to -1 in Cl⁻. This is the maximum change in oxidation number compared to other elements.

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