Which of the following decomposition reactions is NOT a redox reaction?

Options

1. (1) Decomposition of dihydrogen monoxide
2. (2) Decomposition of sodium hydride
3. (3) Decomposition of potassium chlorate
4. (4) Decomposition of calcium carbonate

Correct Answer

(4) Decomposition of calcium carbonate

Explanation

CaCO3 → CaO + CO2 involves no change in oxidation states.

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