Which of the following is not a decomposition reaction?

CaCO₃ → CaO + CO₂

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H₂ + Cl₂ → 2HCl

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H₂CO₃ → H₂O + CO₂

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2KClO → 2KCl + 3O₂

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Solution

The correct option is B
H₂ + Cl₂ → 2HCl

In the reaction $H_{2} + C l_{2} \to$ 2HCl dihydrogen reacts with chlorine to form hydrogen chloride, this is not decomposition reaction. In a decomposition reaction, a single compound is broken into two or more elements.

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