Which of the following is not a decomposition reaction?

CaCO₃ → CaO + CO₂

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2KClO₃ →2KCl + 3O₂

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Digestion of food in the body.

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H₂ + Cl₂ → 2HCl

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Solution

The correct option is D
H₂ + Cl₂ → 2HCl

H₂ + Cl₂ → 2HCl is not a decomposition reaction. In a decomposition reaction, one compound breaks into two or more substituent compounds or elements.
In the given reaction, the reactants combine to form a product. So,
H₂ + Cl₂ → 2HCl is a combination reaction.

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Similar questions

Classify each of the following reactions as combination, decomposition, displacement or double displacement reaction. [5 MARKS]

Conversion of $C a C O_{3}$ into $C a O$ as per the following reaction is an example of:

$C a C O_{3} (s) h e a t - - \to C a o (s) + C O_{2} (g)$

C a C O_{3} \to C a O + C O_{2}

2 K C l O_{3} \to 2 K C l + {3 O}_{2}

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