Question

Why are decomposition reactions called opposite of combination reactions? Wrire equations for these reactions.

Answer 1

In a combination reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances. Hence, the decomposition reactions are called opposite of combination reactions.

Ex.CaCO3 (s) ⇨ CaO (s) + CO2 (g) Decomposition reaction

H2 (g) + Cl2 ⇨ 2HCl (g) Combination reaction

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Answer 2

decomposition reaction called opposite to combination reaction because in decomposition reaction a single product gives more product but in combination reaction more reactant combine to give single product