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CBSE Class 10 Science Question 11 of 28

Chemical Reactions and Equations — Question 11

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Question

Question 11

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions?

Answer

In a decomposition reaction, a single reactant breaks down to give simpler products.

CaCO3 →Δ\xrightarrow{\Delta} CaO + CO2

In a combination reaction, a single product is formed from two or more reactants.

CaO + H2O ⟶ Ca(OH)2

Hence, we can say that the decomposition reaction is opposite of combination reaction.