Question

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

Answer 1

In decomposition reaction a single substance gets decomposed into many simpler substances but in combination reaction 2 or more than 2 reactants combine together to form a product

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Answer 2

In combination reaction, 2 reactants combine to form a single product.
Example: 2Mg + O > 2MgO

In decomposition reaction, 2 product is formed by reaction of a single reactant.
Example: 2H2O > 2H2 + O2

Hence, ...