Chapter 1

NCERT
Class 10
Science
Solutions
11. Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Promo GIF

Question:

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

Answer:

A reaction in which a reactant breaks down into two or more compounds is called decomposition reaction.

The reactions in which two or more elements or compounds react to form a new product are called combination reactions.

Equations (i) and (ii) the reactions are the same but opposite. Eq. (i) is decomposition of CaCO3 while Eq. (ii) is the combination (or formation) of CaCO3.

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