Question

Why are decomposition reactions called the opposite of combination reaction? Also equation for these reactions if you know

Answer 1

decomposition reactions are called the opposite of combination reaction because combination reaction - in this reaction, two or more substances react with each other to form a single substance.

Example :- Cao + H2O -----> Ca(OH)2

whereas in decomposition reaction it's actually the reverse of combination reaction. A single substance breaks to give simpler products.

Example - CaCo3 ------> CaO + CO2

Answer 2

A combination reaction is that in which two or more substances combine to form a new single substances under suitable conditions. A decomposition reaction is that in which a single substance decompose into two or more substances under suitable conditions