Question

why is decomposition reaction just opposite to combination reaction ????​

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, thedecomposition reactions are called oppositeof combination reactions.

Answer 2

Decomposition reaction is the reaction in which one reactabt decomposes to form two or more products.

For eg: - 2 FeSO4 -> Fe2O3 + SO2 + SO3

whereas combination reaction is the reaction in which two or more elements combine together to form one single product.

for eg :- CaO + H2O ---> Ca (OH)2

From this we can say that decomposition reaction is opposite of combination reaction.