Question

1. Why are decomposition reactions also called as endothermic reactions?​

Answer 1

Answer:

because it need some energy to break a single compound into two different elements or metals

Answer 2

The Answer Is:

Dissociation reaction is called endothermic reaction as requires the input of heat energy in order to be broken down into its components. ....

So it's called Decomposition reaction & Exothermic Reaction.