Question

how are decomposition reactions related to combination reactions?

Answer 1

Decomposition reaction is related to combination reaction by many ways but out of them I'm going to explain one way-

Decomposition reactions are just opposite of combination reactions.

Example- 2Hg(Mercury) + O2 ------› HgO

2HgO ------› 2Hg +O2

I hope this will help you

Answer 2

Answer:

The relation is that they are opposite of one another

Explanation:

The whole answer is given in the following attachment.

HOPE IT HELPS YOU!!