Question

Give one example of an exothermic combination reaction

Answer 1

For example barium metal and fluorine gas will combine in a highly exothermic reaction to form the salt barium fluoride:

Answer 2

It is a combination reaction because two compounds on reaction give one product.
As heat is also evolved during the process, thus it is also an example of exothermic reaction.

H2S + Cl2 -----> 2HCL + S.