Question

what type of reaction could be considered to verify the law of conservation of mass?

Answer 1

The reaction which results for $\textbf{equal number of atoms }$in reactant as well as in product side is said to be verifying law of conservation of mass.

Since, balance Chemical equations also convey the law of conservation of mass.

Answer 2

It implies that energy canneither be created nor destroyed, but can be change from one form to another. The law of conservation of mass states that the total amount of mass remains constant in an isolated system in spite of any physical or chemical changes that may take place.