Question

why are decomposition reaction called opposite combination reaction? write equation of the reaction​

Answer 1

Answer: 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, the decomposition reactions are called opposite of combination reactions

Answer 2

Answer:

In decomposition reaction a single reactant break down to give simple product while in combination reaction two or more reactants react to give a single product that is why decomposition reaction called opposite combination reaction

Equation -) combination reaction

H2 + O2 -----------> H2O

Decomposition reaction

AgBr + heat --------> Ag + Br2