Question

define decomposition reaction? give one example of thermal decomposition and electrolytic decomposition

Answer 1

the splitting of one substance or element into two is known as decompostion reaction..
e.g..CO2----C+O2

Answer 2

Those reaction in which a compound splits into 2 or more simpler substances are known as decomposition reaction.
eg - thermal decomposition
Ca CO3 ------------ CaO +CO2
heat
electrolytic decomposition
2H2O ---------------- 2H2 + O2
electricity