Question

give one example of displacement, decomposition and combination reactions with explanation

Answer 1

Zn+Cuso4 ⇒Znso4 + Cu

this is a displacement reaction

displacement reaction is a reaction in which the lower reactive metal is displaced by the higher reactive metal

2Mg + O2 ⇒ 2MgO

this is a combination reaction

combination reaction is a reaction in which two or more reactants combines to form a single product

CaCo3⇒(with heat) Cao + Co2

this is a decomposition reaction

decomposition reaction is a reaction in which a single compound breaks down  into two or more simpler substances.