Question

give one example each to displacement decomposition and combination reaction with explanationgive this question ans if you have power

Answer 1

displacement reaction:
the type of reaction in which mutual exchange of ions takes place .
Pb(No3)2 + 2 KI ------) PbI2 + 2 KNO3.

decomposition reaction :
the reaction in which one reactant decomposes to produce two or more products.
thermal_
FeSO4-------(on heating)----) Fe2O3 + SO2+ SO3.
electrolytic_
H2O----(on passing current)---) H2+O2
photochemical-
AgBr------(light)---)Ag+ Br2

combination :
the reaction in which two ore more reactants combine to give one product.
2 Mg+O2----)2 MgO