Question

what is the relationship between decomposition and combustion reaction ?write an equation for each type? plz answer it fast its urgent .

Answer 1

in decomposition reaction compound break down in two or more substances
but
in combustion reaction it gives products co2 and water

Answer 2

Combination rxn. are those rxns. in which two or more simple substances are combined to form a single compound whereas the decomposition reaction is the opposite of combination rxn. in which a single compound splits into two or more simple substances.
For example:-Combination rxn.
2Mg + O2—2MgO
Decomposition reaction
2H2O—2H2 + O2.