Explanation:Decomposition Reaction:The reaction in which one reactant decomposes or breaks into two or more products is called a Decomposition reaction.A ? B + C2AgCI(s) \(\rm \xrightarrow{Sunlight} \) 2Ag(s) + CI2(g)Additional InformationCombination Reaction:The reaction in which two or more substances combine to form one product is called a Combination reaction.Example - CH4 (g) + 2O2 (g) ? CO2(g) + 2H2O(g)Displacement reaction: The reaction in which cation or anion from the reactant side is displaced to the products is called displacement reaction.A displacement reaction is also known as a metal displacement reaction.Example - CuO + H2 \(\rm \xrightarrow{Heat} \) Cu + H2OMetals of high reactivity displace the metals of low reactivity from their anions.Double displacement reaction: The reaction in which both cation and anion are displaced to the products is called a double displacement reaction.Example - Fe(s) + CuSO4 (aq) ? FeSO4 (aq) + Cu(s)Exothermic Reaction:The reaction in which heat is evolved is called an exothermic reaction.Cao + H2O ? Ca(OH) + Heat .Endothermic Reaction:The reaction which takes place by absorbing heat energy is called an endothermic reaction.A + B + Heat ? C + D