Combination Reaction

Identify the type of reaction taking place when water is added slowly to a small amount of calcium oxide in a beaker is: (I) Exothermic reaction. (II) Endothermic reaction (III) Combination Reaction (IV)Displacement reaction

You are given the following chemical equation : Mg(s) + CuO(s) to MgO(s) + Cu(s) This equation represents : decomposition reaction as well as displacement reaction (b) combination reaction as well as double displacement reaction. (c) redox reaction as well as displacement reaction. (d) double displacement reaction as well as redox reaction.