CaO + H2O → Ca (OH)2 is an example of which of the reactions?

Answer: 

Explanation

The reaction of Cao + H₂O → Ca (OH)₂ is described as a combination reaction, in which calcium oxide and water combine to form a single product which is calcium hydroxide.

1. Here, two reactants combine to form one product. Halogens and oxygen undergo a combination reaction with other elements as they are highly reactive elements.
2. It liberates heat therefore; this is an exothermic reaction.