Question

describe a reaction between quicklime and water

Answer 1

CaO+H2O=Ca(OH)2 is the reaction takes place when quick lime react with water

Answer 2

limestone when heated it break down into calcium oxide and carbon dioxide
calcium oxide is also called quicklime.
calcium oxide reacts with water to form calcium hydroxide also called slaked lime.
A lot of heat is produced in this reaction which is a exothermic reaction.