Is the reaction between quick lime and waterendothermic or exothermic?

The reaction of calcium oxide with water to form calcium hydroxide is a highly exothermic reaction (gives off heat).

Calcium oxide + water → calcium hydroxide

CaO + H2O → Ca(OH)2

A lot of heat is produced in the reaction, which may even cause the water to boil. Hence, it is a combination reaction as well as an exothermic reaction.

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