Question

why quicklime when disolved in water become hot

Answer 1

i hope it helps u.
Limestone when heated, it breaks down to form calcium oxide and carbon dioxide. Calcium oxidereacts with water to form calcium hydroxide, also called slaked lime. A lot of heat (exothermic reaction) is produced in the reaction, which may even cause the water to boil.
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Answer 2

because it is exothermic reaction . in this reaction CO2 gas is liberated so it becomes hot ...