What is an endothermic reaction ? Give an example.

Explanation

Endothermic reaction : The reaction in which heat is absorbed is called an endothermic reaction.
When `KNO_(3(S))` dissolves in water, there is absorption of heat during the reaction and the termperature of the solution falls.
`KNO_(3(S)) + H_(2)O_(I) + "Heat") to KNO_(3(aq))`