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Question : What does one mean by exothermic and endothermic reaction? Give example.

Answer»

SOLUTION :Exothermic reaction : Those reactions in which heat is evolved during the reaction are called exothermic reaction.
EX Burning of COAL.
` C(s) + O_2(g) to CO_2 (g) + ` Heat
Endothermic reaction : Those reactions in which heat is absorbed during the reaction are called endothermic reactions.
Ex: Decomposition of lime stone
` CaCO overset("heat")(to) CAO(s) + CO_2 (g)`


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