A chemical reaction in which heat energy is evolved is called an ____________ reaction.

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Solution

Based on the heat energy is absorbed or evolved, chemical reactions are classified into two types-
Exothermic reaction -A chemical reaction in which heat energy is evolved is called an exothermic reaction.
Endothermic reaction - A chemical reaction in which heat energy is absorbed is called an endothermic reaction.
Thus, a chemical reaction in which heat energy is evolved is called an exothermic reaction.

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