Chemical reaction in which heat is absorbed are called ____________.

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Solution

Endothermic reaction - Chemical reactions in which heat is absorbed are called endothermic reactions.
Example - Formation of nitrogen monoxide by the combination of nitrogen and oxygen at a very high temperature of about 3000 $° C$ .
$\underset{Nitrogen}{N_{2}} + \underset{Oxygen}{O_{2}} \overset{3000 ° C}{\to} \underset{Nitrogen monooxide}{2 NO}$
Thus, chemical reactions in which heat is absorbed are called endothermic reactions.

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