Answer: Option (A) is the correct answer.
Explanation:
A chemical reaction where heat energy is absorbed by the reactant molecules is known as an endothermic reaction.
For example,
The value of = +ve for an endothermic reaction.
In an endothermic reaction, more heat is absorbed by the chemical bonds for the breakdown as compared to the heat released.
On the other hand, a chemical reaction in which heat energy is released by the reactant molecules is known as an exothermic reaction.
For example, is an exothermic reaction.
Thus, we can conclude that endothermic reaction is the type of reaction which is represented by A.