Question

Which among the following changes are exothermic or endothermic in nature?

(d) Dissolution of ammonium chloride in water

Answer 1

Exothermic reaction

• Exothermic reactions are reactions in which heat energy is released in the form of light or heat.

Endothermic reaction

• Endothermic reactions are reactions in which heat energy is absorbed.

Dissolution of ammonium chloride in water

• Ammonium chloride$\left({\mathrm{NH}}_4\mathrm{Cl}\right)$ is a very weak acid.
• It is soluble in water but heat is absorbed during dissolution in water.
• So, the dissolution of ammonium chloride is an endothermic reaction.