Question

The statement given below is incorrect. Write the correct statement.

The decomposition of ammonium chloride into ammonia and oxygen is an exothermic reaction.

Answer 1

Given statement: The decomposition of ammonium chloride(NH₄Cl) into ammonia (NH₃) and oxygen(O₂) is an exothermic reaction.

Endothermic reaction: It is defined as the reaction which is feasible only when external energy is added.

• These types of reactions are non-spontaneous in nature.
• Non-Spontaneous reaction: The reactions require external energy in order to take place and do not occur on their own.

Exothermic reaction: It is defined as the reactions in which energy is released in the form of heat.

• These types of reactions are spontaneous in nature.
• Spontaneous reaction: The reactions which occur on their own.

Decomposition of Ammonium chloride: The decomposition of ammonium chloride does not decompose into Ammonia(${\mathrm{NH}}_3$) and Oxygen(${\mathrm{O}}_2$).

It decomposes into Ammonia(NH₃) and Hydrogen chloride (HCl)

• $\underset{\mathrm{Ammonium}\mathrm{Chloride}}{{\mathrm{NH}}_4\mathrm{Cl}\left(\mathrm{s}\right)}\to \underset{\mathrm{Ammonia}}{{\mathrm{NH}}_3\left(\mathrm{g}\right)}+\underset{\mathrm{Hydrogen}\mathrm{Chloride}}{\mathrm{HCl}\left(\mathrm{g}\right)}$

Also, it is a type of endothermic reaction, not an exothermic reaction. Heat will be absorbed in the reaction.

The decomposition of ammonium chloride into Ammonia and Hydrogen chloride is an endothermic reaction.