JEE Chemistry 2023 Question with Solution

Given: The listed processes are to be identified as endothermic or exothermic.

Find: The number of endothermic processes.

From the solution:

• $\mathrm{I}_2\,(g) \rightarrow 2\mathrm{I}\,(g)$ is an endothermic process (atomisation).
• $\mathrm{HCl}\,(g) \rightarrow \mathrm{H}\,(g) + \mathrm{Cl}\,(g)$ is an endothermic process (atomisation).
• $\mathrm{H}_2\mathrm{O}\,(l) \rightarrow \mathrm{H}_2\mathrm{O}\,(g)$ is an endothermic process (vaporisation).
• $\mathrm{C}\,(s) + \mathrm{O}_2\,(g) \rightarrow \mathrm{CO}_2\,(g)$ is an exothermic process (combustion).
• Dissolution of ammonium chloride in water is an endothermic process (dissolution).

Thus, the number of endothermic processes is $4$.

However, the listed options contain only four options while the solution clearly evaluates a fifth item (E). Because the option corresponding to $4$ is not present in the provided options, the MCQ answer cannot be mapped reliably to A/B/C/D.

Therefore, the extracted answer is marked AMBIGUOUS.