JEE Main 2022 — Redox Reactions Question with Solution

Hydrochloric acid (HCl) is usually not used in the process of titration because it reacts with the indicator potassium permanganate $\left({\mathrm{KMnO}}_4\right)$ that is used in the process. It reacts with ${\mathrm{KMnO}}_4$ solution and gets oxidized which further results in the liberation of chlorine gas according to the following reaction.

$2{\mathrm{KMnO}}_4+16\mathrm{HCl}\to 2{\mathrm{MnCl}}_2+2\mathrm{KCl}+8{\mathrm{H}}_2\mathrm{O}+5{\mathrm{Cl}}_2$

So, Both $\mathrm{A}$ and $\mathrm{R}$ are true and $\mathrm{R}$ is the correct explanation of $\mathrm{A}$