Why is $\ce{HCl}$ not used to make the medium acidic in oxidation reactions of $\ce{KMnO_4}$ in acidic medium?
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$\ce{HCl}$ is not used to make the medium acidic in oxidation reactions of $\ce{KMnO_4}$ in acidic medium. The reason is that if $\ce{HCl}$ is used, the oxygen produced from $\ce{KMnO_4 + HCl}$ is partly utilized in oxidizing $\ce{HCl}$ to $Cl,$ which itself acts as an oxidizing agent and partly oxidises the reducing agent.
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