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  • Why is {HCl} not used to make the medium acidic in oxidation reactions of {KMnO}_{4} in an acidic medium? (i) Both {HCl} and {KMnO}_{4} act as oxidising agents.

Why is \text {HCl} not used to make the medium acidic in oxidation reactions of \text {KMnO}_{4} in an acidic medium?

(i) Both  \text {HCl} and \text {KMnO}_{4} act as oxidising agents.

(ii) \text {KMnO}_{4} oxidises \text {HCl} into \text {Cl}_{2} which is also an oxidising agent.

(iii) \text {KMnO}_{4} is a weaker oxidising agent than \text {HCl}.

(iv) \text {KMnO}_{4} acts as a reducing agent in the presence of \text {HCl}.

Answers (1)

The answer is the option (ii). \text {HCl} is oxidised by \text {KMnO}_{4} into \text {Cl}_{2}  which is also an oxidising agent. Since hydrochloric acid is oxidised to chlorine, permanganate titrations in their presence are unsatisfactory.

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