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Which of the following statements is INCORRECT?

1. MnO4²- is strongly oxidising and stable only in very strong alkali; in dilute alkaline or neutral solution it disproportionates.
2. In acidic medium MnO4⁻ is reduced to Mn²+, which is why KMnO4 is a widely used oxidising agent.
3. KMnO4 does not act as an oxidising agent in alkaline medium.
4. KMnO4 is made by fusing pyrolusite with KOH in the presence of air or KNO3, followed by electrolytic oxidation in strongly alkaline solution.

Correct answer: KMnO4 does not act as an oxidising agent in alkaline medium.

Solution

KMnO4 is an oxidising agent in alkaline (and neutral) medium too, where it is reduced to MnO2; so saying it does not oxidise in alkaline medium is wrong.

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