What is the oxidation number of Manganese in Potassium Permanganate?

What is the oxidation number of Manganese in Potassium Permanganate?
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ANSWER: PLUS SEVEN
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Identify the result of chemical reaction between permanganate ion and Br- ?

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In the reaction of oxalate with permanganate in acidic medium, the number of electrons involved in producing one molecule of `CO_(2)` is

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