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What is the oxidation number of Mn is Mn...

What is the oxidation number of Mn is `MnO_(4)^(-)`?

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Mn in `MnO_4^(-)` , Let the oxidation number of Mn in `MnO_4^(-)` be x. Writing oxidation number of each atom above its symbol, we get,
`overset(x)(Mn)overset(-2)O_4i.e., x+4(-2)=-1i.e., x=+7`
Thus, the oxidation number of Mn in `MnO_4^(-)` is +7
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