Find the oxidation number of Mn in $M n O_{4}^{-}$ .

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Solution

Let X be the oxidation number of Mn in $M n O_{4}^{-}$ ..
The O atoms have oxidation number of -2.
$X + 4 (- 2) = - 1$
$X - 8 = - 1$
$X = + 7$
The oxidation number of Mn in $M n O_{4}^{-}$ . is $+ 7$ .

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