What is the oxidation number of manganese in ${M n O_{4}}^{-}, M n_{2} O_{3}, a n d M n O_{2}$ ?

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Solution

The oxidation number of $M n$ in each of the compounds respectively are:

${M n O_{4}}^{-} = x - 8 = - 1 \Rightarrow 7$
$M n_{2} O_{3} = 2 x - 6 = 0 \Rightarrow 3$
$M n O_{2} = x - 4 = 0 \Rightarrow 4$

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