What is the oxidation number of Mn in the product of the alkaline oxidative fusion of $M n O_{2}$ ?

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Solution

$M n O_{4}^{2 -}$ , these compounds are sometimes called manganates, and they are dark green. Mnaganates are formed by oxidizing $M n O_{2}$ in fused $K O H$ with air.

Hence, the oxidation number of $M n$ is $6$ .

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