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The oxidation number of $\mathrm{Mn}$ in the product of alkaline oxidative fusion of $\mathrm{MnO}_2$ is
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$2 \mathrm{MnO}_2+4 \mathrm{KOH}+\mathrm{O}_2 \stackrel{\text { Fusion }}{\longrightarrow} 2 \mathrm{~K}_2 \mathrm{MnO}_4+2 \mathrm{H}_2 \mathrm{O}$
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