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In alkaline medium, the reaction of hydrogen peroxide with potassium permanganate produces a compound in which the oxidation state of $\mathrm{Mn}$ is
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+4
$$
2 \mathrm{MnO}_{4}^{-}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{MnO}_{2}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+3 \mathrm{O}_{2}(\mathrm{~g})+2 \mathrm{OH}^{-}{ }_{(\mathrm{aq})}
$$
Oxidation state of $\mathrm{Mn}$ in $\mathrm{MnO}_{2}$ is $+4$.
2 \mathrm{MnO}_{4}^{-}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{MnO}_{2}(\mathrm{~s})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+3 \mathrm{O}_{2}(\mathrm{~g})+2 \mathrm{OH}^{-}{ }_{(\mathrm{aq})}
$$
Oxidation state of $\mathrm{Mn}$ in $\mathrm{MnO}_{2}$ is $+4$.
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