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In dilute alkaline solution $\mathrm{MnO}_4^{-}$changes to
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$\mathrm{MnO}_4^{-}$
In strong base,
$4 \mathrm{MnO}_4^{-}+4 \mathrm{OH}^{-} \longrightarrow 4 \mathrm{MnO}_4^{2-}+\mathrm{O}_2+2 \mathrm{H}_2 \mathrm{O}$
$4 \mathrm{MnO}_4^{-}+4 \mathrm{OH}^{-} \longrightarrow 4 \mathrm{MnO}_4^{2-}+\mathrm{O}_2+2 \mathrm{H}_2 \mathrm{O}$
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