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Permanganate ion oxidises manganous ion ...

Permanganate ion oxidises manganous ion to manganese dioxide in presence of zinc oxide as catatalyst as ` MnO_(4)^(-) + Mn^(2+) + H_(2)O rarr MnO_(2) + H^(+)`. The number of `H^+` ion added to the product side in the balanced ionic equation is

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`2MnO_(4)^(-) + 3Mn^(+2) + 2H_2O rarr 2MnO_2 + 3MnO_4 + 4H^(+)`
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