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The number of moles of KMnO(4) needed to...

The number of moles of `KMnO_(4)` needed to react with one mole of `SO_(3)^(2-)` in acidic solution is

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The correct Answer is:
3
`2MnO_(4)^(-) + 5SO_(3)^(2-) + 6H^(+) to 2Mn^(2+) + 5SO_(4)^(2-) + 3H_(2)O`
or `3MnO_(4)^(-) + 7.5SO_(2-)^(4)` + 4`.5H_(2)O`
So no. of moles of `MnO_(4)^(-)` required to react with 7 moles of `SO_(3)^(-2)` completely in the acid medium is 3.
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