The number of moles of `KMnO_(4)` that will be needed to react with one mole of sulphite ion in acidic solution is
The number of moles of `KMnO_(4)` that will be needed to react with one mole of sulphite ion in acidic solution is
A. `2/5`
B. `3/5`
C. `4/5`
D. 1
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Correct Answer - A
In acidic medium , `MnO_4^(-)` oxidises `SO_3^(2-)` to `SO_4^(2-)`
`{:((MnO_4^(-) + 8H^(+) + 5e^(-) to Mn^(2+) + 4H_2O "]" xx2),(SO_3^(2-)+H_2O to SO_4^(2-) + 2H^(+) + 2e^(-) "]" xx5))/(2MnO_4^(-) + 5SO_3^(2-) + 6H^(+) to 2Mn^(2+) + 5SO_4^(2-) + 3H_3O) :}`
Hence, 2 moles of `MnO_4^(-) -=` 5 moles of `SO_3^(2-)` or `2/5` moles of `MnO_4^(-) -=` 1 mole of `SO_3^(2-)`
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