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MnO(4)^(-) is reduced to Mn^(2+) in acid...

`MnO_(4)^(-)` is reduced to `Mn^(2+)` in acidic medium and to `MnO_(2)` in neutral medium when `MnO_(4)^(-)` acts as oxidant 20 ml of a solution of `Fe^(2+)` required 30 ml `MnO_(4)^(-)` solution in acidic medium. What volume of this aq `MnO_(4)^(-)` is needed for the same `Fe^(2+)` solution if 30 ml is used in neutral medium

A

40ml

B

20ml

C

75ml

D

60ml

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