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How many moles of KMnO4 are needed to o...

How many moles of `KMnO_4` are needed to oxidise a mixture of 1 mole each of `FeSO_4,FeC_2O_4` and `Fe_2(C_2O_4)_3` completely in acid medium :

A

5

B

2

C

4

D

6

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