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Question

A given amount of Fe2+ is oxidised by x moles of MnO4 in acidic medium. Calculate number of moles of Cr2O27 required to oxidise same amount in Fe2+ in acidic medium if x=5.

A
6
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B
5.4
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C
7
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D
None of these
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Solution

The correct option is A 6
The balanced reactions are as follows:
6Fe2++Cr2O27H+2Cr3++H2O+6Fe3+
5Fe2++MnO4H+Mn2++H2O+5Fe3+
MoleofMnO4MoleofCr2O27=56(ratioofFe2+oxidised)
MoleofCr2O27=1.2x

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