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In order to oxidise a mixture of one mole of each of FeC2O4,Fe2(C2O4)3,FeSO4andFe2(SO4)3 in acidic medium, the number of moles of KMnO4 required is :
JEE MAIN 2019
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Solution
Change in oxidation state for respective species:
Fe2+→Fe3++e−
C2O2−4→2CO2+2e−
MnO−4→Mn2++5e−
There will be no change in the oxidation state of Fe2(SO4)3 as Fe is already in the highest oxidation state.
Using equivalence concept:
neq(KMnO4)=neq[FeC2O4]+neq[Fe2(C2O4)3]+neq[FeSO4]
Let n be the number of moles of KMnO4 n×5=(1×3)+(1×6)+(1×1)5n=10