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A sample of Fe2(SO4)3 and FeC2O4 was dis...

A sample of Fe2(SO4)3 and FeC2O4 was dissolved in dil `H_2SO_4`. The complete oxidation of reaction mixture req. 40 ml of N/16 `KMnO_4`. After the oxidation mixture was reduced by Zn and dil. `H_2SO_4`. On again oxidation by same `KMnO_4`, 60 ml were require. Calculate the ratio of millimoles of `Fe_2(SO_4)_3` and `FeC_2O_4` in mixture.

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The correct Answer is:
`7:6`
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