A 3.0 g sample containing Fe3O4,Fe2O3 and an insert impure substance is treated with excess of KI solution in the presence of dilute H2SO4. The entire iron is converted to Fe2+ along with the liberation of iodine.The resulting solution is diluted to 100 ml.A 20 ml of dilute solution requires 11.2 ml of 0.5M−Na2S2O3 solution to reduce the iodine present.A 50 ml of the diluted solution, after complete extraction of iodine,requires 12.80 ml of 0.25M−KMnO4 solution in dilute H2SO4 medium for the oxidation of Fe2+. The percentage of Fe2O3 in the original sample is

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A 3.0 g sample containing Fe3​O4​,Fe2​O3​ and an insert impure substance is treated with excess of KI solution in the presence of dilute H2​SO4​. The entire iron is converted to Fe2+ along with the liberation of iodine.The resulting solution is diluted to 100 ml.A 20 ml of dilute solution requires 11.2 ml of 0.5M−Na2​S2​O3​ solution to reduce the iodine present.A 50 ml of the diluted solution, after complete extraction of iodine,requires 12.80 ml of 0.25M−KMnO4​ solution in dilute H2​SO4​ medium for the oxidation of Fe2+. The percentage of Fe2​O3​ in the original sample is

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