Question: Paragraph: A 3.0 g sample containing FezO4, Fe203 and an inert impure substance is treated with excess of KI solution in presence of dilute

Paragraph: A 3.0 g sample containing FezO4, Fe203 and an inert impure

Paragraph: A 3.0 g sample containing FezO4, Fe203 and an inert impure substance is treated with excess of KI solution in 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 11.0 mL of 0.5 M Na,S203 solution to reduce the iodine present. A 50 mL of the diluted solution, after complete extraction of iodine requires 12.80 mL of 0.25 M KMNO4 solution in dilute H2SO4 medium for the oxidation of Fe2+.

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