1

IIT-JEE 1996

Subjective

+5

-0

A 3.00 g sample containing Fe

_{3}O_{4}, Fe_{2}O_{3}and an inert impure substance is treated with excess of KI solution in presence of dilute H_{2}SO_{4}. The entire iron is converted into Fe^{2+}along with the liberation of iodine. The resulting solution is diluted to 100 ml, A 20 ml of the diluted solution requires 11.0 ml of 0.5 M Na_{2}S_{2}O_{3}solution to reduce the iodine present. A 50 ml of the diluted solution, after complete extraction of the iodine requires 12.80 ml of 0.25 M KMnO_{4}solution in the dilute H_{2}SO_{4}medium for the oxidation of Fe^{2+}. Calculate the percentages of Fe_{2}O_{3}and Fe_{3}O_{4}in the original sample.2

IIT-JEE 1994

Subjective

+2

-0

The composition of a sample of Wustite is Fe

_{0.93}O_{1.00}what percentage of the iron is present in the form of Fe(III)?3

IIT-JEE 1994

Subjective

+3

-0

8.0575 $$\times$$ 10

^{-2}kg of Glauber's salt is dissolved in water to obtain 1 dm^{3}of a solution of density 1077.2 kg.m^{-3}. Calculate the molarity, molality and mole fraction Na_{2}SO_{4}in the solution.4

IIT-JEE 1993

Subjective

+3

-0

Upon mixing 45.0 ml. of 0.25 M lead nitrate solution with 25.0 ml. of 0.10M chromic sulphate solution, precipitation of lead sulphate takes place. How many moles of lead sulphate are formed? Also, calculate the molar concentrations of the species left behind in the final solution. Assume that lead sulphate is completely insoluble.

Questions Asked from Some Basic Concepts of Chemistry (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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