1

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.2

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.

3

IIT-JEE 1992

Subjective

+5

-0

A 2.0 g sample of a mixture containing sodium carbonate, sodium bicarbonate and sodium suplphate is gently heated till the evolution of CO

_{2}ceases. The volume of CO_{2}at 750 mm Hg pressure and at 298K is measured to be 123.9 ml. A 1.5g of the same sample requires 150 ml. of (M/10) HCl for complete neutralisation. Calculate the % composition of the components of the mixture.4

IIT-JEE 1992

Subjective

+4

-0

One gram of commercial AgNO

(Reaction : KIO

_{3}is dissolved in 50 ml. of water. It is treated with 50 ml. of a KI solution. The silver iodide thus precipitated is filtered off. Excess of KI in the filterate is titrated with (M/10) KIO_{3}solution in presence of 6M HCl till all I^{-}ions are converted into ICl. It requires 50 ml. of (M/10) KIO_{3}solution. 20 ml. of the same stock solution of KI requires 30 ml. of (M/10) KIO_{3}under similar conditions. Calculate the percentage of AgNO_{3}in the sample.(Reaction : KIO

_{3}+ 2KI + 6HCl $$\to$$ 3ICl + 3KCl + 3H_{2}O)Questions Asked from Some Basic Concepts of Chemistry (Subjective)

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