1

IIT-JEE 1996

Subjective

+3

-0

The molar volume of liquid benzene (density = 0.877 g mL

^{-1}) increases by a factor of 2750 as it vaporises at 20^{o}C and that of liquid toluene (density = 0.867 g mL^{-1}) increases by a factor of 7720 at 20^{o}C. A solution of benzene and toluene at 20^{o}C has vapour pressure of 46.0 Torr. Find the mole fraction of benzene in the vapour above the solution.2

IIT-JEE 1993

Subjective

+3

-0

What weight of the non-volatile solute, urea(NH

_{2}- CO - NH_{2}) needs to be dissolved in 100g of water, in order to decrease the vapour pressure of water by 25%? What will be the molality of the solution?3

IIT-JEE 1991

Subjective

+4

-0

The degree of dissociation of calcium nitrate in a dilute aqueous solution, containing 7.0 g. of the salt per 100 gm of water at 100

^{o}C is 70%. If the vapour pressure of water at 100^{o}C is 760 mm, calculate the vapour pressure of the solution.4

IIT-JEE 1990

Subjective

+3

-0

The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. A non-volatile non-electrolyte solid weighing 2.175 g is added to 39.0 g of benzene. The vapour pressure of the solution is 600 mm Hg. What is the molecular weight of the solid substance?

Questions Asked from Solutions (Subjective)

Number in Brackets after Paper Indicates No. of Questions

JEE Advanced Subjects

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Units & Measurements Motion Laws of Motion Work Power & Energy Impulse & Momentum Rotational Motion Properties of Matter Heat and Thermodynamics Simple Harmonic Motion Waves Gravitation

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Physical Chemistry

Some Basic Concepts of Chemistry Structure of Atom Redox Reactions Gaseous State Chemical Equilibrium Ionic Equilibrium Solutions Thermodynamics Chemical Kinetics and Nuclear Chemistry Electrochemistry Solid State Surface Chemistry

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