1

IIT-JEE 2004

Subjective

+2

-0

1.22 g of benzoic acid is dissolved in 100 g of acetone and 100 g of benzene separately. Boiling point of the solution in acetone increases by 0.17

^{o}C, while that in the benzene increases by 0.13^{o}C; K_{b}for acetone and benzene is 1.7 K kg mol^{-1}and 2.6 K kg mol^{-1}. Find molecular weight of the benzoic acid in two cases and justify your answer.2

IIT-JEE 2000

Subjective

+3

-0

To 500 cm

^{3}of water, 3.0 $$\times$$ 10^{-3}kg of acetic acid is added. If 23% of acetic acid is dissociated, what will be the depression in freezing point? Kf and density of water are 1.86 K kg^{-1}mol^{-1}and 0.997 g cm^{-3}, respectively3

IIT-JEE 1999

Subjective

+10

-0

Nitrobenzene is formed as the major product along with a minor product in the reaction of benzene with a hot mixture of nitric acid and sulphuric acid. The minor product consists of carbon : 42.86 %, hydrogen : 2.40%, nitrogen : 16.67% and oxygen : 38.07% (i) Calculate the empirical formula of the minor product. (ii) When 5.5 g of the minor product is dissolved in 45 g of benzene, the boiling point of the solution is 1.84

^{o}C higher than that of pure benzene. Calculate the molar mass of the minor product and determine its molecular and structural formula. (Molal boiling point elevation constant of benzene is 2.53 K kg mol^{-1})4

IIT-JEE 1998

Subjective

+4

-0

A solution of a nonvolatile solute in water freezes at -0.30

^{o}C. The vapour pressure of pure water at 298 K s 23.51 mm Hg and K_{f}for water is 1.86 K kg mol^{-1}. Calculate the vapour pressure of this solution at 298 K.Questions Asked from Solutions (Subjective)

Number in Brackets after Paper Indicates No. of Questions

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