North Maharashtra University 2009 B.Sc Chemistry Colligative properties. - Question Paper

the relation ranging from depression of freezing point and concentration of
solute.
10. What is cryoscopic constant? How it is use to determine latent heat of
fusion.
11. Derive the relation ranging from freezing point depression and molecular
weight of solute.
12. How osmotic pressure is used to determine molecular weight?
13. When 18 gm of glucose dissolved in 100 gm of pure distilled water the
boiling point raises by 0.52 K. compute the molal elevation constant for
water.(Molecular weight of glucose is 180).
14. compute the Osmotic pressure of 0.01 M cane sugar solution at 300 K.
R=0.0821 L.atm deg-1mol-1
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15. A 0.5 molal solution of a non-volatile solute in nitrobenzene causes a
lowering of freezing point of nitrobenzene by five degrees. compute the
molal depression point constant of nitrobenzene?
16. If 0.1 molal aqueous solution of a substance is boiled at 373.025 K then
compute the molal elevation constant of water.
17. On addition of can sugar to water the freezing point of water depressed by
0.365 K. What is the molality of sugar solution.( Kf=1.825 Km-1)
18. What is the elevation in boiling point of 1 molal solution of glucose?
(Kb=0.52 K.Kgmole-1)
19. At 300 K the solution of urea has it molality 0.1.Calculate the osmotic
pressure of urea solution (R=0.082 L.atm.K-1mole-1)

ques. of 4 marks.

1. discuss qualitatively why boiling point is elevated while in freezing point is
depressed by dissolving non-volatile solute in solvent.
2. State Raoult’s legal regulations. Show that relative lowering of vapour pressure is a
Colligative property.
3. discuss the term molal elevation constant. How molecular weight of a
substance in solution is determined by method of elevation of boiling point.
4. discuss the term Colligative properties. explain in brief the dependence of
elevation of boiling point on the concentration.
5. define the Landberger’s method for determination of molecular weight
of non-volatile solute.
6. define the Beckmann’s method for determination of molecular weight of
non-volatile solute.
7. define Berkely and Hartley’s method for the determination of osmotic
pressure.
8. Write a note on Van’t-Hoff factor.
9. Write Van’t-Hoff formula for osmotic pressure of dilute solution. discuss
the term involved in it. How it can be used to compute the molecular

Earning:   Approval pending.