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Standard XII
Chemistry
Osmotic Pressure
Which one of ...
Question

Which one of the following statements is FALSE:


A
The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl2>KCL>CH3COOH sucrose.
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B
The osmotic pressure (π) of a solution is given by the equation π=MRT where M is the molarity of the solution.
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C
Raoult's law states that the vapour pressure of a component over a solution is proportional to its mole fraction
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D
Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.
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Solution

The correct option is D Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression.

The extent of depression in freezing point varies with the number of solute particles for a fixed solvent only and it is a characteristics feature of the nature of solvent also. So for two different solvents the extent of depression may vary even if number of solute particles be dissolved.


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Question 14
Which of the following statements is false?
(a) Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point.
(b) The osmotic pressure of a solution is given by the equation π=CRT (where, C is the molarity of the solution)
(c) Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is
BaCl2 > KCl > CH3COOH > sucrose
(d) According to Raoult's law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution

Q. An aqueous solution was found to have an osmotic pressure of 2.51 atm at 25oC. The freezing point of solution if Kf for water is 1.86Kmol−1kg will be:
Assume molarity and molality are same.

Q. If the osmotic pressure of a 0.010 M aqueous solution of sucrose at 27oC is 0.26 atm, then the osmotic pressure of a 0.010 M aqueous solution of NaCl at 27oC is:
Q. A solution of sucrose (Molar mass =342 g/mol) is prepared by dissolving 68.4 g of it per litre of solution, what is osmotic pressure (R=0.082 L atom K−1mol−1) at 273 K?
Q. 1 g mixture of glucose and urea present in 250 mL aqueous solution shows the osmotic pressure of 0.74 atm at 27oC. Assuming solution to be diluted, which are correct?

1. Percentage of urea in the mixture is 17.6.
2. Relative lowering of the vapour pressure of this solution is 5.41×10−4.
3. The solution will boil at 100.015oC, if Kb of water is 0.5 K molality−1.
4. If glucose is replaced by the same amount of sucrose, the solution will show higher osmotic pressure at 27oC.
5. If glucose is replaced by the same amount of NaCl, the solution will show lower osmotic pressure at 27oC.

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