CBSE  /  Class 12  /  Chemistry  /  Solutions

  • 1. 
    Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1 gof Y in 20 g of liquid X. If molar mass of X is 200, what is the molar mass of Y?

  • 20
  • 50
  • 100
  • 200

  • 2. 
    Partial pressure of a solution component is directly proportional to its mole fraction. This is known as

  • Henry’s law
  • Raoult’s law
  • Distribution law
  • Ostawald’s dilution law

  • 3. 
    3 moles of P and 2 moles of Q are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are 80 and 60 torr respectively?

  • 80 torr
  • 140 torr
  • 72 torr
  • 70 torr

  • 4. 
    Which of the following solutions shows positive deviation from Raoult’s law?

  • Acetone + Aniline
  • Acetone + Ethanol
  • Water + Nitric acid
  • Chloroform + Benzene

  • 5. 
    The system that forms maximum boilingazetrope is

  • Acetone-chloroform
  • ethanol-acetone
  • n-hexane-n-heptane
  • carbon disulphide-acetone

  • 6. 
    A plant cell shrinks when it is kept in a

  • hypotonic solution
  • hypertonic solution
  • isotonic solution
  • pure water

  • 7. 
    The relative lowering in vapour pressure is proportional to the ratio of number of

  • solute molecules to solvent molecules
  • solvent molecules to solute molecules
  • solute molecules to the total number of molecules in solution
  • solvent molecules to the total number of molecules in solution

  • 8. 
    A solution containing 10.2 g glycerine per litre is isotonic with a 2% solution of glucose. What is the molecular mass of glycerine?

  • 91.8 g
  • 1198 g
  • 83.9 g
  • 890.3 g

  • 9. 
    What weight of glycerol should be added to 600 g of water in order to lower its freezing point by 10°C ?

  • 496 g
  • 297 g
  • 310 g
  • 426 g

  • 10. 
    The osmotic pressure of a solution can be increased by

  • increasing the volume
  • increasing the number of solute molecules
  • decreasing the temperature
  • removing semipermeable membrane
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