CBSE Class 12 Chemistry Solutions Quiz 2

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?

A 20 B 50 C 100 D 200

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

A Henry’s law B Raoult’s law C Distribution law D 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?

A 80 torr B 140 torr C 72 torr D 70 torr

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

A Acetone + Aniline B Acetone + Ethanol C Water + Nitric acid D Chloroform + Benzene

5. The system that forms maximum boilingazetrope is

A Acetone-chloroform B ethanol-acetone C n-hexane-n-heptane D carbon disulphide-acetone

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

A hypotonic solution B hypertonic solution C isotonic solution D pure water

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

A solute molecules to solvent molecules B solvent molecules to solute molecules C solute molecules to the total number of molecules in solution D 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?

A 91.8 g B 1198 g C 83.9 g D 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 ?

A 496 g B 297 g C 310 g D 426 g

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

A increasing the volume B increasing the number of solute molecules C decreasing the temperature D removing semipermeable membrane