Quiz on Chapter -2 Solution Chapter Chemistry Class-12th 

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Quiz Questions Solutions :

1. Which of the following units is useful in relating concentration of solution with its vapour pressure?    *1 point

a. molality

b.  mass%

c. mole fraction

d.  ppm

Ans. Mole fraction 

2. On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid?    *1 point

a. Sugar crystal in cold water

b.  Powderd Sugar in hot water

c.  Powderd Sugar in cold water

d.  Sugar crystal in hot water

Ans. Powderd Sugar in hot water

3. At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is __________.    *1 point

a.  less than the rate of crystallisation

b. greater than the rate of crystallisation

c.  equal to the rate of crystallisation

d.  zero

Ans.  equal to the rate of crystallisation

4. Maximum amount of a solid solute that can be dissolved in a specified amount of a given liquid solvent does not depend upon ____________.   *1 point

a.  Temperature

b.  Nature of solute

c.  Pressure

d.  Nature of solvent

Ans.  Pressure

5. Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?   *1 point

a.  Methanol and acetone

b.  Chloroform and acetone.

c. Nitric acid and water.

d.  Phenol and aniline

Ans.  Methanol and acetone

6. Colligative properties depend on ____________.    *1 point

a. the nature of the solute particles dissolved in solution.

b.  the number of solute particles in solution.

c.  the physical properties of the solute particles dissolved in solution

d.  the nature of solvent particles.

Ans.  the nature of the solute particles dissolved in solution.

7. Value of Henry’s constant Kh ____________.       *1 point

a.  increases with increase in temperature.

b. decreases with increase in temperature.

c. remains constant.

d. first increases then decreases.

Ans. increases with increase in temperature.

8. On the basis of information given below mark the correct option. Information:(A) In bromoethane and chloroethane mixture inter molecular interactions of A–A and B–B type are nearly same as A–B type interactions.(B) In ethanol and acetone mixture A–A or B–B type inter molecular interactions are stronger than A–B type interactions.(C) In chloroform and acetone mixture A–A or B–B type inter molecular interactions are weaker than A–B type interactions.              *1 point

a. Solution (B) and (C) will follow Raoult’s law. increases with increase in temperature.

b. Solution (A) will follow Raoult’s law.

c. Solution (B) will show negative deviation from Raoult’s law.

d. Solution (C) will show positive deviation from Raoult’s law.

Ans.  Solution (A) will follow Raoult’s law.

9. Low concentration of oxygen in the blood and tissues of people living at high altitude is due to          *1 point

a.  low temperature

b.  low atmospheric pressure

c.  high atmospheric pressure

d. both low temperature and high atmospheric pressure

Ans low atmospheric pressure

 

10. The values of Van’t Hoff factors for KCl, NaCl and K2 SO4 , at 100 % dissociation respectively, are_________.       *1 point

a.  2, 2 and 2

b.  2, 2 and 3

c.  1, 1 and 2

d.   1, 1 and 1

Ans. 2, 2 and 3