1) Molarity of a solution is expressed as:

a) the number of moles of a solute present in one litre of the solution.
b) the number of moles of a solute present in 1000 gm of the solvent.
c) the number of gram equivalent of solute present in one litre of solution.
d) the ratio of the number of moles of solute to the total number of moles of solute.

ANSWER : the number of moles of a solute present in one litre of the solution.

2) Which one of the following is not a colligative property?

a) Osmotic pressure.
b) Elevation of boiling point.
c) Freezing point.
d) Depression in freezing point.

ANSWER : Freezing point.

3) Which of the following is not a volatile substance?

a) Camphor
b) Petrol
c) Acetone
d) Acetanilide

ANSWER : Acetanilide

4) Which of the following characteristics is not possessed by an ideal solution:

a) obeys Raoult’s law.
b) volume change on mixing is not equal to zero.
c) there should be no chemical reaction between solute and solvent.
d) only very dilute solutions behave as ideal solutions.

ANSWER : volume change on mixing is not equal to zero.

5) The phenomenon of lowering of vapour pressure is defined as:

a) decrease in vapour pressure of a solvent on addition of a volatile non electrolyte solute in it.
b) decrease in vapour pressure of a solvent on addition of a non-volatile non electrolyte solute in it.
c) decrease in vapour pressure of a solvent on addition of a volatile electrolyte solute in it.
d) decrease in vapour pressure of a solvent on addition of a non-volatile solute in it.

ANSWER : decrease in vapour pressure of a solvent on addition of a non-volatile non electrolyte solute in it.

6) The value of Ebullioscopic constant or boiling point elevation constant depends on:

a) amount of solute.
b) nature of solute.
c) amount of solvent.
d) nature of solvent.

ANSWER : nature of solvent.

7) Which of the following is not applicable for Landsberger – Walker method used for determination of molecular weight from boiling point elevation?

a) The solution should be dilute.
b) Air should be passed at low pressure.
c) It is applicable only for non-volatile solutes.
d) The solute should not undergo association or dissociation.

ANSWER : Air should be passed at low pressure.

8) The unit of Cryoscopic constant is:

a) kelvin kg mol^-1
b) kelvin kg^-1 mol^-1
c) kelvin kg mol⁺¹
d) kelvin kg⁺¹ mol⁺¹

ANSWER : kelvin kg mol^-1

9) Vant Hoff’s eqution for solution is:

a) pV = n / RT.
b) p = Vn / RT.
c) pV = nRT.
d) p = VnR / T.

ANSWER : pV = nRT.

10) when osmotic pressure and temperature are the same then:

a) equal volume of solutions would contain equal number of moles of the solute.
b) equal volume of solutions would contain non-equal number of moles of the solute.
c) non-equal volume of solutions would contain equal number of moles of the solute.
d) non-equal volume of solutions would contain non-equal number of moles of the solute.

ANSWER : equal volume of solutions would contain equal number of moles of the solute. 

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