Relative lowering of vapor pressure is a colligative property because:

(a) It depends on the concentration of a non-electrolyte solute in a solution and does not depend on the nature of the solute molecules
(b) It depends on the number of particles of electrolyte solute in a solution and does not depend on the nature of the solute particles
(c) It depends on the concentration of a non-electrolyte solute in solution as well as on the nature of the solute molecules
(d) It depends on the concentration of an electrolyte or non-electrolyte solute in solution as well as on the nature of solute molecules


The correct choice among the given is:

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, d)

Hint: Depends upon the number of solute particles but does not depend upon the nature of the solute
Relative lowering of vapour pressure is a colligative property because
(i) It does not depend upon nature of solute.
(ii) It depends upon number of solute particles.
(ii) It depends upon concentration of non-electrolyte solution.
Hence, (a) and (b) are correct.