(i) the nature of the solute particles dissolved in solution.

(ii) the number of solute particles in solution.

(iii) the physical properties of the solute particles dissolved in solution.

(iv) the nature of solvent particles.

Correct Answer: (ii) the number of solute particles in solution

Explanation: The colligative property of a solution depends on the number of particles present in a given solution or mole fraction of solute.