Dear Student,
Yes, colligative properties are possible in dilute solutions only where solute in non volatile and solvent is volatile. A dilute solution is one where the amount of solute is very less in comparison to the amount of solvent.Therefore, the dilute solutions show more or less ideal behaviour. Such solutions obeys Raoult's law. Colligative properties are the properties that depend upon only the number of particle of solute present in the solution. Therefore, the solute in the solution should be non volatile so that it cannot contribute to the vapour.