What are colligative properties? Explain.

(N/A) Colligative properties are those properties of solutions that depend only on the number of solute particles present in the solution,regardless of their chemical nature.
These properties include:
$(i)$ Relative lowering of vapour pressure of the solvent
$(ii)$ Depression of freezing point of the solvent
$(iii)$ Elevation of boiling point of the solvent
$(iv)$ Osmotic pressure of the solution.