These are: (1) relative lowering of vapour
pressure of the solvent (2) depression of freezing point of the solvent
(3) elevation of boiling point of the solvent and (4) osmotic pressure of
the solution All these properties depend on the number of solute
particles irrespective of their nature relative to the total number
of particles present in the solution Such properties are called
colligative properties (colligative: from Latin: co means together, ligare
means to bind) In the following Sections we will discuss these
properties one by one