Explanation
Colligative properties are properties of solutions that are assumed to depend on the ratio of the number of solute particles to the number of solvent molecules in a solution and not on the type of chemical species present. Hence Boiling point elivation , freezing point depression and lowering of vapour pressure are colligative properties . Whereas pH of a buffer solution is not a colligative property because pH depends only upon the molar concentration of H+ ion not on their number of particles in it.
NaCl is an electrolyte which dissociates to give ions. Concentration of ions in the solution is equal to 4M. Glucose and urea are non-electrolytes. As glucose has maximum concentration, so it has minimum osmotic pressure.
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