Colligative properties of a solution depend upon the number of moles of a solute dissolved and do not depend upon the nature of the solute. However, they are applicable only to dilute solutions in which the solutes do not undergo any association or dissociation. For solutes undergoing such changes, van't Hoff introduced a factor, called van't Hoff factor (i). This has helped not only to explain the abnormal molecular masses of such solutes in the solution but has also helped to calculate the degree of association or dissociation. Which one of the following aqueous solutions will have the lowest freezing point ?

Colligative properties of a solution depend upon the number of moles o

1.	Colligative properties of a solution depend upon the number of moles of a solute dissolved and do not depend upon the nature of the solute. However, they are applicable only to dilute solutions in which the solutes do not undergo any association or dissociation. For solutes undergoing such changes, van't Hoff introduced a factor, called van't Hoff factor (i). This has helped not only to explain the abnormal molecular masses of such solutes in the solution but has also helped to calculate the degree of association or dissociation. Which one of the following aqueous solutions will have the lowest freezing point ?
Answer» 0.1 molal solution of urea 0.1 molal solution of acetic acid 0.1 molal solution of SODIUM chloride 0.1 molal solution of calcium chloride Solution :`CaCl_(2)` GIVES MAXIMUM particles on dissociation. Hence, `DeltaT_(f)` is maximum, i.e., `T_(f)` is lowest.