Question

Consider 0.1 M solutions of two solutes X and Y. The solute X behaves as univalent electrolyte while the solute Y dimerises in solution. Which of the following statement(s) is/are correct regarding these solutions?

• A. The boiling point of the solution of X will be higher than that of Y.
• B. The osmotic pressure of the solution of Y will be hypotonic w.r.t. X.
• C. The freezing point of the solution of X will be higher than that of Y.
• D. The relative lowering of vapour pressure of both the solutions will be the same.

Answer 1

Answer: (A), (B)

The osmotic pressure of the solution of Y will be hypotonic w.r.t. X.

As X is an electrolyte, so van't Hoff factor for X will be > 1.
While Y dimerises in solution so van't Hoff factor will be <1.
Based on above two we can compare the options. So, option (a) and (b) are correct.