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. Select correct statement (s) regarding these solutions
Answers
Complete 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. Select correct statement (s) regarding these solutions:
1) The boiling point of solution of X will be higher than that of Y.
2) The osmotic pressure of solution of Y will be lower than of X.
3) The freezing point of the solution of X will be lower than that of Y.
4) The relative lowering of vapour pressure of both the solutions will be th same.
Solution:
The correct statements regarding these solutions are:
(1), (2) and (3)
- It is given that X is univalent electrolyte.
⇒ Its Vant Hoff factor, i = 2
- It is given that Y dimerises in solution.
⇒ Its Vant Hoff factor, i = 1/2
- The elevation in B.P, osmotic pressure, depression in freezing point and relative lowering of vapour pressure are colligative properties.
- Since the concentration of both X and Y are the same, these properties will
depend upon the Vant Hoff factor.
- As i is greater for X, it will have a higher boiling point.
- As i is lower for Y, it will have lower osmotic pressure.
- As i is greater for X, it will have a lower freezing point.
- As i is not same for X and Y, the relative lowering of vapour pressure will not be the same.
- Hence, only option (1), (2) and (3) will be correct.