When a true solution is mixed with an excess of the other solvent in which the solute is insoluble but solvent is miscible, a ________ is obtained

Options

A. lyophilic sol
B. hydrophobic sol
C. lyophobic sol
D. hydrophilic sol

Answer

C

Explanation

This condensation method of preparation of lyophobic sol is called exchange of solvent (a physical method). For example, when a solution of sulphur in alcohol is poured in excess of water, a colloidal sol of sulphur is obtained.
Another physical condensation method is excessive cooling. For example, the colloidal sol of ice in an organic solvent such as `CHCl_(3)` or ether can be obtained by freezing a solution of water in the solvent. The molecules of water which can no longer be held in solution separately combine to form particles of colloidal size.