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InterviewSolution
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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 obtainedA. lyophilic solB. hydrophobic solC. lyophobic solD. hydrophilic sol |
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Answer» Correct Answer - C 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. |
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