Multiple choice

There is a little affinity between the dispersed phase & the dispersion medium of:

  1. lyophilic colloids

  2. macromolecular colloids

  3. multimolecular colloids

  4. lyophobic colloids
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D Correct answer
Explanation

In this type of colloidal sols, the dispersed phase has little affinity for the dispersion medium. These colloids are easily precipitated on the addition of small amounts of electrolytes, by heating or by shaking and therefore are not stable. Once precipitated, it is not easy to reconstitute the sol by simple mixing with the dispersion medium. Hence, these sols are called irreversible sols. Examples of lyophobic sols include sols of metals and their insoluble compounds like sulphides and oxides. Lyophobic sols need stabilizing agents to keep the dispersed phase from precipitating out.

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