Question

Example of associated colloid is:
A. Milk
B. Soap solution
C. Rubber latex
D. Vegetable oil

Answer 1

Hint : Associated colloids are those substances which while dissolving behave as normal strong electrolyte at low concentration but exhibit colloidal properties at higher concentration. There is a formation of aggregated particles and hence resembles colloidal properties.

Complete Step By Step Answer:
Colloids are a homogeneous non crystalline substance which is a larger molecule and is dispersed into a second substance. Colloids include emulsion, gels and sols. Like in suspension, these particles cannot settle and cannot be separated by filtering. In colloids, the particle ranges from 1 to 1000nm in diameter.
The solution of colloid is termed as colloid dispersion because of the fact that the particles of these solutions never settle down or mix well. They are classified on the bases on following criteria that is the physical state of dispersion medium and phase. Also, on basis of nature of interaction between the dispersed phase and dispersion medium
The associated colloids are usually formed by surfactants. The molecules of soap and detergents are smaller than the colloidal particles. When dissolved in water these molecules act as electrolyte but if their concentration is increased then their molecules aggregate to form colloidal size particles called micelles. The example is Micelle’s formation in detergents as well as in soaps.

Note :
The drug is used for solubilization using micelles forming amphiphiles, which results in increasing the water solubility and hence improving bioavailability. It reduces the adverse effects such as caused by drugs.