Define each of the following terms:
(i) Micelles (ii) Peptization (iii) Desorption
(i) Micelles: The substances, which when dissolved in a medium at low
concentrations behave as normal, strong electrolytes but at higher
concentration exhibit colloidal state properties due to the formation of aggregated
particles and such aggregated particles thus formed are called micelles.
(ii) Peptization: It is a process of converting a fresh precipitate into colloidal
particles by shaking it with the dispersion medium in the presence of a small
amount of a suitable electrolyte.
(iii) Desorption: The removal of adsorbed substance from the surface of a
solid or liquid by heating or by reducing pressure is called desorption.