Describe what is observed when
(i) an electric current is passed through a colloidal solution.
(ii) a beam of light is passed through a colloidal solution.
(iii) an electrolyte such as NaCl, is added to hydrated ferric oxide sol.
(i) Electrophoresis takes place in which colloidal particles move towards the oppositely charged electrode where they lose their charge and get coagulated. (ii) The path of light becomes visible due to scattering of light by colloidal particles (Tyndall effect). (iii) The positively charged colloidal particles of Fe(OH)3 get coagulated by the negatively charged ions provided by electrolyte.
