Explain What is observe when (i) An electrolyte, NaCl is added to hyd

1.	Explain What is observe when (i) An electrolyte, NaCl is added to hydrate ferric oxide sol. (ii) Electric current is passed through a colloidal sol. (iii) When a beam of light is passed through a colloidal sol.
Answer» (i) The positively charged colloidal particles of Fe(OH)₃ get coagulated by the positively charged Cl- ions provided by NaCl. (ii) On passing direct current, colloidal particles move towards the positively charged electrode where they lose their charge and get coagulated. (iii) Scattering of light by the colloidal particles takes place and the path of light becomes visible (Tyndall effect).

Explain What is observe when (i) An electrolyte, NaCl is added to hydrate ferric oxide sol. (ii) Electric current is passed through a colloidal sol. (iii) When a beam of light is passed through a colloidal sol.

Answer»

(i) The positively charged colloidal particles of Fe(OH)₃ get coagulated by the positively charged Cl- ions provided by NaCl.

(ii) On passing direct current, colloidal particles move towards the positively charged electrode where they lose their charge and get coagulated.

(iii) Scattering of light by the colloidal particles takes place and the path of light becomes visible (Tyndall effect).