Explain the following terms (i) Electrophoresis, (ii) Coagulation (iii) Dialysis (iv) Tyndall effect.

(i) Electrophoresis: The movement of colloidal particles under an applied electric potential is called Electrophoresis. When an electric potential is applied to two platinum electrodes dipping in colloidal solutions the colloidal particle move towards the Oppositely charged electrodes.

(ii) Coagulation: The process of settling of colloidal particles is called coagulation. When the charge is removed from colloidal solution somehow, then particle start coagulation and settling due to the force of gravity.

(iii) Dialysis: It is a process of removing a dissolved substance from ac colloidal solution by means of diffusion through a suitable membrane. the animal membrane or parchment paper used as a membrane.

(iv) Tyndall Effect: When homogenous solution is placed in a dark and viewed in light beam then if it is viewed from sides it appears visible but if it is viewed from 90° it appears to be dark. This effect is known as Tyndall effect.