Question -
Answer -
(i) Electrophoresis (ii) Coagulation
(iii) Dialysis (iv) Tyndall effec
Answer
(i) Electrophoresis:
The movement of colloidalparticles under the influence of an applied electric field is known aselectrophoresis. Positively charged particles move to the cathode, whilenegatively charged particles move towards the anode. As the particles reachoppositely charged electrodes, they become neutral and get coagulated.
(ii) Coagulation:
The process of settling down ofcolloidal particles i.e., conversion of a colloid into a precipitate is calledcoagulation.
(iii) Dialysis
The process of removing adissolved substance from a colloidal solution by the means of diffusion througha membrane is known as dialysis. This process is based on the principle thations and small molecules can pass through animal membranes unlike colloidalparticles.
(iv) Tyndall effect:
When a beam of light is allowedto pass through a colloidal solution, it becomes visible like a column oflight. This is known as the Tyndall effect. This phenomenon takes place asparticles of colloidal dimensions scatter light in all directions.