Question

Match the items of Column I and Column II.

Column I	Column II
(i) Dialysis	(a) Cleansing action of soap
(ii) Peptisation	(b) Coagulation
(iii) Emulsification	(c) Colloidal sol formation
(iv) Electrophoresis	(d) Purification

Answer 1

Column I	Column II
(i) Dialysis	(d) Purification
(ii) Peptisation	(c) Colloidal sol formation
(iii) Emulsification	(a) Cleansing action of soap
(iv) Electrophoresis	(b) Coagulation

Explanation:

(i) Purification of colloid can be done by dialysis in which ions/particles are removed from solution through semipermeable membrane.

(ii) Peptisation is a process in which when small quantity of electrolyte (peptizing agent) is added to precipitate. It leads to formation of colloidal solution.

(iii) The process of removing of oily or greasy dirt from the cloth is done by emulsification.

(iv) Process of setting of colloidal particle is called coagulation. Electrophoresis is a process in which on applying electric potential to the electrodes dipped in sol, the oppositely charged particles of colloidal solution move towards oppositely charged electrodes, get discharged and precipitated.