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Question:

The correct option among the following is:
ABrownian motion in colloidal solution is faster the viscosity of the solution is very high
BColloidal particles in lyophobic sols can be precipitated by electrophoresis
CColloidal medicines are more effective because they have small surface area
DAddition of alum of water makes it unfit for drinking

Brownian motion in colloidal solution is faster the viscosity of the solution is very high

Colloidal particles in lyophobic sols can be precipiated by electrophoresis

Colloidal medicines are more effective because they have small surface area

Addition of alum of water makes it unfit for drinking

Solution:

Correct option is B. Colloidal particles in lyophobic sols can be precipitated by electrophoresis. The stability of the lyophobic sols is due to the presence of charge on colloidal particles. If somehow the charge is removed the particles will come nearer to each other and settle down under gravity. The existence of charge on colloidal particles is confirmed by the electrophoresis experiment. The movement of colloidal particles under an applied electric potential is called electrophoresis.