The correct option among the following is

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Colloidal particles in lyophobic sols can be precipitated by electrophoresis

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

Colloidal medicines are more effective because they have small surface area

Addition of alum of water makes it unfit for drinking

answer is A.

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Detailed Solution

● 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 charged particles in a fluid or gel under the influence of an electric field is known as electrophoresis.

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