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The correct option among the following is :

1. Addition of alum to water makes it unfit for drinking.
2. Colloidal medicines are more effective because they have small surface area.
3. Colloidal paraticles in lyophobic sols can be precipitated by electrophoresis.
4. Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.

Correct answer: Colloidal paraticles in lyophobic sols can be precipitated by electrophoresis.

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