The correct option among the following is :
Show Hint
- Addition of alum to water makes it unfit for drinking.
- Colloidal medicines are more effective because they have small surface area.
- Colloidal paraticles in lyophobic sols can be precipitated by electrophoresis.
- Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.
The Correct Option is C
Solution and Explanation
(2) Colloidal medicines are effective because the particles have a LARGE surface area, not a small one: false.
(3) In electrophoresis the charged particles of a lyophobic sol migrate to the oppositely charged electrode, lose their charge and get precipitated (coagulated): true (the usual accepted statement).
(4) Brownian motion is slower in a more viscous medium: false.
Answer: (3) Colloidal particles in lyophobic sols can be precipitated by electrophoresis.
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