Question

The correct option among the following is

• A. Colloidal particles in lyophobic sols can be precipitated by electrophoresis
• B. Brownian motion in colloidal solution is faster if the viscosity of the solution is very high.
• C. Colloidal medicines are more effective because they have small surface area
• D. Addition of alum to water makes it unfit for drinking.

Answer 1

Answer: (A)

$1.$ Lyophilic colloids may migrate in either direction (or) may not migrate at all where as lyophobic particles migrate in only one direction in electric field.
$2.$ Brownian movement is faster if viscosity of medium is low.
$3.$ Colloidal medicines are more effective due to more surface area.
$4.$ Addition of alum removes impurities from water due to coagulation.