Ncert Exercises & Solutions

Select the correct option based on statements below:

Assertion (A):	Colloidal solutions do not show Brownian motion.
Reason (R):	Brownian motion is responsible for the stability of sols.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Brownian movement is a property of the colloidal solution.

Explanation:

When colloidal solutions are viewed under a powerful ultramicroscope, the colloidal particles appear to be in a state of continuous zig-zag motion all over the field of view. This movement is known as the Brownian movement.

The Brownian movement has a stirring effect which does not permit the particles to settle and thus, is responsible for the stability of sols.

So, option 4 is the correct answer.

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