Ncert Exercises & Solutions

The correct statements among the following are :

a.	Mixing two oppositely charged sols neutralizes their charges and stabilizes the colloid.
b.	The presence of equal and similar charges on colloidal particles provides stability to the colloids.
c.	Any amount of dispersed liquid can be added to the emulsion without destabilizing it.
d.	Brownian movement stabilizes sols.

1. (a, b)

2. (b, c)

3. (c, d)

4. (b, d)

Hint: Any amount of dispersion medium can be added to emulsion without destabilising it.

The presence of equal and similar charges on colloidal particles provides stability to colloids repulsive forces between charged particles having the same charge prevent them from colliding when they come closer to each other.

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

Any amount of dispersed liquid can be added to emulsion without destabilising it. It is a wrong statement. The dilution of emulsions can be done by adding any amount of the dispersion medium. But any amount of dispersed liquid destabilising emulsions.

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