Question

Lyophilic sols are more stable than lyophobic sols because:
A.The colloidal particles have positive charge
B.The colloidal particles have no charge
C.The colloidal particles are more solvated
D.There are strong electrostatic repulsions between the negatively charged colloidal particles.

Answer 1

This question gives knowledge about the colloidal particles. The colloidal particles are defined as the particles with a diameter range $10{A^ \circ }$ to $2,000{A^ \circ }$ of the particles of a substance generally dispersed in the solvent.

Complete answer:
The lyophilic sols are more stable than lyophobic sols because lyophilic sols are solvent loving whereas lyophobic sols are solvent hating. Also in lyophobic sols, the dispersed phase shows no attraction for the solvent or the medium. And as we know, solvation is the most important property for the colloidal particles. Lyophobic sols are more stable because the colloidal particles are more solvated.

Therefore, option $C$ is the correct option.

Additional information:
The colloidal particles are defined as the particles with a diameter range $10{A^ \circ }$ to $2,000{A^ \circ }$ of the particles of a substance generally dispersed in the solvent. The colloidal dispersions or the colloidal solutions are the intermediate between suspensions and true solutions. The material which possesses particle size in the colloidal range is known as colloidal state. Colloidal particles consist of disc-like, rod-like, long filaments or thin films like shapes.
Sols are defined as an important class of colloidal system in which solid is generally dispersed in the liquid. Sols are of two types:
Types of sols are as follows:
$1$. Lyophilic sol
$2$. Lyophobic sol
Lyophilic sols are defined as the sols in which the dispersed phase shows a definite affinity for the solvent or the medium. Lyophilic sols are solvent loving.
Lyophobic sols are defined as the sols in which the dispersed phase shows no attraction for the solvent or the medium. Lyophobic souls are solvent hating.

Note:
Always remember that the colloidal dispersions or the colloidal solutions are the intermediate between suspensions and true solutions. Sols are defined as an important class of colloidal system in which solid is generally dispersed in the liquid.