Question

The stability of a Lyophobic colloid is due to:
(A) adsorption of covalent molecules on the colloid
(B) the size of the particles
(C) the charge on the particles
(D) tyndall effect

Answer 1

Hint: Here, the name Lyophobic colloid molecules are the ones who hate liquids (lyo means solvent and phobic means hating). These colloids mixed with suitable liquid form very weak forces of attraction.

Complete answer:
Let us have a basic idea about the Lyophobic colloid.
Lyophobic colloids-
- These are the liquid hating colloids and thus, they are very difficult to prepare. The lyophobic solutions are irreversible in nature as they are very less stable and addition of any amount of electrolyte can result in precipitation which cannot generate the original state of the same. Metal sulphide solutions are the examples of lyophobic solutions.
- The stability of lyophobic colloids is due to the charge on the particles it has. The charge exists due to the forces of attraction it has while the colloid is formed.

So, the correct answer is “Option C”.

Additional information:
Lyophilic colloids: These are exactly opposite to the properties of lyophobic colloids i.e. they are liquid loving colloids and are stable. The stability of lyophilic colloids is also due to the presence of the charges on the particles.

Note: Do note that the colloids have a tyndall effect present within them but, here this effect is not responsible for the stability of lyophobic and lyophilic colloids.
- Also, water hating colloids are called hydrophobic colloids and the colloidal dispersion formed is known as hydrophobic solution.