Question

The difference between a lyophilic and lyophobic colloid is their:
A) Behavior towards dispersion medium
B) filterability
C) scattering of light
D) particle size

Answer 1

Hint: We know that there are generally two types of solvent: water-loving or lyophilic solvents, and the other is water-hating or lyophobic solvents. When they are dispersed in a water medium, they are commonly termed as hydrophobic and hydrophilic.

Complete answer:
Let us discuss them in detail.

Lyophilic colloid	Lyophobic colloid
a). The lyophilic solvent is usually water loving.	a). The lyophobic solvent is usually water hating species.
b). They have a greater affinity for the medium's dispersion, and when the water medium disperses them, they are generally named hydrophilic.	b). They have less affinity for the medium's dispersion, and when the water medium disperses them, they are generally named as hydrophobic.
c). The lyophilic solvent gives a reversible reaction.	c). The lyophobic solvent gives an irreversible reaction.
d). The lyophilic sol has weak Tyndall effects.	d). The lyophobic sol has strong Tyndall effects.
e). The lyophilic particles are generally not detectable under an ultra microscope.Examples of lyophilic colloids are starch or protein dissolved in water.	e). The lyophobic particles are generally detectable under an ultra microscope.Examples of lyophobic colloids are aluminium hydroxide and ferric hydroxide dissolved in water.

Hence, the correct option is A that is behavior towards dispersion medium.

Note: The colloidal are of two types; one is lyophilic, and another one is lyophobic. Both are usually different in their dispersion affinity and give different reactions when they react with water.