Question

If a solid is dispersed in a liquid, the colloid is known as:
a.) Gel
b.) Sol
c.) Emulsion
d.) None of the above

Answer 1

Hint: Colloid is a combination of molecules mixed through other substances that will not settle out or join with the other substance. And in this problem solid is mixed with liquid and it gets dispersed.

Step by step solution:
We know that dispersion is also called scatter, spread and variability. And it is the extent to which a distribution is stretched or squeezed. Solid dispersion is defined as dispersion of one or more active ingredients in an inert carrier at solid state prepared by melting method or melting solvent method.
Here we see some simple definitions:
Gel: Gel is a dispersion of molecules of a liquid within a solid in which liquid particles are dispersed in the solid medium. Example : fruit jelly
Sol: It is a colloidal suspension with solid particles as dispersed phase dissolve in a liquid i.e.dispersion medium. Example: blood and paint.
Emulsion: It is a mixture of two or more liquids that are normally immiscible. Example: egg yolk and butter.
So, from the above definition and given problem we can say that option “B” is the correct option. Others are incorrect because one is dispersion of liquid in solid and the other is a mixture of two liquids.

Note: Sols are quite stable and show the Tyndall effect. Artificial sols may be prepared by dispersion or condensation. And the process of mixing liquids to form an emulsion is called emulsification.