Question

Shaving cream produces foam. What kind of colloid is shaving cream?
A.Liquid dispersed in a gas.
B.Gas dispersed in a liquid.
C.Solid dispersed in a liquid.
D.Solid dispersed in a gas.

Answer 1

As we know that a colloid is mixture of particle between $1\text{ }to\text{ }1000$ nanometers in diameter, and yet it is still capable of being an evenly distributed through solution. These also refer to colloidal dispersion because substances remain dispersed as well as don’t settle down at the bottom of the container.

Complete step-by-step answer: We know the basics that colloidal dispersion property is closely linked to high surface area of dispersal phase, as well as these interface chemistry. The natural combination of this colloid along with surface chemistry represent primary research space as well as we can see variety in categories of colloid depending on these basic properties. The example for colloidal solutions could be given as smog, fog, as well as spray. For these colloid examples, dispersed phase is liquid as well as dispersion medium of gas. Usually, these are termed as liquid aerosol.
Colloid consist of a disperse phase along with disperse medium here disperse medium is a gas which consist of isobutane as well as isopentane/ the volatile propellant along with the liquid is dispersed phase, shaving cream produces foam which are colloidal system whereas gas phase is disperse within liquid continuous phase. All whip as well as shaving cream lies under the category of colloid.

Therefore, Option B is correct option i.e. Shaving cream produces foam and shaving cream is a colloid of Gas dispersed in a liquid.

Note: Note that the liquid is strongly absorbed onto the surface of the particle by making interface between the particle as well as the liquid, which is the same between the liquid along with itself. It makes the system inherently stable because of reduction in Gibb free energy when particles are dispersed.