Question

Which of the following form of colloid is considered to be the lightest colloid?

(a) Gaseous foam

(b) Solid sol

(c) Sol

(d) Liquid sol

This question was addressed to me in unit test.

I'd like to ask this question from Colloids in section Surface Chemistry of Engineering Chemistry II

Answer 1

Right answer is (a) Gaseous foam

The explanation is: We know that the gaseous foam is the colloidal solution of gaseous molecules and liquid. Thus there exists a lighter bond between the particles. Thus this is considered as the lightest colloid.