Question

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

(a) Gel

(b) Foam

(c) Solid sol

(d) Liquid sol

I have been asked this question in a job interview.

This is a very interesting question from Colloids topic in portion Surface Chemistry of Engineering Chemistry II

Answer 1

Correct option is (c) Solid sol

To explain I would say: We know that solid sol is the colloidal solution of a solid and a solid. Since there is a mixture of solid and solid, the bond between them is quite strong. Thus it is considered to be the strongest colloid.