The number of colloidal systems from the following, which will have 'liquid' as the dispersion mediu

Question

The number of colloidal systems from the following, which will have 'liquid' as the dispersion medium, is:
 Gem stones, paints, smoke, cheese, milk, hair cream, insecticide sprays, froth, soap lather.

Professor PC Thomas Classes · Answer

Paints (solid in liquid), milk (liquid in liquid), hair cream (liquid in liquid), froth (gas in liquid), and soap lather (gas in liquid) have liquid dispersion media. Total = 5.