A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium is classified as .........

1.  Solid sol

2.  Gel

3.  Emulsion

4.  Sol

 
 
HINT: It is general definition of sol.
 
Explanation: Sol is a colloidal system in which a solid substance is a dispersed phase and a liquid is a dispersion medium                         e.g., paint, cell fluids, etc.
                    In paints, solid coloring particles are dissolved in the liquid dispersion mediu