Which of the following statements is not true for a lyophilic sol?

Light scattering in colloidal particles is

Which property of colloidal solution is independent of charge on the colloidal particles?

Gold numbers of some colloids are: Gelatin $0.005-0.01$,Gum arabic: $0.15-0.25$; Oleate: $0.04-1.0$; Starch: $15-25$. Which among these is a better protective colloid?

The coagulation of $100 \, mL$ of a colloidal sol of gold is completely prevented by the addition of $0.25 \, g$ of a substance '$X$' to it before adding $10 \, mL$ of $1 \% \ NaCl$ solution. The gold number of '$X$' is:

Electrophoresis is used