Which of the following has the minimum coagulating power?

The colloidal solution of gelatin is known as:

The density of gold is $19 \ g/cm^3$. If $1.9 \times 10^{-4} \ g$ of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius $10 \ nm$,then the number of gold particles per $mm^3$ of the sol will be

The size of particles in suspension,true solution,and colloidal solution varies in the order:

Which of the following methods is used for sol destruction?

What happens when an electric field is applied to a colloidal solution?