An example of a solid sol is

Which of the following has the lowest coagulation value for the coagulation of $As_2S_3$ colloidal solution?

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

Lyophilic sols are:

Into how many parts are colloidal sols divided according to the nature of interaction between the dispersed phase and the dispersion medium?

Emulsifiers are generally .......