Which of the following is the largest size nanomaterial?

Which of the following is an example of a hydrophobic sol?

The protecting power of lyophilic colloidal sol is expressed in terms of

Which of the following is a lyophobic colloidal solution?

The ability of an ion to bring about coagulation of a given colloid depends upon

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