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

What is the movement of colloidal particles under the influence of an electric field called?

Which of the following exhibits the minimum coagulating power for the precipitation of a positively charged ferric oxide sol?

In the following reaction for the preparation of gold sol,$a, b, c, x, y$ and $z$ are $a AuCl_3 + b HCHO + c H_2 O \longrightarrow x Au (\text{sol}) + y HCO_2 H + z HCl$. Find the correct values for the coefficients.

At the critical micelle concentration $(CMC)$,..........

The density of gold is $19 \, g/cm^3$. If $1.9 \times 10^{-4} \, g$ of gold is dispersed in $1 \, L$ of water to form a sol of spherical gold particles of radius $10 \, nm$,find the number of gold particles per $nm^3$ in the sol.