Which of the following impurities can be separated from a colloidal solution by electrodialysis?

Identify the correct statements from the following:
$(i)$ $A$ closed vessel containing $90 \%$ $CO_2$ and $10 \%$ $O_2$ is an aerosol.
$(ii)$ Milk is an emulsion.
$(iii)$ Smoke is an aerosol.
$(iv)$ Peptisation is a method of purification of colloidal solution.
$(v)$ Ultrafiltration is a method of purification of colloidal solution.

The purification of colloids is carried out by which of the following processes?

The migration of dispersion medium under the influence of an electric potential is called

In which of the following does coagulation not occur?

The isoelectric point is the $pH$ at which: