The stabilisation of a lyophobic colloid is due to

Photographic plates are prepared by coating an emulsion of which of the following in gelatin?

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.

Which of the following methods can be used to destroy a sol?

Peptization denotes

State the $Hardy-Schulze$ rule.