Which among the following is an example of an emulsion?

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.

Bredig's arc method cannot be used to prepare a colloidal solution of which of the following?

Muddy water can be purified through coagulation using

Which of the following is an example of multimolecular colloids?

The charge on $As_2S_3$ sol is due to the adsorbed