Identify the dimensional nature of nanoparticles.

Milk is an example of a/an ...... .

For arsenious sulphide sol,which one of the following salt solutions will be most effective for coagulation?

Which of the following is an example of $water$ in $oil$ type emulsion?

How many of the following statements are correct $:$
$(i)$ When freshly prepared precipitate are converted into colloidal solution then process is called peptization.
$(ii)$ Lyophilic sol are mostly of inorganic nature.
$(iii)$ Lyophilic sol are highly solvated as particles have great affinity for solvent.
$(iv)$ Lyophobic sols are reversible sols so special methods are required to prepare them.

Colloidal solution of gold cannot be prepared by: