Milk is an example of which type of colloid?

Flocculation value is expressed in terms of

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.

Which of the following is not a macromolecular colloid?

Which of the following ions will be most effective in coagulating the $As_2S_3$ sol?

Which of the following properties is responsible for the development of colour in colloids?