Alum purifies muddy water by

The number of colloidal systems from the following,which will have 'liquid' as the dispersion medium,is $.........$.
Gem stones,paints,smoke,cheese,milk,hair cream,insecticide sprays,froth,soap lather.

When a few drops of dilute $HCl$ are added to a freshly prepared precipitate of ferric hydroxide,a reddish-brown colloidal solution is obtained. This phenomenon is known as .......

Ferric chloride is applied to stop bleeding because :-

The most appropriate method of making egg albumin sol is

Medicines are more effective if they are used in.......