Fog is an example of a colloidal system of:

When a solution of $AgNO_3$ is added to a solution of $KI$,a negatively charged sol is formed when they are in which of the following proportions?

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.

Give information about Brownian movement.

Identify the correct statements from the following:
$I$) Sulphur sol is an example of a multimolecular colloid.
$II$) Starch sol is an example of an associated colloid.
$III$) Artificial rubber is an example of a macromolecular colloid.

Blue colour of water in sea is due to