Which of the following colloids are formed when hydrogen sulphide gas is passed through a cold solution of arsenious oxide?

Some substances behave as electrolytes in dilute solutions and as colloids in their concentrated solutions. Their colloidal forms are said to form

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.

Which of the following anions has the maximum coagulating power for the precipitation of a positive sol?

The size of colloidal particles varies from:

The gold numbers of protective colloids $A, B, C,$ and $D$ are $0.50, 0.01, 0.10,$ and $0.005$ respectively. The correct order of their protective power is: