The macromolecular colloids among the following are:
$I$. Starch solution
$II$. Sulphur sol
$III$. Synthetic detergent
$IV$. Synthetic rubber

What does the gold number indicate?

The correct statements with respect to dialysis of colloidal solution are
$I$. Colloidal particles can pass through the membrane.
$II$. Animal bladder can be used as membrane.
$III$. Cellophane is not used as membrane.
$IV$. Ions or small molecules can diffuse through membrane into water.

Identify the method of preparation of a colloidal sol from the following.

Explain Electrophoresis.

Mixing of positively charged colloidal solution with negatively charged colloidal solution brings $ . . . . . . $. The decreasing order of coagulating power of $Na^{+}$,$Ba^{2+}$ and $Al^{3+}$ for negatively charged colloidal solution is $ . . . . . . $?