The solution of rubber is an example of

Blood contains

In electrophoresis,the colloidal particles of starch:

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

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 powers is

The surface tension of a soap solution is $30 \times 10^{-3} \, N/m$. The work done to increase the surface area of a soap film from $5 \, cm \times 5 \, cm$ to $10 \, cm \times 10 \, cm$ is: