Which of the following substances is classified as a macromolecular colloid?

$A$ colloidal solution can be purified by

Match the following types of colloidal systems given in List-$I$ with their respective names given in List-$II$.

List-$I$	List-$II$
$(A)$ Solid dispersed in liquid	$(I)$ Emulsion
$(B)$ Liquid dispersed in liquid	$(II)$ Foam
$(C)$ Gas dispersed in liquid	$(III)$ Gel
$(D)$ Liquid dispersed in solid	$(IV)$ Sol
-	$(V)$ Aerosol

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:

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$a$. Cheese	$i$. dispersion of liquid in liquid
$b$. Pumice stone	$ii$. dispersion of liquid in gas
$c$. Hair cream	$iii$. dispersion of gas in solid
$d$. Cloud	$iv$. dispersion of liquid in solid

Choose the most appropriate answer from the options given below:

Identify the correct molecular picture showing what happens at the critical micellar concentration $(CMC)$ of an aqueous solution of a surfactant $(\circ \text{ polar head; } \sim \text{ non-polar tail; } \bullet \text{ water})$.