The gold number is maximum for which of the following lyophilic sols?

Identify the correct statements from the following :
$I$. Sulphur sol is an example of a multimolecular colloid.
$II$. Tyndall effect is observed when the diameter of the dispersed particles is not much smaller than the wavelength of the light used.
$III$. The process of removing a dissolved substance from a colloidal solution by means of diffusion through a suitable membrane is called peptisation.
$IV$. Eosin,gelatin are examples of negatively charged sols.

Brownian motion arises due to ....

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

Which of the following can form a colloidal sol with water?

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$A$. Negatively charged sol	$I$. $Fe_{2}O_{3} \cdot xH_{2}O$
$B$. Macromolecular colloid	$II$. $CdS$ sol
$C$. Positively charged sol	$III$. Starch
$D$. Cheese	$IV$. $A$ gel

Choose the correct answer from the options given below: