Sodium lauryl sulphate is an example of:

The correct statement$(s)$ related to colloids is(are):
$(A)$ The process of precipitating colloidal sol by an electrolyte is called peptization.
$(B)$ Colloidal solution freezes at a higher temperature than the true solution at the same concentration.
$(C)$ Surfactants form micelles above the critical micelle concentration $(CMC)$. $CMC$ depends on temperature.
$(D)$ Micelles are macromolecular colloids.

Which among the following is an example of a $2$-dimensional nanostructure?

Assertion : Sky appears blue.
Reason : Colloidal particles of dust scatter blue light.

Identify the dimensional nature of nanoparticles.

$A$ liquid aerosol is a colloidal system of