Alum is a water purifier because it

The apparatus used for the precipitation of carbon particles from smoke is known as.............

Blood may be purified by

$Statement-1$: Micelles are formed by surfactant molecules above the critical micellar concentration $(CMC)$.
$Statement-2$: The conductivity of a solution having surfactant molecules decreases sharply at the $CMC$.

An emulsifier:

Identify the example of zero-dimensional $(0D)$ nanostructure from the following.