When a substance comes in colloidal state,the surface area of the particles:

$Statement-1$: 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 $CMC$.

Sunscreen lotions contain nanoparticles of:

What is the movement of colloidal particles under the influence of an electric field called?

How many types of emulsions are there? Which are they?

Which of the following is a property of a colloid?