Tyndall effect is observed due to

$Statement-1$: 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 $CMC$.

Which one of the following is not a surfactant?

The white of an egg is partly coagulated by heating,which can be converted back into a colloidal sol by adding some pepsin and a little $HCl$. This process is called:

Which of the following is an incorrect statement?

The zig-zag motion (erratic motion) of particles in a colloid was observed by: