The Brownian movement exhibited by colloidal particles is a ....... property.

$Statement-1$: 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 $CMC$.

Foam is a colloidal solution of $......$.

In each of four separate beakers $(I, II, III, IV)$,$X \ mL$ of $y \ M \ Fe_2O_3 \cdot xH_2O$ colloidal solution is present. Equal volume and equal concentration of $KCl, K_4[Fe(CN)_6], K_3PO_4$ and $K_2SO_4$ were added into $I, II, III$ and $IV$ respectively. The efficiency of precipitation in these beakers follows the order:

The colloidal solution used to treat stomach disorders is

$A$ system of cellulose dispersed in alcohol is known as a ...... .