Which of the following is correctly matched?

Among the colloids cheese $(C)$,milk $(M)$ and smoke $(S)$,the correct combination of the dispersed phase and dispersion medium,respectively is

Under the influence of an electric field,the particles in a sol migrate towards the cathode. The coagulation of the same sol is studied using $NaCl$,$Na_2SO_4$,and $Na_3PO_4$ solutions. Their coagulating values will be in the order:

Match List-$I$ with List-$II$ and select the correct option:

List-$I$	List-$II$
$I$. Colloidal antimony	$A$. Kala-azar
$II$. Silver sol	$B$. Intramuscular injection
$III$. Milk of magnesia	$C$. Eye lotion
$IV$. Gold sol	$D$. Stomach disorder

Equal volumes of two $AgI$ sols are mixed together. The first sol is obtained by adding $AgNO_3$ to a slight excess of $KI$,and the second sol is obtained by adding $KI$ to a slight excess of $AgNO_3$. What happens when they are mixed?

$A$ colloidal system in which gas bubbles are dispersed in a liquid is known as