Electrophoresis is used

When a few drops of dilute $HCl$ are added to a freshly prepared precipitate of ferric hydroxide,a reddish-brown colloidal solution is obtained. This phenomenon is known as .......

Assertion : Colloidal solutions are stable but colloidal particles do not settle down.
Reason : Brownian movement counters the force of gravity actively on colloidal particles.

Which of the following substances is not used for preparing lyophilic sols?

Consider the following statements for a gold sol:
$(I)$ It is a macromolecular colloid.
$(II)$ It is a lyophobic sol.
$(III)$ It is a negatively charged sol.
$(IV)$ It is a multimolecular colloid.
$(V)$ It is an associated colloid.
The correct statements are:

Various types of colloids are given below. Match Column $X$ with Column $Y$.

$X$ (Colloid)	$Y$ (Classification)
$I$. Smoke	$A$. Sol
$II$. Gelatin	$B$. Aerosol
$III$. Soap lather	$C$. Emulsion
$IV$. Milk	$D$. Foam