Milk is a colloid in which

Match the following types of colloidal systems in List-$I$ with their corresponding names in List-$II$.

List-$I$	List-$II$
$(A)$ Solid dispersed in liquid	$(I)$ Emulsion
$(B)$ Liquid dispersed in liquid	$(II)$ Foam
$(C)$ Gas dispersed in liquid	$(III)$ Gel
$(D)$ Liquid dispersed in solid	$(IV)$ Sol
	$(V)$ Aerosol

The protecting power of lyophilic colloidal sol is expressed in terms of

Assertion : Aqueous gold colloidal solution is red in colour.
Reason : The colour arises due to scattering of light by colloidal gold particles.

On adding a few drops of dilute $HCl$ or $FeCl_3$ to freshly precipitated ferric hydroxide,a red-coloured colloidal solution is obtained. This phenomenon is called:

The disperse phase in colloidal iron $(III)$ hydroxide and colloidal gold is positively and negatively charged,respectively. Which of the following statements is $NOT$ correct?