Match List-I with List-II

	List-I		List-II
(A)	negatively charged sol	(I)	${\mathrm{Fe}}_2{\mathrm{O}}_3·{\mathrm{xH}}_2\mathrm{O}$
(B)	macromolecular colloid	(II)	$\mathrm{CdS}$ sol
(C)	positively charged sol	(III)	Starch
(D)	Cheese	(IV)	a gel

Choose the correct answer from the options given below

Colloidal particles always carry an electric charge. The nature of this charge is the same on all the particles in a given colloidal solution and may be either positive or negative. 

Negatively charged sol $\Rightarrow \mathrm{CdS}$

Positively charged sol $\Rightarrow {\mathrm{Fe}}_2{\mathrm{O}}_3.{\mathrm{xH}}_2\mathrm{O}$

Macromolecular colloids are individual particles that are large enough to be considered colloids (diameter around 100 nm). These particles are made up of chemicals with a high molecular weight.

Macromolecular colloid $\Rightarrow$Starch

Gel $\Rightarrow$ Cheese