Match List - I with List - II.

List-I	List-II
A Lyophilic colloid	I Liquid-liquid colloid
B Emulsion	II Protective colloid
C Positively charged colloid	III $$FeCl_3 + NaOH$$
D Negatively charged colloid	IV $$FeCl_3$$ + hot water

Choose the correct answer from the options given below

Let us match each item in List-I with the correct item in List-II.

A. Lyophilic colloid → II (Protective colloid)

Lyophilic colloids (solvent-loving) are stable colloids that can protect lyophobic colloids from coagulation. They are also called protective colloids. Examples include gelatin, starch, and gum arabic.

B. Emulsion → I (Liquid-liquid colloid)

An emulsion is a colloidal system where both the dispersed phase and the dispersion medium are liquids. For example, milk is an emulsion of fat droplets in water. Hence, emulsion is a liquid-liquid colloid.

C. Positively charged colloid → IV ($$FeCl_3$$ + hot water)

When $$FeCl_3$$ is added to hot water, it hydrolyzes to form a colloidal solution of $$Fe(OH)_3$$ which is positively charged. The $$Fe^{3+}$$ ions are preferentially adsorbed on the $$Fe(OH)_3$$ particles, giving them a positive charge.

D. Negatively charged colloid → III ($$FeCl_3 + NaOH$$)

When $$FeCl_3$$ is mixed with excess $$NaOH$$, the $$Fe(OH)_3$$ sol formed adsorbs $$OH^-$$ ions from the excess NaOH, making the colloidal particles negatively charged.

The correct matching is: A-(II), B-(I), C-(IV), D-(III)

Hence, the correct answer is Option A.