Match List - I with List - II.

Choose the correct answer from the options given below:

(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

The correct answer is Option 2. (A)-(III), (B)-(IV), (C)-(I), (D)-(II).

Let us break down each item in List-I and List-II and understand why they match:

(A) Cheese: (III) Gel

Gel is a colloidal system where a liquid is dispersed in a solid. Cheese is an example of a gel, where water is dispersed in a protein matrix. In the case of cheese, the solid matrix (primarily proteins like casein) traps water, creating a semi-solid structure.

(B) Cell fluids: (IV) Sol

Sol is a colloidal system in which solid particles are dispersed in a liquid. Cell fluids, such as cytoplasm, are often classified as sols. In these, proteins, enzymes, and various other solid particles are dispersed in water, which acts as the liquid medium.

(C) Hair cream: (I) Emulsions

Emulsion is a type of colloidal system where two immiscible liquids, typically oil and water, are dispersed within each other. Hair creams are classic examples of emulsions where oil droplets are dispersed in water (oil-in-water emulsion) or vice versa. The stabilizers help maintain the dispersion.

(D) Clouds: (II) Aerosol

Aerosol is a colloidal system where solid or liquid particles are dispersed in a gas. Clouds are examples of aerosols where tiny water droplets or ice crystals are dispersed in air (the gaseous medium). This is why clouds fall under the category of aerosols.

This explains why the correct answer is option 2.