Animated Solution for Chemistry - Surface Chemistry: Match the following:\\ \begin{array}{ll} \text{I. Foam} & \text{(A) Smoke} \\ \text{II. Gel} & \text{(B) Cell fluid} \\ \text{III. Aerosol} & \text{(C) Jellies} \\ \text{IV. Emulsion} & \text{(D) Rubber} \\ & \text{(E) Froth} \\ & \text{(F) Milk} \end{array}

They are classified based on the physical state of their two main components: the dispersed phase (the substance being distributed) and the dispersion medium (the substance in which the phase is distributed).

In this problem, we are tasked with matching four specific types of colloids—Foam, Gel, Aerosol, and Emulsion—with their real-world examples. Let's break them down one by one.

Foam Imagine shaking a bottle of soapy water. You will notice bubbles forming as air gets trapped within the liquid. This is exactly what a foam is! In a foam, the dispersed phase is a gas, and the dispersion medium is either a liquid or a solid. Looking at our given options, Froth (E) is the perfect example of a gas trapped in a liquid.

II. Gel Think about the jellies you enjoy eating. They maintain their shape much like a solid, yet they are soft and squishy because they contain a significant amount of liquid trapped inside a solid network. Therefore, in a gel, the dispersed phase is a liquid, and the dispersion medium is a solid. Naturally, Gel matches perfectly with Jellies (C).

III. Aerosol The prefix "aero" immediately brings to mind air or gas. An aerosol is formed when fine solid particles or liquid droplets are suspended in a gas. When wood burns, it releases unburnt solid carbon particles that float in the air, creating smoke. Thus, the dispersed phase is solid, and the dispersion medium is gas. Aerosol correctly pairs with Smoke (A).

IV. Emulsion Emulsions are a very special and common type of colloid. They occur when both the dispersed phase and the dispersion medium are liquids that typically do not mix well, such as oil and water. Milk is a classic biological emulsion where tiny droplets of liquid fat are uniformly dispersed throughout liquid water. Hence, Emulsion matches with Milk (F).

Now, let's compile all our logical deductions into a final sequence: - I (Foam) matches with (E) Froth - II (Gel) matches with (C) Jellies - III (Aerosol) matches with (A) Smoke - IV (Emulsion) matches with (F) Milk

This gives us the sequence: (I)-(E), (II)-(C), (III)-(A), (IV)-(F).

Scanning through the given choices, we find that this exact sequence corresponds to Option (c). While this might seem like a simple memory-based question, understanding the underlying physical states of the dispersed phase and dispersion medium makes the concepts unforgettable!