Question

What is the dispersed phase and dispersion medium of the following colloidal systems?

• A. Smoke
• B. Smoke: Dispersed phase = Solid, Dispersion medium = Gas; Paint: Dispersed phase = Solid, Dispersion medium = Liquid
• C. Smoke: Dispersed phase = Gas, Dispersion medium = Solid; Paint: Dispersed phase = Liquid, Dispersion medium = Solid
• D. Smoke: Dispersed phase = Liquid, Dispersion medium = Gas; Paint: Dispersed phase = Gas, Dispersion medium = Liquid

Hint:

In colloids, the dispersed phase is the component present in smaller amounts and is uniformly distributed in the dispersion medium. Common types include solid in gas (e.g., smoke), solid in liquid (e.g., paint), liquid in liquid (e.g., emulsions), and gas in liquid (e.g., froth).

Answer 1

The Correct Option is A

Step 1: Analyze Smoke
Smoke is a colloidal system where solid particles (soot or carbon) are dispersed in a gaseous medium (air).
Dispersed phase: Solid (soot or carbon)
Dispersion medium: Gas (air)
Step 2: Analyze Paint
Paint is a colloidal system where solid particles (pigments) are dispersed in a liquid medium (solvent such as water or oil).
Dispersed phase: Solid (pigments)
Dispersion medium: Liquid (solvent)
Step 3: Conclusion For Smoke: $$ \text{Dispersed phase: Solid (soot or carbon)}, \quad \text{Dispersion medium: Gas (air)} $$ For Paint: $$ \text{Dispersed phase: Solid (pigments)}, \quad \text{Dispersion medium: Liquid (solvent)} $$