Question:

Smoke is an example of which type of colloid?

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Smoke = solid particles in gas → always classified as aerosol.
Updated On: Jun 19, 2026
  • Sol
  • Aerosol
  • Foam
  • Solid sol
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The Correct Option is B

Solution and Explanation

Step 1: Understanding colloidal systems.
Colloids are classified based on the dispersed phase and dispersion medium. Smoke consists of solid particles dispersed in a gas (air).

Step 2: Identifying phase type.

Here, solid particles (carbon, ash) are dispersed in a gaseous medium. This type of colloid is called an aerosol.

Step 3: Definition of aerosol.

An aerosol is a colloidal system where either solid or liquid particles are dispersed in a gas. Examples include smoke and fog.

Step 4: Eliminating other options.

Sol = solid in liquid, Foam = gas in liquid, Solid sol = solid in solid. None match smoke composition.

Step 5: Final conclusion.

Thus, smoke is classified as an aerosol.
Final Answer: \[ \boxed{\text{Aerosol}} \]
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