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Question

Difficulty: EasyTypes of Solutions: True Solutions, Suspensions, and Colloidal Systems

Smoke consists of fine solid particles dispersed in a gaseous medium. Which of the following colloidal classifications correctly describes smoke?

  1. AerosolAnswer
  2. B
    Emulsion
  3. C
    Foam
  4. D
    Sol

Answer

Smoke is classified as an aerosol because it consists of solid particles dispersed in a gas.
Smoke consists of microscopic solid carbon particles suspended in air (a gas). Any colloidal dispersion where a solid or liquid is dispersed in a gas is categorized as an aerosol.

Step-by-Step Solution

1
Identify the dispersed phase and the dispersion medium of smoke.
Dispersed phase = solid (carbon/ash particles), Dispersion medium = gas (air).
Classification of colloids depends on the physical states of the dispersed phase and dispersion medium.
2
Match the phase combination (solid in gas) to the standard colloidal nomenclature.
Solid dispersed in a gas is termed a solid aerosol.
Colloids with a gaseous dispersion medium are broadly categorized as aerosols.

Key Concept

Classification of Colloidal Systems based on Dispersed Phase and Dispersion Medium
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Topics

Types of Solutions: True Solutions, Suspensions, and Colloidal Systems