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Question

Choose the odd one out. Give reasons for the choice.

Sand in water, powdered chalk in water, Fog, Dust in air.


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Solution

Types of solutions:

SuspensionColloids
  • Suspensions are heterogeneous mixtures.
  • The particles in a suspension are larger than that of a solution and these particles can be separated by filtration process.
  • When the suspension is kept undisturbed, the particles settle down.
  • Examples of suspensions: Sand in water, Powdered chalk in water, Dust in air
  • Colloids are heterogeneous mixtures. Every colloid contains two parts - colloidal particles (dispersed phase) and dispersing medium. The particles of colloids (solid or liquid) will have intermediate sizes between suspension and solution particles.
  • The particles of colloids do not dissolve but get dispersed in the medium and cannot be separated by filtration.
  • Example of colloids: Fog

Therefore, Fog is an odd one because it is a type of colloid while all others are suspension.


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