Question -
Which characteristic is true with respect to colloids?
Options:
A .  They always have two phases.
B .  Dispersion medium is always in liquid state.
C .  They are homogeneous.
D .  The components can be separated by filtration.
Answer: Option A : A Acolloidis a heterogeneous mixture in which the particles of the dispersed phase are distributed non-uniformly in the dispersion medium. A colloidal solution is always made up of two phases- dispersion medium and dispersed phase. The two phases of a colloid can be a solid, a liquid or a gas. However, its constituent particles are very small in size. Hence, it cannot be separated by filtration. Examples of colloids are blood, paint, etc.
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