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Q.

What is the size of colloidal particle?

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Detailed Solution

The size of a colloidal particle ranges between 1 nanometer (nm) and 1000 nanometers (or 1 micron).

  • Colloidal particles are intermediate in size between true solution particles and suspension particles.
  • They are large enough to scatter light (Tyndall effect) but too small to settle under gravity.
Type of MixtureParticle Size RangeVisibility
True SolutionLess than 1 nmInvisible
Colloid1–1000 nmVisible under microscope
SuspensionMore than 1000 nmVisible to naked eye

Examples of colloids include milk, fog, and jelly. Their unique size gives them stability and special optical properties, making them useful in industries, food, and medicine.

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