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Question

What happens when a lyophilic sol is added to a lyophobic sol?

A
Lyophilic sol is protected.
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B
Lyophobic sol is protected.
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C
Both the sols are coagulated.
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D
Electrophoresis takes place.
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Solution

The correct option is B Lyophobic sol is protected.
  • Lyophilic sols are more stable than lyophobic sols. This is due to the fact that lyophilic colloids are extensively solvated, i.e., colloidal particles are covered by a sheath of the liquid in which they are dispersed.
  • Lyophilic colloids have a unique property of protecting lyophobic colloids.
  • When a lyophilic sol is added to the lyophobic sol, the lyophilic particles form a layer around lyophobic particles and thus protect the latter from electrolytes.
  • Lyophilic colloids used for this purpose are called protective colloids.

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