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.