Coagulation of lyophilic sol is done by

addition of suitable electrolyte

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addition of suitable solvent like alcohol, acetone, etc.

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Both (a) and (b)

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None of the above

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Solution

The correct option is C Both (a) and (b)
Lyophilic colloids coagulate hardly due to its stablility.
Factor responsible for the stability of lyophilic sol is
1. Charge of colloidal particles
2. Solvation of colloidal particles

Thus, to coagulate the lyophilic sol, its stability should be removed.

Addition of suitable electrolyte will remove the stability due to charged colloidal particle.

Lyophilic colloids coagulate hardly by the addition of electrolyte due to protective layer of dispersion medium.

Therefore, an suitable solvent should be added to remove the solvation of sol.

In case of hydrophilic sols, we need to add dehydrating agent in addition to electrolyte to remove the hydration of sol.

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Similar questions

Q. Lyophilic sols could be coagulated by

Q. Lyophilic colloidal sols are much more stable than lyophobic colloidal sols. This is due to the extensive solvation of lyophilic colloidal sols, which form a protective layer outside it which prevents it from forming associated colloids. Lyophilic colloidal sols also protect lyophobic colloidal sols from precipitation by the action of electrolytes. This is due to the formation of a protective layer by the lyophilic sols outside lyophobic sols. Lyophilic sols are also called protective sols.
Gelatin (lyophilic) protects gold sol (lyophobic) from coagulation on the addition of a solution of sodium chloride. The protective powers of different colloidal sols are measured in terms of gold number.
Gold number is defined as the amount of protective sol in milligrams that prevents the coagulation of 10 mL of a given gold sol on adding 1 mL of a

10 %

solution of sodium chloride. Thus, the smaller the gold number of a lyophilic sol, the greater is the protective power.

[A g I] I^{-}

colloidal sol can be coagulated by the addition of a suitable cation. 1 mol

[A g I] I^{-}

requires

A g N O_{3}, P b (N O_{3})_{2}

F e (N O_{3})_{3}

as (in moles):

Which of the following is/are correct ?
i) lyophobic sols are less stable
ii) lyophilic sols are reversible
iii) lyophobic sols are coagulated by adding electrolytes
iv) lyophobic sols are more hydrated

Q. What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated?

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