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Comparison of Physisorption and Chemisorption

stability of ...

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stability of lyophilic sols are due to whether charge or layer of dispersion medium?

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Q. Which of the following statements is/are correct regarding the stability of sol?
(i) Lyophilic sols are stabilized due to a layer of solvent around sol particles.
(ii) Lyophobic sols are stabilised due to presence of charge.
(iii) Addition of lyophilic brings in more stability to lyophobic.
(iv) Addition of lyophobic brings in more stability to lyophobic.

Q. Assertion :Lyophilic sols are reversible sols. Reason: Lyophilic sols can be reconstituted by simply remixing the dispersed phase and dispersion medium.

Q. Assertion :The preparation of lyophobic sol is more complex than the lyophilic sols. Reason: Stabilizers are required to add extra stability to lyophilic sols.

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^{-}

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

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

The factors which are responsible for the stability of lyophilic sols are:

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