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.

(ii) only

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(i) and (iv) only

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(i), (ii) and (iii) only

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All of these.

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Solution

The correct option is B (i), (ii) and (iii) only
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.
Hence, option C consisting of the first three statements regarding the stability of sol is the right answer.

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Similar questions

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. The stability of lyophobic sols is due to:

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. 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):

Q. Lyophilic sols are more stable than lyophobic sols because:

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