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Methods to Form Lyophobic Colloids

Colloidal sil...

Question

Colloidal silica is a protective colloid.

A

True

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B

False

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Solution

The correct option is A True
The given statement is True.
Colloidal silica is a protective colloid. Lyophilic colloids are more stable than lyophobic colloids. Hence, lyophilic colloids protect lyophobic colloids from precipitation by electrolytes. Such lyophilic colloids are called protective colloids.

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Q. Assertion :Lyophilic colloids such as starch, gelatin etc., act as protective colloids. Reason: Protective power of lyophilic colloids is expressed in terms of gold number.

Q. The gold numbers of some colloidal solutions are given below.

Colloidal solution	Gold number
A	0.01
B	2.5
C	20

The protective nature of these colloidal solutions follow the order :

Q. Assertion :Lyophilic colloids have a unique property of protecting lyophobic colloids. Reason: Lyophilic colloids are extensively solvated.

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}

Q. The gold numbers of some colloidal solutions are given below:

Colloidal solution	Gold number
$A$	$0.01$
$B$	$2.5$
$C$	$20$

The protective powers of these colloidal solutions follow the order:

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