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Coagulation

Lyophilic col...

Question

Lyophilic colloids that shows the property of protecting lyophobic colloids are also called as:

A

Protective colloids

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B

Non-Protective colloids

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C

Both protective and non protective

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D

Associated colloids

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Solution

The correct option is A
Protective colloids

Lyophilic colloids used for protecting lyophobic colloids are called protective colloids.

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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. 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.

Colloidal silica is a protective colloid.

Protection is the property of lyophilic colloid.

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