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Which one of ...

Question

Which one of the sols acts as protective colloid?

A

A u

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B

Gelatin

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C

F e (O H)_{3}

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D

A s_{2} S_{3}

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Solution

The correct option is B Gelatin

The lyophilic colloids that helps to stabilize lyophobic colloid is called as protective colloid.
So, here gelatin is act as protective colloid, while $A s_{2} S_{3} and F e (O H)_{3}$ are kind of sols and gold is an metal.

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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. Which one of the following will act as best protective colloid?

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 protecting power of lyophilic colloidal sol is expressed in terms of

{6 \times 10}^{- 5}

g of a protective colloid was added to a 20ml of standard gold sol, the precipitation of latter was just prevented on addition of 2ml of 10%NaCl solution. The gold number of protective colloid is?

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