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Classification of Colloids - Based on nature of interaction

The protectiv...

Question

The protective action of different colloids is compared in terms of -

A

oxodation

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B

gold number

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C

reyonld number

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D

no option

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Solution

The correct option is B gold number
The protective action of different colloids is compared in term of gold number.
The lyophobic colloid is protected from coagulation by using a protective lyophilic colloid. The protection power is expressed in terms of gold number which is the amount of the protective colloid in milligrams needed to prevent the coagulation of a standard $10$ mL gold sol when $1$ mL of $10 %$ solution of sodium chloride is added to it.
Smaller the gold number, greater will be the protection power.

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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. 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 protective power of the lyophilic colloids is expressed in terms of gold number, a term introduced by Zsigmondy. The gold number is the number of milligrams of the protective colloid that prevents the coagulation of

10 m L

of a red gold sol when

1 m L

10

percent solution of sodium chloride is added to it.

Which of the following statement(s) is/are correct

The protective power of the lyophilic colloids is expressed in terms of gold number a term introduced by Zsigmondy. Gold number is the number of milligrams of the protective colloid which prevent the coagulation of

10

ml of red gold sol. When

1

10

percent solution of sodium chloride is added to it. Thus, smaller the gold number of lyophilic colloid, the greater is the protective power.

On addition of one mL of solution of

10 %

N a C l

10

mL of red gold sol in presence of

0.025

g of starch, the coagulation is just prevented. The gold number of starch is :

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