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Coagualation of Lyophilic Sols

Which of the ...

Question

Which of the following is/are incorrect statements?

A

Hardy Schulze rule is related to coagulation

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B

Brownian movement and Tyndall effect are the characteristic of colloids

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C

In gel, the liquid is dispersed in liquid

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D

Lower the gold number, more is the protective power of lyophilic sols

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Solution

The correct option is B In gel, the liquid is dispersed in liquid
In case of a gel, the dispersed phase is liquid and the dispersion is solid.

For example, Cheese, butter, boot polish etc.

Hence, option C is an incorrect statement.

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Similar questions

Q. How many of the following statement(s) are correct?

(A) Hardy Schulz rule is related to coagulation
(B) Brownian motion and Tyndall effect are the characteristics of colloids
(C) In Sol, the liquid is dispersed in a liquid
(D) Lower the gold number more is the protective power of lyophilic sols
(E) All colloidal dispersion give very low osmotic pressure and who very small freezing point depression or boiling point elevation
(F) When negatively charged smoke comes in contact with positively charged clouds rainfall takes place
(G) For a positive sol, flocculation values are in the order:

N a C l > K_{2} S O_{4} > N a_{3} P O > K_{4} [F e (C N)_{6}]

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.

The coagulation of 100 mL of colloidal solution of gold is completely prevented by the addition of 0.25 g of a substance “

X

” to it before the addition of 1 mL of

10 % N a C l

solution. The gold number of “

X

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 :

Q. Which of the following statements are correct?
1. The smaller the gold number of lyophobic colloid, the larger will be its protective power.
2. Lyophilic sols, in contrast to lyophobic sols are easily coagulated on the addition of small amounts of electrolytes.
3. Ferric chloride solution is used to stop bleeding from a fresh cut because it coagulates the blood.
4. The flocculation value of arsenious sulfide sol is independent of the anion of the coagulating electrolyte.

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