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Catalysis

A lyophilic s...

Question

A lyophilic sol is at its isoelectric point then it is:

A

negatively charged

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B

positively charged

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C

not charged

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D

none of these

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Solution

The correct option is D not charged
In a lyophilic sol, the hydrogen ion concentration at which the colloidal particles are neither positively charged nor negatively charged (i.e. uncharged) is known as the isoelectric point of the colloid. At this point, the lyophilic colloid is expected to have minimum stability because at this point particles have no charge.

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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.

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

Q. When negatively charged colloid like

A s_{2} S_{3}

sol is added to positively charged

F e {(O H)}_{3}

sol in suitable amounts, then :

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. What happens when a lyophilic sol is added to a lyophobic sol?

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