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Methods to Form Lyophobic Colloids

Examples of l...

Question

Examples of lyophobic colloids are :

A

RBC

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B

metalsulphide sols

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C

smoke

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D

albumin

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Solution

The correct option is D metalsulphide sols
Lyophobic colloids are liquid hating colloids (Lyo means solvent and phobic means hating). When these colloids are mixed with the suitable liquid, a very weak force of attraction exists between colloidal particles and liquid and system does not pass into colloidal state readily.

e.g. Metal Sulphide sols

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Q. What are the characteristics of the following colloids? Give one example of each
(i) Multimolecular colloids (ii) Lyophobic sols (iii) Emulsions

Q. What are lyophilic and lyophobic colloids? Which of these sols can be easily coagulated on addition of small amounts of electrolytes?

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. What are lyophilic and lyophobic sols? Give one example of each.

Q. What are lyophilic and lyophobic sols? Give one example of each type. Why are hydrophobic sols easily coagulated?

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