Lyophilic sols are :

irreversible sols

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prepared from inorganic compounds

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self stabilizing

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not coagulated by adding electrolyte

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Solution

The correct option is C self stabilizing
Lyophilic or solvent loving : When dispersed phase has a greater affinity for the dispersion medium, the colloids are termed as lyophilic and when the dispersion medium is water, they are given the name hydrophilic. They are also called natural colloids. Substances like proteins, starch and rubber etc. are grouped under this category.

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Similar questions

Which of the following is/are correct ?
i) lyophobic sols are less stable
ii) lyophilic sols are reversible
iii) lyophobic sols are coagulated by adding electrolytes
iv) lyophobic sols are more hydrated

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

Q. Lyophilic sols could be coagulated by

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^{-}

requires

A g N O_{3}, P b (N O_{3})_{2}

F e (N O_{3})_{3}

as (in moles):

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

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