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Standard X
Physics
Classification of Colloids - Based on Nature of Interaction
Colloidal dis...
Question

Colloidal dispersions can be classified based on the nature of interaction as – Lyophilic or Lyophobic. Which of the two is readily obtained by shaking or warming a substance with a suitable solvent or dispersion medium?

A
Lyophilic colloids
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B
Lyophobic colloids
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C
Both A and B are possible
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D
Neither A nor B.
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Solution

The correct option is A Lyophilic colloids
When we get a colloidal system readily by warming or shaking the substance with a suitable solvent, it is called as lyophilic colloid. The term ‘lyo’ means ‘solvent’ while the term ‘philic’ implies ‘to love’. So these colloids are solvent-loving. For example, gelatin, starch, proteins, gum and rubber sols. On the other hand, lyophobic sols are solvent-hating as the term ‘phobic’ means ‘to hate’. They are not easily obtained. Examples include gold sols, Sulphur sol, As2S3 sol and a sol of Fe(OH)3.

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Q. Assertion :Proteins, starch and rubber are lyophilic colloids. Reason: They have strong interaction with the dispersion medium.
Q.

How are colloids classified on the basis of

Physical states of components

Nature of dispersed phase and

Interaction between dispersed phase and dispersion medium ?

Q. A colloidal system having a solid substance as a dispersed phase and a liquid as a dispersion medium are classified as:
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.

[AgI]I− colloidal sol can be coagulated by the addition of a suitable cation. 1 mol [AgI]I− requires AgNO3, Pb(NO3)2 & Fe(NO3)3 as (in moles):
Q.

Dispersion medium in a colloid can only be a liquid or gas.


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