NEET Chemistry Surface Chemistry Questions Solved

BOARD

What are the characteristics of the following colloids? Give one example 

of each.

(i) Multimolecular colloids

(ii) Lyophobic sols 

(iii) Emulsions

(i) Multimolecular colloids:

1. They are formed by the aggregation of a large number of atoms

or molecules which generally have diameter less than 1 nm,

Example: sols of gold, sulphur etc.

2. Their molecular masses are not very high.

3. Their atoms or molecules are held together by weak Van der Waal's forces.

(ii) Lyophobic sols: Liquid hating colloids in which their is no affinity between 

disperse phase and dispersion medium.

Example: As2S3 sol. Fe(OH)3 sol.

(iii) Emulsions: The colloidal solution in which both dispersed phase and dispersion

medium are in liquid state.

Example: Milk, Cream.

Difficulty Level:

  • 88%
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