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Question:

How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?

Answer:

One criterion for classifying colloids is the physical state of the dispersed phase and dispersion medium. Depending upon the type of the dispersed phase and dispersion medium (solid, liquid, or gas), there can be eight types of colloidal systems.

Dispersed phase Dispersion medium Type of colloid Example

1.

Solid

 Solid Solid Sol Gemstone

2.

Solid

 Liquid Sol Paint

3.

Solid

 Gas Aerosol Smoke

4.

Liquid

 Solid Gel Cheese

5.

Liquid

 Liquid Emulsion Milk

6.

Liquid

 Gas Aerosol Fog

7.

Gas

 Solid Solid foam Pumice stone

8.

Gas

 Liquid Foam Froth

 


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