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Q. In colloidal solution, dispersed phase and dispersion medium may be solid, liquid or gas. In how many of the following, the physical state of the dispersed phase is same as the physical state of the dispersion medium?
Pumice stone, ruby glass, mist, milk, sponge, fog, shaving cream

Surface Chemistry

Solution:

Example Dispersed phase Dispersion medium
Pumice stone Gas Solid
Ruby glass Solid Solid
Mist Liquid Gas
Milk Liquid Liquid
Sponge Gas Solid
Fog Liquid Gas
Shaving cream Gas Liquid