Cloud or fog is a colloidal system in which the dispersed phase and the dispersion medium are:

gas, liquid

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liquid, gas

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liquid, liquid

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solid, solid

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Solution

The correct option is B liquid, gas
When dispersion medium is gas, the dispersed phase can be solid or liquid but not the gas. Colloids of gas with dispersed phase as solids or liquids are called Aerosols. Fog is example of aerosol particle thus cloud or fog is a colloidal system in which the dispersed phase is liquid and the dispersion medium are gas. Thus option B is correct.

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