Which among the following is a colloidal system with solid as the dispersed phase and gas as the dispersion medium?

fog

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cloud

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air

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smoke

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Solution

The correct option is D smoke
A colloid is a heterogeneous mixture in which the particles of the dispersed phase are distributed non-uniformly in the dispersion medium.

In smoke, solid particles (dispersed phase) like ash, dust, etc. are dispersed in air (dispersion medium). Hence, it is a colloid with solid as the dispersed phase and gas as the dispersion medium.

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