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Smoke is what type of mixture?

Answer and explanation

Correct answer: Colloid

The direct answer is B: smoke is a colloid. Smoke is made when very small solid particles, such as soot or ash, are dispersed throughout a gas, usually air. In colloids, the dispersed particles are larger than ordinary molecules but small enough to remain spread through the medium for a considerable time. Smoke can scatter light, which is a familiar colloidal behaviour. Option B is correct because its dispersed phase is solid and its dispersion medium is gas. Option A is wrong: smoke is not a pure gas because it contains solid particles. Option C is wrong: it is not a pure element because smoke is a combination of different substances. Option D is wrong: it is not a pure metal, and its particles may contain several materials. Do not confuse a colloid with a true solution or a coarse suspension; school-level classification identifies smoke as a solid-in-gas colloid. Memory cue: smoke = solid particles floating in gas.

Related tags

SmokeColloidDispersed Particles

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