(A) colloid is a heterogeneous system in which one substance is dispersed as very fine particles in another substance called the dispersion medium.Smo

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(A) colloid is a heterogeneous system in which one substance is dispersed as very fine particles in another substance called the dispersion medium.Smoke is an example of a colloid where solid particles (like carbon) are dispersed in a gas (like air).Therefore,it is a solid dispersed in a gas.