Smoke - We must know that smoke is a term used for one of the products of a fire. It is actually a collection of particles that are less than five microns in diameter and stay suspended in the air. That is why smoke is a heterogeneous mixture.

Why is smoke a heterogeneous mixture?

Also, there are no energy changes involved when a mixture is made. ... We know that smoke is a heterogeneous mixture of solids in a fluid /gaseous medium. Thus, we can say that smoke is a mixture with solid particles in the dispersed phase and gas as the dispersed medium. Therefore, the correct option is C.

Is smoke a homogeneous mixture if not then what is it?

No, the smoke is not a homogeneous solution. ... It is a heterogeneous solution as it does not have uniform composition throughout.