$(a)$ Both smoke and fog are aerosols. In what way are they different?
$(b)$ How do sol and gel differ from each other? Give one example for each.

(N/A) Smoke and fog differ in their dispersed phase. In smoke,the dispersed phase is solid,and in fog,the dispersed phase is liquid,while the dispersion medium is gas in both cases.
$(b)$ Sol: The dispersed phase is solid and the dispersion medium is liquid. Example: Mud.
Gel: The dispersed phase is liquid and the dispersion medium is solid. Example: Butter or cheese.