Which of the following are solutions? Choose all that apply. (Note: do not pick heterogeneous systems that contain a homogeneous phase.)

Question

- Cold coffee or cold tea.
-Cigarette smoke.
- Tap water.
- Milk.
- Fog.
- The air typically found in a room.
- Pure water.

Answer 1

solutions are transparent, homogenous, uniformly mixed.

I see only three listed that are solutions.