Answer:
1 and 2
Step-by-step explanation:
Heterogeneous mixtures are basically refers to any solution that is not uniform in composition. A typical example is a solution of water and sand.
1)
By nature, they settle out. The denser component of the solution falls down and the lighter component stays up.
2)
The proportions may vary as it is a mixture. There is no fixed ratio of solute t solvent.
3)
The solute is not evenly distributed and this is why it is referred to as a non uniform mixture.
4)
They do not necessarily contain teo solvent and two solutes.
The correct options are option 1 and option 2 only.