Answer:
A mixture that scatters light is colloid
Step-by-step explanation:
There are three categories of defining dissolution of a solute in a solvent:
a) true solution: where particle size is less than 1 nm
b) colloidal solutions: Where particles size is in between 1 - 1000 nm
c) suspension : where particle size is more than 1000 nm.
True solutions are homogeneous mixtures while colloids and suspensions are heterogeneous.
The mixture that settles out on standing is suspension. Example : sand in water.
A mixture that separated by filtration (normal filter paper) is again a suspension.
A mixture that scatters light is colloid. Colloids show tyndall effect.
A salt and water mixture is a true solution, which cannot be separated by filter paper or semi permeable membrane even.