Question

a solution is a homogeneous mixture. why?

Answer 1

because the mixture in which the constituent substance cannot be separately seen. so it is a homogeneous mixture.

Answer 2

A solution is a homogenous mixture because 1)The size of particles of a solution is less than 1nm in diameter and they can not be seen by naked eyes.
2)They do not scatter a beam of light passing through the solution. So the path of light is not visible.
3) A solution is stable
So a solution is a homogenous mixture