Question

how to know wather a solution is collodial or suspension or just solution

Answer 1

A solution is always transparent, light passes through with no scattering from solute particles which are molecule in size. The solution is homogeneous and does not settle out. A solution cannot be filtered but can be separated using the process of distillation.

A suspension is cloudy and heterogeneous. The particles are larger than 10,000 Angstroms which allows them to be filtered. If a suspension is allowed to stand the particles will separate out.

A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid
will not.