Which of the following statement is not true about suspension ?

Question

$\begin{array}{1 1} \text{a. The particles of suspension can be separated from solvent by the process of filtration.}\\ \text{b When the suspension is kept undisturbed the particles of suspension settle down.} \\ \text{ c. A suspension is homogeneous in nature.} \\ \text{d.Scattering of light take place in suspension. } \end{array}$