Which of the following particles do not remain suspended when dissolved in water?
Based on the particle size, heterogeneous mixtures can be classified into:
1. Colloidal solution: Particle size between 1-1000 nm
2. Suspension: Particle size greater than 1000 nm
Flour, Chalk powder, Sand will form suspension due to their large particle size.
The particle size of sugar in the solution is less than 1 nm and thus forms a true solution.