Question

Compared to a true solution, which of the following is true for a colloidal system/dispersion?

• A. Colloidal dispersions have significantly fewer particles
• B. Colloidal dispersions have significantly more particles
• C. Both true solutions and colloidal dispersions have similar number of particles
• D. None of the above

Answer 1

The correct option is A Colloidal dispersions have significantly fewer particles

The dispersed phase of a Colloidal dispersion are not just simple molecules but are physical aggregations of molecules. So for a given mass of sol, the number of particles will be significantly smaller when compared to the number of particles in a similar sample of true solution.
Colligative properties ∝ Number of particles