Question

The size of solute particles in a colloid is between -------- and --------- m.

• A. ${10}^{-9}$
• B. ${10}^{-7}$

Answer 1

1. A colloid is a type of mixture in which the size of solute particles is intermediate to that of true solution and suspension.
2. A colloidal solution has two phases: dispersed phase (like solute) and dispersion medium (like solvent).
3. The dispersed phase is the compound which is present in small proportion and consists of particles of colloidal dimensions (${10}^{-9}\mathrm{m}\mathrm{to}{10}^{-7}\mathrm{m}$).
4. A dispersion medium is a component which is present in excess and acts as a medium in which colloidal particles are dispersed.
5. Examples - milk, gold sol, etc.

Hence, the size of solute particles in a colloid varies between ${10}^{-9}$and ${10}^{-7}\mathrm{m}$.