Question

In the colloidal state, the particle size ranges:
A. below 1 nm
B. between 1 nm to 100 nm
C. more than 100 nm
D. none of the above

Answer 1

Hint: An ordinary solution is composed of solvent and solute. The particles of solute in an ordinary solution are usually either normal molecules or ions.

Complete answer:
There are various systems, where the particles are considerably larger and may in fact range from upper limit for ordinary solutions up to several micrometres in size.
Systems which consist of dissolved or dispersed particles ranging approximately between 1 to 1000 nm are called colloids. Colloidal particles are smaller in size, and cannot be normally seen with naked eye. The particles of colloids can be easily passed through normal filter paper.
A colloidal system consist of two phases,
The phase which is dispersed or scattered through the dispersion medium is called Dispersed phase or discontinues phase. The phase in which the scattering is done is called the dispersion medium or continuous medium.
Each of the two phases constituting a colloidal system may be a gas, a liquid or a solid. In milk, for example, the fat globules are dispersed in water. Hence fat globules form a dispersed phase and water is the dispersed medium.
So from the above discussion we can conclude that in case of colloids particle size ranges from 1 nm to 1000 nm.

Hence the correct option is option D.

Note: Colloids could be of the type sol, solid sol, gel, emulsion and foam with different dispersed phase and medium.