Case: Read the passage and answer the following questions

A colloid is a heterogeneous system in which one substance is dispersed (dispersed phase) as very fine particles in another substance called a dispersion medium. The essential difference between a solution and a colloid is that of particle size. Colloids are classified based on the following criteria: (i) Physical state of the dispersed phase and dispersion medium (ii) Nature of interaction between the dispersed phase and dispersion medium (iii) Type of particles of the dispersed phase.

What is the diameter range of colloidal particles?

1nm to 1000nm

Colloidal particles are larger than simple molecules but small enough to remain suspended. Their range of diameters is between 1 and 1000 nm.