Question

Which of the following is not a colloidal solution ?

Answer 1

Colloids are classified into many types based on many aspects.
On basis of physical state of dispersed phase and dispersion medium, colloids are classified into 8 types:


Mixture of a gas with another gas is not a colloidal system because it forms a homogeneous system. But the colloidal solution is a heterogeneous system. Hence, gas-gas is not a colloidal solution. ​