Question

What happens when:

(a) a strong beam of light is passed through a colloidal solution?

(b) an emf is applied across a colloidal solution?

Answer 1

Colloids

They are type of mixtures having 1-1000 nm sized particles dispersed in a medium.

The particles dispersed is called dispersed phase and medium in which particles dispersed is called dispersion medium.

a) when a strong beam of light passed through a colloidal solution, light got scattered by the dispersed particles and path of light become visible, this phenomenon is called Tyndall effect.

b) when an emf is applied across a colloidal solution it moves towards opposite electrodes since colloidal particles carry opposite charge move toward cathode and anode called electrophoresis.