Which phenomenon occurs when an electric field is applied to a colloidal solution and electrophoresis is prevented? (i) Reverse osmosis takes place. (ii) Electroosmosis takes place. (iii) Dispersion medium begins to move. (iv) Dispersion medium becomes stationary.
Option 2&3) When electrophoresis, i.e, movement of particles is prevented by some suitable means, it is observed that the dispersion medium begins to move in an electric field. This phenomenon is termed electroosmosis.
