(i) Reverse osmosis takes place.
(ii) Electro osmosis takes place.
(iii) Dispersion medium begins to move.
(iv) Dispersion medium becomes stationary.
Correct Answers:
(ii) Electro osmosis takes place.
(iii) Dispersion medium begins to move.
Explanation: Electro osmosis takes place and the dispersion medium begins to move when an electric field is applied to a colloidal solution and electrophoresis is prevented.