(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.