The correct statement(s) among the following is ?

(I) The values of Vant-Hoff factor(i) at Various concentrations for $K_{2}S{O}_4$  (incomplete dissociation) increases with

dilution as, 2.32 at 0.1m, 2.70 at 0.01 m, 2.84 at 0.001m but it will be less than 3

(II) 0.155 M NaCl solution is isotonic with the fluid inside the blood cell

(III) Celluose acetate placed over a suitable support is used as a semi – permaeable membrane in reverse osmosis as it can bare quite high pressure which is required for reverse osmosis

 (IV) Osmotic pressure method is used to determine molar masses of proteins, polymers and other macromolecules