Select the correct statements :
- (i) gold and As2S3 solution are multimolecular colloids and hydrophobic sols.
- (ii) cleansing action of soap is due to adsorption of oily, dirt and greasy material at hydrophobic centres of soap
(iii) hydrophobic part of soap penetrates in oil and hydrophilic part in water to impart stability to emulsion
(iv) hydrophobic solution show more brighter tyndall light than hydrophilic solution
(v) conductance of soap solution changes sharply at CMC
a. (ii), (iii), (iv) and (v) only
b. (i), (ii), (iii) and (iv) only
c. (i), (ii), (iii) and (v) only
d. all of these