Question

Position of non polar and polar part in micelle

(a) polar at outer surface but non polar at inner surface

(b) polar at inner surface non polar at outer surface

(c) distributed over all the surface

(d) are present in the surface only

Answer 1

Correct option (a) polar at outer surface but non polar at inner surface

Explanation :

Micelles are the clusters or aggregates formed in solution by association of colloids. Usually such molecules have a lyophobic group

and a iyophilic group. The long hydrocarbon is the lyophobic portion which tries to recede away from the solvent water and the ionisable lyophilic group which tends to go into water resulting into ions. As the concentration is increased the lyophobic parts receding away from the solvent approach each other and form a cluster, the lyophobic ends are in the interior lyophilic groups projecting outward in contact with the solvent.