6. The system that forms maximum boiling azeotrope is

a. Carbondisulphide – acetone

b. Benzene – toluene

c. Acetone – chloroform

d. n- hexane – n- heptane

e. Ethanol – acetone

Ans. c

Explanation : Acetone and chloroform form hydrogen bonds between he molecules of each other so in this solution adhesived forces are stronger than cohesive forces. As a result it show negative deviation from Raoult’s law so there is an intermediate composition for which the vapour pressure of the solution is minimum, and hence boiling point is maximum

Hence the system forms maximum boiling azeotrope mixture.