Question

The system that forms maximum boiling azeotrope is

• A. Carbon disulphide - Acetone
• B. Benzene - Toluene
• C. Acetone - Chloroform
• D. n-hexane - n-heptane

Answer 1

The correct option is C

Acetone - Chloroform

Explanation for correct option

(C) Acetone - Chloroform

Azeotrope

• An azeotrope is a mixture of liquids that shows the same concentration in the vapor phase and the liquid phase.

Raoult's law

• From Raoult's law, if the solution shows negative deviation, for one intermediate composition, the vapor pressure is the lowest, and the boiling is the highest.
• In other words, The liquid mixture of solution that shows negative deviation from the ideal solution boils at a constant temperature higher than the pure component is known as maximum boiling azeotropes.

Here in Acetone - Chloroform mixture

• It is a non-ideal solution.
• it has a negative deviation due to hydrogen bonding between chloroform and acetone.

• Due to negative deviation from Raoult's law, It is a maximum boiling azeotrope.

Hence, Option (C) Acetone - Chloroform is correct.

Explanation for incorrect option

(A) Carbon disulphide - Acetone

• It is a non-ideal solution.
• It has a positive deviation, it does not have any hydrogen bonding.
• It is a minimum boiling azeotrope.

(B) Benzene - Toluene

• It is an ideal solution.
• It does not show any deviation.

(D) n-hexane - n-heptane

• It is an ideal solution.
• It does not show any deviation.

Therefore, Option (C) Acetone - Chloroform is correct.