The mixture that forms maximum boiling azeotrope is (1) Water + Nitric acid. (2) Ethanol + Water.

Question : The mixture that forms maximum boiling azeotrope is

(1) Water + Nitric acid.

(2) Ethanol + Water.

(3) Acetone + Carbon disulphide.

(4) Heptane + Octane.

Answer : from all above options the correct answer is “(1) Water + Nitric acid. ” keep in mind that A mixture of nitric acid and water exist as an azeotrope of composition nitric acid (68%) + water (32%) by mass. It is a maximum boiling (negative deviation) azeotrope. These solutions will boil at a higher boiling point than any of its pure components.
Answer (1)

other details : first of all you must know about azeotrope , an azeotrope is liquid mixture that contains some constant boiling point and when this mixture is vaporized than the composition of it will be same as liquid. Water + Nitric acid , in comparison to other options contains the highest boiling point that is why we have marked this option as correct answer.