Question

Which of the following azeotropes is not correctly matched?

• A. $H{NO}_3$(68%)$+H_{2}O$ (32%): Maximum boiling azerotrope, boiling point $=393.5K$
• B. $H_{2}O$(43%)$+HI$ (57%): Minimum boiling azeotrope, boiling point $=290K$
• C. $C_2{H}_5$(95.5%)$+H_{2}O$ (4.5%): Minimum boiling azerotrope, boiling point $=351.15K$
• D. Chloroform (93.2%) $+C_2{H}_{5}OH$ (6.8%): Minimum boiling azeotrope, boiling point$=332.3K$)

Answer 1

Answer: (B)

$H_{2}O$(43%)$+HI$ (57%): Minimum boiling azeotrope, boiling point $=290K$

A minimum boiling azeotrope is a liquid mixture that has a lower boiling point than its individual parts. The boiling point of an azeotrope is constant because the vapour is identical in composition to the liquid mix itself.

$H_{2}O$ (43%) and HI (57%) make maximum boiling azeotropic mixture on boiling at 400 K.