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Question

Which of the following azeotropes is not correctly matched?

A
HNO3(68%)+H2O (32%): Maximum boiling azerotrope, boiling point =393.5K
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B
H2O(43%)+HI (57%): Minimum boiling azeotrope, boiling point =290K
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C
C2H5(95.5%)+H2O (4.5%): Minimum boiling azerotrope, boiling point =351.15K
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D
Chloroform (93.2%) +C2H5OH (6.8%): Minimum boiling azeotrope, boiling point=332.3K)
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Solution

The correct option is A H2O(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.

H2O (43%) and HI (57%) make maximum boiling azeotropic mixture on boiling at 400 K.

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