Solutions Question 305

Question: Which will form maximum boiling point azeotrope-

Options:

A) $ HNO_3+H_2O $ solution

B) $ C_2H_5OH+H_2O $ solution

C) $ C_6H_6+C_6H_5CH_3 $ solution

D) None of these

Show Answer

Answer:

Correct Answer: A

Solution:

The solutions (liquid mixture) which boils at constant temperature and can distil as such without any change in composition are called azeotropes. Solution of $ HNO_3 $ and $ H_2O $ will form maximum boiling point azeotrope. Maximum boiling azeotropes show negative deviation from Raoult’s law.

Composition (%) Boiling Point
$ HNO_3 $ 68.0 359 K
$ H_2O $ 32.0 373 K

Boiling point of the azeotrope of these two solutions is 393.5 K.



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