Medium MCQ +4 / -1 PYQ · JEE Mains 2025

Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?

  1. A <p>$\text{CH}_3\text{OH} + \text{CHCl}_3$</p>
  2. B <p>$\text{C}_6\text{H}_5\text{OH} + \text{C}_6\text{H}_5\text{NH}_2$</p> Correct answer
  3. C <p>$\text{H}_2\text{O} + \text{CH}_3\text{COC}_2\text{H}_5$</p>
  4. D <p>$\text{CS}_2 + \text{CH}_3\text{COCH}_3$</p>

Solution

<p>A binary mixture of $ \text{C}_6\text{H}_5\text{OH} $ and $ \text{C}_6\text{H}_5\text{NH}_2 $ exhibits negative deviation from Raoult's law. This means that the vapor pressure of the solution is lower than the vapor pressures of the pure components, $ \text{C}_6\text{H}_5\text{OH} $ and $ \text{C}_6\text{H}_5\text{NH}_2 $. Consequently, the boiling point of the solution is higher than the boiling points of the pure substances. Therefore, this mixture forms a maximum boiling azeotrope.</p>

About this question

Subject: Chemistry · Chapter: States of Matter · Topic: Gas Laws

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