Question:
An azeotropic solution of two liquids has a boiling point lower than either of them when it:
An azeotropic solution of two liquids has a boiling point lower than either of them when it:
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A positive deviation from Raoult’s Law means that intermolecular forces in the mixture are weaker than in the pure components.
Updated On: Feb 25, 2025
- is saturated
- shows positive deviation from Raoult’s law
- shows negative deviation from Raoult’s law
- shows no deviation from Raoult’s law
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The Correct Option is B
Solution and Explanation
An azeotropic mixture that has a boiling point lower than its components is called a minimum boiling azeotrope. This occurs when:
- The intermolecular forces between different components are weaker than those in the pure liquids.
- This results in a higher vapor pressure and, consequently, a lower boiling point than either of the individual components.
- It occurs when the mixture exhibits a positive deviation from Raoult’s Law.
Example: Ethanol-Water mixture (boiling point 78.2°C) boils at a lower temperature than pure ethanol or pure water.
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