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What is meant by negative deviation from Raoult’s law? Give an example. What type of azeotrope is formed by negative deviation?
What is meant by negative deviation from Raoult’s law? Give an example. What type of azeotrope is formed by negative deviation?
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Stronger interactions → negative deviation → max boiling azeotrope.
Updated On: Jan 14, 2026
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Solution and Explanation
When a solution's observed vapor pressure is less than predicted by Raoult's law, it signifies a negative deviation. This phenomenon arises from intermolecular attractions between components A and B being stronger than those within A–A or B–B interactions. A common example is a mixture of acetone and chloroform. These types of mixtures are known to form maximum boiling azeotropes.
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