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NEET 2019 · ChemistryPrevious Year Question

The mixture that forms a maximum boiling azeotrope is:

Answer: (A) Water + Nitric acid. \textbf{Answer:} (A) Water + Nitric acid \textbf{Solution:} A maximum boiling azeotrope is formed by solutions that show \textbf{negative deviation} from Raoult's law (strong A-B intermolecular attraction lowers vapour pressure, raising the boiling point).

  1. A.Water + Nitric acid✓
  2. B.Ethanol + Water
  3. C.Acetone + Carbon disulphide
  4. D.Heptane + Octane

Correct Answer

(A) Water + Nitric acid

Solution & Explanation

\textbf{Answer:} (A) Water + Nitric acid \textbf{Solution:} A maximum boiling azeotrope is formed by solutions that show \textbf{negative deviation} from Raoult's law (strong A-B intermolecular attraction lowers vapour pressure, raising the boiling point). Water + Nitric acid () show negative deviation, giving a maximum boiling azeotrope. Ethanol + Water and Acetone + Carbon disulphide () show positive deviation (minimum boiling azeotropes). Heptane + Octane behave nearly ideally.

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