Q5 / 180 · COMEDK 2024 (Afternoon Shift) · Chemistry
The system that forms minimum boiling azeotrope is :
- Correct answerAEthyl alcohol - Water
- BAcetone-Chloroform
- CNitric Acid - Water
- DPhenol-Aniline
Solution
Azeotropes are constant boiling mixtures that distill without change in composition. They are classified into two types based on their deviation from Raoult's Law.
Minimum boiling azeotropes are formed by solutions showing large positive deviations from Raoult's Law. In such cases, the vapor pressure of the solution is higher than the vapor pressure of the individual components, leading to a boiling point lower than that of either component.
Ethyl alcohol and water form a mixture that exhibits a large positive deviation from Raoult's Law. This mixture boils at a temperature lower than the boiling points of both pure ethanol ($78.3^{\circ}C$) and pure water ($100^{\circ}C$), specifically at approximately $78.17^{\circ}C$ for a composition of about $95\%$ ethanol by volume.
Acetone-Chloroform and Nitric Acid-Water exhibit negative deviations from Raoult's Law, forming maximum boiling azeotropes. Phenol-Aniline does not form an azeotrope under standard conditions.
Answer: Ethyl alcohol - Water
Minimum boiling azeotropes are formed by solutions showing large positive deviations from Raoult's Law. In such cases, the vapor pressure of the solution is higher than the vapor pressure of the individual components, leading to a boiling point lower than that of either component.
Ethyl alcohol and water form a mixture that exhibits a large positive deviation from Raoult's Law. This mixture boils at a temperature lower than the boiling points of both pure ethanol ($78.3^{\circ}C$) and pure water ($100^{\circ}C$), specifically at approximately $78.17^{\circ}C$ for a composition of about $95\%$ ethanol by volume.
Acetone-Chloroform and Nitric Acid-Water exhibit negative deviations from Raoult's Law, forming maximum boiling azeotropes. Phenol-Aniline does not form an azeotrope under standard conditions.
Answer: Ethyl alcohol - Water
Hence, the correct answer is option: 'A'.