alleryA MINIMUM-BOILING azeotrope arises from:
ANegative deviation from Raoult's law (HNO3-water type)
BPositive deviation from Raoult's law (ethanol-water type)
CIdeal solution behaviour (benzene-toluene type)
DTwo completely immiscible liquids (oil and water)
Answer & Solution
Correct answer: B. Positive deviation from Raoult's law (ethanol-water type)
**POSITIVE deviation from Raoult:** solute-solvent interactions weaker than pure-component
→ MORE vapour → higher vapour pressure
→ LOWER boiling point at certain composition.
Forms minimum-boiling azeotrope.
**Classic:** 95.6% ethanol + 4.4% water at 78.2°C.
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Related questions
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