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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 7 · Set 1 · Q17
What is meant by positive deviation from Raoult's law? Give an example. What type of azeotrope is formed by positive deviation?
What is meant by positive deviation from Raoult's law ? Give an example. What type of azeotrope is formed by positive deviation ?
Marking-scheme solution
When vapour pressure of the solution is higher than expected from the ideal
behaviour.
Example : ethanol and acetone/ carbon disulphide and acetone
Minimum boiling azeotrope
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.