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Chemistry · 2023 · 2 marks
CBSE 2023 · Region 4 · Set 1 · Q20
(a) What type of deviation from Raoult's law is shown by a mixture of ethanol and acetone? Give reason.
(a)
What type of deviation from Raoult's law is shown by a mixture of ethanol and acetone? Give reason.
OR
(b)
Define Azeotrope. What type of azeotrope is formed by negative deviation from Raoult's law ? Give an example.
Marking-scheme solution
(a)
Positive deviation,
On adding acetone, some of the hydrogen bonds of ethanol are broken down causing an increase in vapour pressure / the ethanol-acetone shows weaker interactions than pure ethanol-ethanol and acetone-acetone interactions.
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.