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Chemistry · 2023 · 2 marks
CBSE 2023 · Region 3 · Set 3 · Q22
What type of deviation from Raoult's law is shown by a mixture of ethanol and acetone? Give reason.
What type of deviation from Raoult's law is shown by a mixture of ethanol and acetone? Give reason.
Marking-scheme solution
Positive deviation Because the addition of acetone breaks the H-bond of ethanol resulting in increase in vapour pressure / interaction between ethanol-acetone is weaker than ethanolethanol 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.