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Chemistry · 2025 · 2 marks
CBSE 2025 · Region 7 · Set 3 · Q17
(a) A and B liquids on mixing show rise in temperature. Which type of deviation from Raoult's law is there and why? (b) Why can azeotropic mixture…
(a)
A and B liquids on mixing show rise in temperature. Which type of deviation from Raoult's law is there and why ?
(b)
Why can azeotropic mixture not be separated by fractional distillation?
Marking-scheme solution
(a)
Negative deviation
Because A-B interactions are stronger than A-A and B-B interactions
(b)
Because of same composition in liquid and vapour phase
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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.