JEE · NEET Previous Year Question
The mixture which shows positive deviation from Raoult's law is:
Topic: NEET PYQ
Answer: D. Full step-by-step solution below.
- ABenzene + Toluene
- BAcetone + Chloroform
- CChloroethane + Bromoethane
- DEthanol + Acetone
Correct answer: D
Solution
(d) Ethanol-acetone mixture shows positive deviation due to weaker interaction incomparison to or interaction. Pure ethanol molecules are hydrogen bonded. When acetone is added, its molecules get in between the ethanol molecules and break some of the hydrogen bonds between them. Thus, the intermolecular attractive interactions are weakens and the solution shows positive deviation from Raoult's law.
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