A) shows a positive deviation from Raoult's law
B) behaves like a non ideal solution
C) obeys Raoult's law
D) shows a negative deviation from Raoult's law
Correct Answer: A
Solution :
[a] A solution of acetone in ethanol shows positive deviation from Raoult's law. It is because ethanol molecules are strongly hydrogen bonded. When acetone is added, these molecules break the hydrogen bonds and ethanol becomes more volatile. Therefore its vapour pressure is increased.
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