JEE Main Chemistry question

A binary liquid solution is prepared by mixing -heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution? [AIEEE 2009]

(A)The solution formed is an ideal solution
(B)The solution is non-ideal, showing positive deviation from Raoult's lawCorrect
(C)The solution is non-ideal, showing negative deviation from Raoult's law
(D)-heptane shows positive deviation while ethanol shows negative deviation from Raoult's law

Answer: (B)

Solution

In pure ethanol, molecules are extensively hydrogen-bonded. Adding non-polar -heptane inserts itself between ethanol molecules and breaks some of these hydrogen bonds, weakening the net intermolecular attractions

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Question ID VK-142982