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Question:

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behavior of the solution?

The solution is non-ideal, showing positive deviation from Raoult's Law.

The solution is non-ideal, showing negative deviation from Raoult's Law.

n-heptane shows positive deviation while ethanol shows negative deviation from Raoult's Law.

The solution formed is an ideal solution.

Solution:

On mixing n-heptane and ethanol; strong interactions (ethanol H-bonding) are replaced by weak interactions. Hence, it is a non-ideal solution with positive deviation. Hence option A is correct.