Which of the following pairs of liquids is expected to form a nearly ideal solution?

Aacetone and chloroform
Bn-hexane and n-heptane
Cnitric acid and water
Dethanol and cyclohexane

Answer: B

Ideal behaviour needs A-B interactions similar to A-A and B-B interactions, with

Δ_{mix} H \approx 0

and

Δ_{mix} V \approx 0

. n-Hexane and n-heptane are chemically very similar non-polar liquids, so they fit. Acetone-chloroform (hydrogen bonding) and nitric acid-water show negative deviation, ethanol-cyclohexane shows positive deviation.

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