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For a pair of liquids A and B that behave as an ideal solution, which statement is true?

1. The entropy change on mixing is zero.
2. The Gibbs free energy change on mixing is zero.
3. Both the Gibbs free energy change and the entropy change on mixing are zero.
4. The enthalpy change on mixing is zero.

Correct answer: The enthalpy change on mixing is zero.

Solution

In an ideal solution, the enthalpy change upon mixing is zero because the interactions between the molecules of the different components are similar to those between the molecules of the same component, leading to no net energy change.

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