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Which of the following statements about ideal and non-ideal solutions is **incorrect**?
AIdeal solutions obey Raoult's law over the entire range of concentrations.
BFor non-ideal solutions, vapour pressure can be higher or lower than predicted by Raoult.
C$\Delta_{mix}V \neq 0$ for an ideal solution.
DA benzene + toluene mixture behaves nearly ideally.
Answer & Solution
Correct answer: C. $\Delta_{mix}V \neq 0$ for an ideal solution.
For an ideal solution $\Delta_{mix}V = 0$ (and $\Delta_{mix}H = 0$). Statement C inverts this — so it is the incorrect statement. The other three are textbook-true.
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