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.
Related questions
The mass of NaOH (M = 40 g/mol) required to prepare 500 mL of a 0.20 M NaOH solution isWhich of these solutions will boil at the highest temperature at 1 atm?The molality of a 1 M aqueous NaCl solution (density = 1.04 g/mL, NaCl M = 58.5 g/mol) is Osmotic pressure π of a dilute solution obeys π = C R T. Here C representsVan't Hoff factor i > 1 for a solute indicatesA negative deviation from Raoult law is expected whenIf a solute dimerises in solution, its observed molar mass compared with the calculated vaWhich of the following is NOT a colligative property?