For an ideal solution of two volatile liquids, the relationship between solvent–solvent, solute–solute and solute–solvent intermolecular forces is:
AAll three are comparable in magnitude
BNo intermolecular forces exist in either component
CSolute–solvent ≫ solute–solute, solvent–solvent
DSolute–solvent ≪ solute–solute, solvent–solvent
Answer & Solution
Correct answer: A. All three are comparable in magnitude
Ideal behaviour requires that swapping a solvent neighbour for a solute neighbour costs no extra energy — i.e. all three interaction strengths are comparable. Hence $\Delta_{mix}H = 0$ and Raoult's law holds at every composition.
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