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For an ideal solution, the enthalpy of mixing and the volume of mixing of the pure components are respectively:
Anegative and positive
Bzero and zero
Czero and negative
Dpositive and zero
Answer & Solution
Correct answer: B. zero and zero
1. An ideal solution obeys Raoult's law over the entire concentration range.
2. For such solutions $\Delta_{mix}H = 0$ (no heat absorbed or evolved).
3. Also $\Delta_{mix}V = 0$ (volume is additive). Hence both are zero.
_Source: NCERT Class 12 Chemistry Ch 1 "Solutions", p.12_
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