1. Δ U_mix=0 2. Δ P = P_obs - P_(calculated\ by\ Raoult's\ law) = 0 3. Δ G_mix=0 4. Δ H_mix=0

Answer: 3. Δ G_mix=0 Key idea: an ideal solution has no net interaction change on mixing, and mixing is spontaneous. Δ H_mix=0 and Δ U_mix=0 (A-B forces equal A-A and B-B forces). Δ V_mix=0 and the vapour pressure obeys Raoult's law, so Δ P=0 . Δ S_mix>0 , so Δ G_mix=Δ H-TΔ S<0 , not zero. Hence the incorrect statement is Δ G_mix=0 .

Topic: Ideal and non-ideal solutions· Solutions

Which one of the following is incorrect for ideal solution?

1. \(\Delta U_{mix}=0\)

2. \(\Delta P = P_{obs} - P_{calculated\ by\ Raoult's\ law} = 0\)

3. \(\Delta G_{mix}=0\)

4. \(\Delta H_{mix}=0\)

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Answer: 3. \(\Delta G_{mix}=0\)

Key idea: an ideal solution has no net interaction change on mixing, and mixing is spontaneous.

\(\Delta H_{mix}=0\) and \(\Delta U_{mix}=0\) (A-B forces equal A-A and B-B forces).
\(\Delta V_{mix}=0\) and the vapour pressure obeys Raoult's law, so \(\Delta P=0\).
\(\Delta S_{mix}>0\), so \(\Delta G_{mix}=\Delta H-T\Delta S<0\), not zero.

Hence the incorrect statement is \(\Delta G_{mix}=0\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which one of the following is incorrect for ideal solution?

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