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Match the following liquid pairs in Column-I with their thermodynamic mixing properties in Column-II. Column-I: (A) Acetone + Chloroform (B) Ethanol + Water (C) Ethyl bromide + Ethyl iodide (D) Acetone + Benzene Column-II: (P) delta_S_mix > 0 (Q) delta_V_mix > 0 (R) delta_H_mix < 0 (S) Maximum boiling azeotrope (T) Minimum boiling azeotrope Which set of properties correctly matches pair (A)?
- P, R, S
- Q, R, T
- P, Q, T
- P, Q, R
Correct answer: P, R, S
Solution
Acetone + CHCl3 interact via hydrogen bonding (CHCl3 H with O of acetone), which is stronger than acetone-acetone or CHCl3-CHCl3 interactions. This leads to negative deviation from Raoult's law: delta_H_mix < 0, vapour pressure lower than ideal, and a maximum boiling azeotrope. delta_S_mix is always > 0 on mixing (disorder increases). So for (A): P, R, S.
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