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Match each solution pair in List-I with the correct properties from List-II. List-I: (P) Benzene + toluene, (Q) Benzene + acetic acid (dilute), (R) Water + nitric acid, (S) Chloroform + acetone. List-II: (1) Follows Raoult's law, (2) Deviates from Raoult's law, (3) Can be separated by fractional distillation, (4) Forms a maximum-boiling azeotrope, (5) Solute undergoes association.
- P -> 1,3,4,5; Q -> 2,4; R -> 2,4; S -> 1,3,5
- P -> 1,3; Q -> 1,2,5; R -> 2,4; S -> 2,3,4,5
- P -> 1,2; Q -> 1,5; R -> 2,4; S -> 2,4,5
- P -> 1,3; Q -> 1,5; R -> 2,4; S -> 2,4
Correct answer: P -> 1,3; Q -> 1,5; R -> 2,4; S -> 2,4
Solution
P (Benzene+Toluene): Similar structure, ideal solution — follows Raoult's law (1) and can be separated by fractional distillation (3). Q (Benzene+Acetic acid): Acetic acid associates (dimerises) in organic solvent — solute shows association (5); the mixture still approximately follows Raoult's law with effective lower concentration (1). R (Water+Nitric acid): Strong interactions, large negative deviation from Raoult's law (2), forms maximum-boiling azeotrope at ~68% HNO3 (4). S (Chloroform+Acetone): H-bonding between CHCl3 and acetone causes negative deviation (2), forms maximum-boiling azeotrope (4). Answer: D.
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