JEE Advanced · 2016 · 22 May 2016 · Paper 2 · Solutions

Mixture(s) showing positive deviation from Raoult's law at 35 °C is(are)

(A)carbon tetrachloride + methanol✓ Correct
(B)carbon disulphide + acetone✓ Correct
(C)benzene + toluene
(D)phenol + aniline

Answer: (A), (B)

Solution

Positive deviation occurs when intermolecular forces in the mixture are weaker than in pure components. Carbon tetrachloride + methanol shows positive deviation (non-polar + polar with H-bonding disrupted). Carbon disulphide + acetone shows positive deviation. Benzene + toluene form an ideal solution (similar structures). Phenol + aniline show negative deviation (strong H-bonding in mixture).

JEE Advanced · 2016 · 22 May 2016 · Paper 2 · One or more correct options

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