🏫 Board🧪 Chemistry

Identify the mixture that shows positive deviations from Raoult's Law

Q1 FREE PREVIEW

Identify the mixture that shows positive deviations from Raoult's Law

a

CHCl3 + (CH3)2CO

b

(CH3)2CO + C6H5NH2

c

(CH3)2CO + CS2

d

CHCl3 + C6H6

✓ Correct answer: c)

(CH3)2CO + CS2

Explanation

Mixing polar acetone with non-polar CS₂ weakens intermolecular attractions (A–B < A–A/B–B) → positive deviation from Raoult’s law.
The other pairs (acetone–chloroform, acetone–aniline, chloroform–benzene) form specific associations/H-bonding → negative deviation.

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