NEET 2026 (Phase 1) · ChemistryPrevious Year Question
A mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law due to:
- A.Increase in escaping tendency of molecules of each component.
- B.Formation of hydrogen bonding between acetone and chloroform.✓
- C.Stronger intermolecular forces between chloroform molecules than those between chloroform and acetone molecules.
- D.Repulsive forces.
Correct Answer
(B) Formation of hydrogen bonding between acetone and chloroform.
Solution & Explanation
\textbf{Answer:} (B) Formation of hydrogen bonding between acetone and chloroform. \textbf{Solution:} Chloroform (\ce{CHCl3}) and acetone (\ce{(CH3)2CO}) form a solution showing \textbf{negative deviation}. The acidic hydrogen of chloroform forms a new hydrogen bond with the carbonyl oxygen of acetone. This new A-B attraction is stronger than the A-A and B-B interactions, lowering the escaping tendency and hence the vapour pressure below the Raoult's law value → negative deviation.
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