NEET · Chemistry · STD 12 -1. Solution and colligative properties
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.
Answer & Solution
Correct Answer
(B) formation of hydrogen bonding between acetone and chloroform.
Step-by-step Solution
Detailed explanation
(B) Chloroform Chloroform \(\left( CHCl _3\right)\) and acetone \(\left( CH _3 COCH _3\right)\) form a non-ideal solution showing a negative deviation from Raoult's law.
This is because the hydrogen atom of chloroform forms a hydrogen bond with the oxygen atom of acetone.
The formation of this intermolecular hydrogen bond makes the attractive forces between the unlike molecules stronger than the attractive forces between the like molecules.
As a result, the escaping tendency of the molecules from the liquid phase decreases, leading to a lower vapour pressure than expected from Raoult's law.
This is because the hydrogen atom of chloroform forms a hydrogen bond with the oxygen atom of acetone.
The formation of this intermolecular hydrogen bond makes the attractive forces between the unlike molecules stronger than the attractive forces between the like molecules.
As a result, the escaping tendency of the molecules from the liquid phase decreases, leading to a lower vapour pressure than expected from Raoult's law.
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