Question

A solution is formed by mixing chloroform (CHCl3) and acetone (CH3COCH3).
Which of the following is true regarding the nature of this solution?

• A. It shows positive deviation from Raoult’s law due to weak intermolecular forces
• B. It shows negative deviation due to strong dipole-dipole interactions
• C. It obeys Raoult’s law over the entire range of composition
• D. It forms an ideal solution with no enthalpy change

Hint:

In solutions with strong dipole-dipole interactions, expect a negative deviation from Raoult's law, where the solution exhibits a lower vapor pressure than predicted.

Answer 1

The Correct Option is B

When chloroform (CHCl3) and acetone (CH3COCH3) are mixed, the intermolecular forces between the molecules are stronger than the forces between the individual components. This leads to a negative deviation from Raoult’s law. In solutions where dipole-dipole interactions are significant, the deviation from Raoult’s law is negative, meaning the vapor pressure of the solution is lower than expected based on the mole fraction of each component. This is because the intermolecular interactions between the solute and solvent are stronger than those in the pure components.