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← ScienceWhich outcome results when an impurity increases molecular dipole moment?
A)Increased van der Waals forces
B)Decreased solution vapor pressure✓
C)Increased molecular kinetic energy
D)Decreased rate of chemical reaction
💡 Explanation
Vapor pressure decreases because increased dipole leads to stronger *dipole-dipole* intermolecular forces, thereby holding molecules in the liquid phase rather than vaporizing. Therefore, vapor pressure declines, rather than increasing kinetic energy caused by thermal interactions.
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