Which one of the following molecules has zero dipole moment?
Correct answer: C. BF3
- A. NH3
- B. CHCl3
- C. BF3
- D. H2O
Explanation
A is incorrect because NH3 molecule has dipole moment 1.49B is incorrect because CHCl3 molecule has dipole moment 1.01C is correct since BF3 molecule has dipole moment 0 because of its geometryD is incorrect because H2O molecule has dipole moment 1.85
This question appeared on the UHS MDCAT 2010 paper, which you can sit online with every answer explained.
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About Dipole Moment
Dipole moment measures the separation of positive and negative charge in a bond or molecule, with magnitude related to charge and distance, μ = q r. Questions distinguish polar bonds from polar molecules by considering bond direction, molecular geometry and whether individual bond moments cancel through symmetry.
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