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Among the following, which molecule has zero net dipole moment?
ACHCl₃
BH₂O
CNH₃
DBF₃
Answer & Solution
Correct answer: D. BF₃
**BF₃** is trigonal planar; the three equivalent B–F bond dipoles at 120° sum to zero. H₂O is bent (μ ≠ 0), NH₃ pyramidal (μ ≠ 0), CHCl₃ tetrahedral but unsymmetric (μ ≠ 0).
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