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We expect that all dipole moments for each bond cancel out. Even though the bonds would be polar due to the difference in electronegativities, they would still cancel out due to symmetry.
Writing the Lewis structure of the compound, we shall have:
Consider an AB3 molecule in which A and B differ in electronegativity. You are told that the molecule has an overall dipole moment of zero. Which of the following could be the molecular geometry of the molecule?
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