Created by StemPy LabA student claims that a molecule with lone pairs on its central atom can never have a zero dipole moment, because the lone pairs always spoil the symmetry. To test the claim, she works out the VSEPR shape of four fluorides. Each of them has at least one lone pair on the central atom. Which one of them has a zero dipole moment and so disproves her claim?
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← Four statements about equivalent masses and titrations are given. Atomic masses: H 1.0, O 16.0, P 31.0, K 39.0, Mn 55.0. The molar mass of KMnO₄ is 158.0 g mol⁻¹. One or more statements are correct. Which are correct?A teacher writes the Lewis structures of BCl₃, SF₆ and NO₂ on the board. She asks whether each atom obeys the octet rule. Read two statements made by students. Statement I: Boron in BCl₃ has only six electrons around it, and sulphur in SF₆ has twelve; both are exceptions to the octet rule. Statement II: In NO₂ every atom completes its octet, because the molecule has an even number of valence electrons. →
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