11) Choose the best Lewis structure for NO3 . A) B) C) D) E) 12) Identify the number of electron groups around a molecule with a trigonal bipyramidal shape. A) 1 B) 2 C) 3 D) 4 E) 5 13) Determine the electron geometry (eg) and molecular geometry(mg) of BC13. A) eg trigonal planar, mg trigonal planar C) eg tetrahedral, D) eg-trigonal planar, mg bent E) eg trigonal bipyramidal, mg trigonal bipyramidal 14) Determine the electron geometry (eg) and molecular geometry (mg) of SiF A) eg-tetrahedral, mg-trigonal pyramidal B) eg octahedral, mg square planar C) eg trigonal bipyramidal, mg-trígonal pyramidal D) eg tetrahedral, mg bent E) eg tetrahedral, mg tetrahedral

## Answer

11) Lewis structures in which the central atom with 8 electrons and with minimum or no formal charges are more stable. Hence, answer A

12) No. of electron groups around central atom in trigonal bipyramidal is 5. Hence answer is E

13) BCl3 contain 3 electron pairs around central boron atom.
Hence both electronic and molecular geometry is trigonal planar.
hence answer is A

14) SiH4 contain 4 electron pairs around central boron atom. Hence
both electronic and molecular geometry is tetrahedral. Hence answer
is E

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