Choose the best answer for each question and code it onto the Scantron make extr

Question

Choose the best answer for each question and code it onto the Scantron make extrancous scratch paper. Mark answer know what your answers were w sheet. Fill in the Scantron sheet carefully; dom't your answers on the exam paper in addition to coding them into the Scantron sheet, so that you will marks on it. Only answers on the Scantron sheet will be scored. Use the backs of the exam pages as hen you download the key from BlackBoard. 1. Based on the Periodic Table, which of the following is the largest ion (has the largest ionic radius)? (a) Cs" (b) Sb (c) I (d) Ba (e) As 2. Based on Lewis dot pictures and VSEPR theory, what is the most likely molecular geometry of sulfate ion, So (a) linear (d) seesaw (e) square planar (b) square pyramidal (c) tetrahedral of SCL? 3. Based on Lewis dot pictures and VSEPR theory, what is the most likely molecular geometry (a) linear (d) seesaw (e) square planar (b) square pyramidal (c) tetrahedral 4. Based on Lewis dot pictures and VSEPR theory, which of the fol lowing best describes the molecular geometry and electron placement in CIF, anion? (a) CIF: anion is angular/bent 109.5" with a central CI atom and no lone pairs on the CI atom. (b) CIF, anion is angular bent 109.5 with a central CI atom and one lone pair on the CI atom. (e) CIF: anion is angular/bent 120 with a central CI atom and two lone pairs on the CI atom (d) CIF; anion is linear with a central CI atom and two lone pairs on the Cl atom. (e) CIF; anion is lincar with a central CI atom and three lone pairs on the Cl atom 5. The graphic to the right shows a set of valence bond theory hybrid orbitals. What type of hybrid orbitals are they? (a) sp 6. According to valence bond theory, what is the orbital hybridization on the carbon atom in CH OH? (b) sp (d) sp (e)s p (a) sp (c) sp 7. According to valence bond theory, what is the orbital bybridization on the carbon atom in CO? (b) sp (d) sp' (e) (a) sp 8. According to molecular orbital theory, what are the key features that distinguish between o-bonding molecular orbitals ( MOs) and 0-antibonding molecular orbitals (* MOs)? (a) MOs are lower in energy than * MOs and do not have nodal surfaces (nodes) between the nuclei. (b) MOs are higher in energy than . Mos and do not have nodal surfaces (nodes) between the nuclei. (c) MOs are lower in energy than . Mos and have at least one nodal surface (node) between the nuclei. (d) MOs are higher in energy than . Mos and have at least one nodal surface (node) between the nuclei. (e) none of these is true.

Explanation / Answer

1.b. Sb^3-
    2. c. tetrahydral
    3. d. seesaw
    4. [F-Cl-F]^- central atom cl has three lone pair of electrons anf two
       bond pair of electrons . So it has linear shape.
      e. ClF2^- anion is linear with a central Cl atom and three lone pair
       on the Cl atom.
    5. trigonal planar
        b . Sp^2
    6.c. Sp^3
    7.a. Sp
    8.c

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