Chapter 10 1 Give the approximate bond angle for a molecule with an

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Chemistry: A Molecular Approach, 2e (Tro)

Chapter 10 Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and Molecular

Orbital Theory

Multiple Choice Questions

1) Give the approximate bond angle for a molecule with an octahedral shape.

A) 109.5°

B) 180°

C) 120°

D) 105°

E) 90°

2) Determine the electron geometry (eg) and molecular geometry(mg) of BCl3.

A) eg=trigonal planar, mg=trigonal planar

B) eg=tetrahedral, mg=trigonal planar

C) eg=tetrahedral, mg=trigonal pyramidal

D) eg=trigonal planar, mg=bent

E) eg=trigonal bipyramidal, mg= trigonal bipyramidal

3) Determine the electron geometry (eg) and molecular geometry (mg) of CO32⁻.

A) eg=tetrahedral, mg=tetrahedral

B) eg=tetrahedral, mg=trigonal pyramidal

C) eg=trigonal planar, mg=bent

D) eg=trigonal planar, mg=trigonal planar

E) eg=tetrahedral, mg=trigonal planar

4) Determine the electron geometry (eg) and molecular geometry (mg) of CH3+1.

A) eg=tetrahedral, mg=tetrahedral

B) eg=tetrahedral, mg=trigonal pyramidal

C) eg=trigonal planar, mg=bent

D) eg=trigonal planar, mg=trigonal planar

E) eg=tetrahedral, mg=trigonal planar

5) Determine the electron geometry (eg) and molecular geometry (mg) of SiF4.

A) eg=tetrahedral, mg=trigonal pyramidal

B) eg=octahedral, mg=square planar

C) eg=trigonal bipyramidal, mg=trigonal pyramidal

D) eg=tetrahedral, mg=bent

E) eg=tetrahedral, mg=tetrahedral

6) Determine the electron geometry (eg) and molecular geometry (mg) of PF5.

A) eg=trigonal bipyramidal, mg=trigonal bipyramidal

B) eg=octahedral, mg=octahedral

C) eg=trigonal bipyramidal, mg=tetrahedral

D) eg=tetrahedral, mg=trigonal pyramidal

E) eg=trigonal planar, mg=octahedral

7) Determine the electron geometry (eg) and molecular geometry (mg) of CO2.

A) eg=tetrahedral, mg=tetrahedral

B) eg=linear, mg=trigonal planar

C) eg=trigonal planar, mg=bent

D) eg=linear, mg=linear

E) eg=trigonal planar, mg=trigonal planar

8) The bond angle in NH3 is

A) 107°

B) 104.5°

C) 120°

D) 109.5°

E) 95°

9) The bond angle in H2O is

A) 107°

B) 104.5°

C) 120°

D) 109.5°

E) 95°

10) Determine the electron geometry (eg) and molecular geometry (mg) of NCl3.

A) eg=tetrahedral, mg=tetrahedral

B) eg=linear, mg=trigonal planar

C) eg=trigonal planar, mg=bent

D) eg=linear, mg=linear

E) eg=tetrahedral, mg=trigonal pyramidal

11) Determine the electron geometry (eg) and molecular geometry (mg) of ICl3.

A) eg=trigonal planar, mg=trigonal planar

B) eg=trigonal bipyramidal, mg= T-shape

C) eg=trigonal planar, mg=bent

D) eg=trigonal bipyramidal, mg=see-saw

E) eg=tetrahedral, mg=trigonal pyramidal

12) Determine the electron geometry (eg) and molecular geometry (mg) of ICl2⁻.

A) eg=tetrahedral, mg=bent

B) eg=tetrahedral, mg=trigonal pyramidal

C) eg=trigonal bipyramidal, mg=linear

D) eg=trigonal bipyramidal, mg=trigonal planar

E) eg=octahedral, mg=linear

13) Determine the electron geometry (eg) and molecular geometry (mg) of XeF2.

A) eg=trigonal bipyramidal, mg=bent

B) eg=linear, mg=linear

C) eg=tetrahedral, mg=linear

D) eg=trigonal bipyramidal, mg=linear

E) eg=tetrahedral, mg=bent

14) Determine the electron geometry (eg) and molecular geometry (mg) of XeF4.

A) eg=tetrahedral, mg=tetrahedral

B) eg=linear, eg=linear

C) eg=tetrahedral, mg=bent

D) eg=trigonal bipyramidal, mg=tetrahedral

E) eg=octahedral, mg=square planar

15) Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom

CH3OCH3.

A) eg=tetrahedral, mg=tetrahedral

B) eg=linear, eg=linear

C) eg=tetrahedral, mg=bent

D) eg=trigonal bipyramidal, mg=tetrahedral

E) eg=octahedral, mg=square planar

16) Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom

CH3OCH3.

A) eg=tetrahedral, mg=tetrahedral

B) eg=linear, eg=linear

C) eg=tetrahedral, mg=bent

D) eg=trigonal bipyramidal, mg=tetrahedral

E) eg=octahedral, mg=square planar

17) Determine the electron geometry (eg) and molecular geometry (mg) of the underlined atom H2CO.

A) eg=tetrahedral, mg=tetrahedral

B) eg=trigonal planar, eg=trigonal planar

C) eg=tetrahedral, mg=bent

D) eg=trigonal bipyramidal, mg=tetrahedral

E) eg=octahedral, mg=square planar

18) Consider the molecule below. Determine the molecular geometry at each of the 2 labeled carbons.

A) C1 = tetrahedral, C2 = linear

B) C1 = trigonal planar, C2= bent

C) C1 = bent, C2 = trigonal planar

D) C1 = trigonal planar, C2 = tetrahedral

E) C1 = trigonal pyramidal, C2 = see-saw

19) Consider the molecule below. Determine the molecular geometry at each of the 3 labeled atoms.

A) 1=trigonal planar, 2=tetrahedral, 3=trigonal pyramidal

B) 1=tetrahedral, 2=tetrahedral, 3=tetrahedral

C) 1=trigonal planar, 2=tetrahedral, 3=tetrahedral

D) 1=tetrahedral, 2=tetrahedral, 3=trigonal planar

E) 1=trigonal planar, 2=trigonal pyramidal, 3=trigonal pyramidal

20) Place the following in order of increasing X-Se-X bond angle, where X represents the outer atoms

in each molecule.

SeO2 SeCl6 SeF2

A) SeCl6 < SeF2 < SeO2

B) SeF2 < SeO2 < SeCl6

C) SeF2 < SeCl6 < SeO2

D) SeO2 < SeF2 < SeCl6

E) SeCl6 < SeO2 < SeF2

21) Place the following in order of increasing F-A-F bond angle, where A represents the central atom in

each molecule.

PF3 OF2 PF4⁺

A) PF3 < OF2 < PF4⁺

B) OF2 < PF3 < PF4⁺

C) OF2 < PF4⁺ < PF3

D) PF4⁺ < OF2 < PF3

E) PF4⁺ < PF3 < OF2

22) Place the following in order of decreasing X-A-X bond angle, where A represents the central atom

and X represents the outer atoms in each molecule.

N2O NCl3 NO2⁻

A) NCl3 > NO2⁻ > N2O

B) NO2⁻ > N2O > NCl3

C) N2O > NO2⁻ > NCl3

D) NCl3 > N2O > NO2⁻

E) N2O > NCl3 > NO2⁻

23) Place the following in order of decreasing X-A-X bond angle, where A represents the central atom

and X represents the outer atoms in each molecule.

CS2 CF4 SCl2

A) CS2 = SCl2 > CF4

B) SCl2 > CF4 > CS2

C) CF4 > CS2 > SCl2

D) CS2 > CF4 > SCl2

E) CF4 > CS2 > SCl2

24) Place the following in order of increasing X-A-X bond angle, where A represents the central atom

and X represents the outer atoms in each molecule.

HCN H2O H3O⁺

A) H2O < H3O⁺ < HCN

B) H3O⁺ < H2O < HCN

C) HCN < H3O⁺ < H2O

D) H2O < HCN < H3O⁺

E) H2O < H3O⁺ < HCN

25) Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO3.

A) eg=tetrahedral, mg=trigonal pyramidal, polar

B) eg=tetrahedral, mg=tetrahedral, nonpolar

C) eg=trigonal planar, mg=trigonal planar, nonpolar

D) eg= trigonal bipyramidal, mg=trigonal planar, polar

E) eg=trigonal pyramidal, mg=bent, nonpolar

26) How many of the following molecules are polar?

BrCl3 CS2 SiF4 SO3

A) 1

B) 2

C) 3

D) 4

E) 0

27) How many of the following molecules are polar?

PCl5 COS XeO3 SeBr2

A) 2

B) 0

C) 1

D) 3

E) 4

28) Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO2.

A) eg=tetrahedral, mg=bent, polar

B) eg=trigonal planar, mg=bent, polar

C) eg=linear, mg=linear, nonpolar

D) eg=tetrahedral, mg=tetrahedral, nonpolar

E) eg=trigonal pyramidal, mg=trigonal pyramidal, polar

29) Determine the electron geometry (eg), molecular geometry (mg), and polarity of PCl3.

A) eg=tetrahedral, mg=bent, polar

B) eg=trigonal planar, mg=trigonal planar, nonpolar

C) eg=linear, mg=linear, nonpolar

D) eg=tetrahedral, mg=trigonal pyramidal, polar

E) eg=trigonal pyramidal, mg=trigonal pyramidal, polar

30) Determine the electron geometry, molecular geometry and polarity of SF6.

A) eg=trigonal bipyramidal, mg=trigonal bipyramidal, nonpolar

B) eg=tetrahedral, mg=tetrahedral, polar

C) eg=trigonal bipyramidal, mg=see-saw, polar

D) eg=octahedral, mg=trigonal bipyramidal, nonpolar

E) eg=octahedral, mg=octahedral, nonpolar

31) Determine the electron geometry (eg), molecular geometry(mg) and polarity of XeO3.

A) eg=trigonal planar, mg=trigonal planar, nonpolar

B) eg=tetrahedral, mg=trigonal pyramidal, polar

C) eg=trigonal planar, mg=trigonal pyramidal, polar

D) eg=trigonal bipyramidal, mg=trigonal planar, nonpolar

E) eg=octahedral, mg=tetrahedral, nonpolar

32) Determine the electron geometry, molecular geometry and polarity of HBrO2.

A) eg=trigonal bipyramidal, mg=trigonal planar, nonpolar

B) eg=octahedral, mg=square planar, nonpolar

C) eg=tetrahedral, mg=trigonal pyramidal, polar

D) eg=tetrahedral, mg=linear, nonpolar

E) eg=linear, mg=linear, polar

33) Place the following in order of increasing dipole moment.

I. BCl3 II. BIF2 III. BClF2

A) I < II = III

B) II < III < I

C) I < II < III

D) II < I < III

E) I < III < II

34) Place the following in order of decreasing dipole moment.

I. cis-CHCl=CHCl II. trans-CHCl=CHCI III. cis-CHF=CHF

A) III > I > II

B) II > I > III

C) I > III > II

D) II > III > I

E) I = III > II

35) Identify the number of electron groups around a molecule with sp hybridization.

A) 1

B) 2

C) 3

D) 4

E) 5

36) Identify the number of electron groups around a molecule with sp2 hybridization.

A) 1

B) 2

C) 3

D) 4

E) 5

37) Identify the number of electron groups around a molecule with a tetrahedral shape.

A) 1

B) 2

C) 3

D) 4

E) 5

38) Identify the number of electron groups around a molecule with a trigonal bipyramidal shape.

A) 1

B) 2

C) 3

D) 4

E) 5

39) Identify the number of electron groups around a molecule with an octahedral shape.

A) 6

B) 2

C) 3

D) 4

E) 5

40) Give the electron geometry (eg), molecular geometry (mg), and hybridization for NH3.

A) eg=tetrahedral, mg=trigonal planar, sp2

B) eg=trigonal pyramidal, mg=trigonal pyramidal, sp3

C) eg=tetrahedral, mg=trigonal pyramidal, sp3

D) eg=trigonal pyramidal, mg=tetrahedral, sp3

E) eg=trigonal planar, mg=trigonal planar, sp2

41) Give the electron geometry (eg), molecular geometry (mg), and hybridization for H2O.

A) eg=tetrahedral, mg=bent, sp3

B) eg=trigonal pyramidal, mg=trigonal pyramidal, sp3

C) eg=tetrahedral, mg=trigonal pyramidal, sp3

D) eg=bent, mg=bent, sp2

E) eg=trigonal planar, mg=trigonal planar, sp2

42) Give the electron geometry (eg), molecular geometry (mg), and hybridization for XeF4.

A) eg=tetrahedral, mg=tetrahedral, sp3

B) eg=trigonal pyramidal, mg=trigonal pyramidal, sp3

C) eg=octahedral, mg=square planar, sp3d2

D) eg=octahedral, mg=octahedral, sp3d2

E) eg=trigonal bipyramidal, mg=seesaw, sp3d

43) Give the hybridization for the O in OF2.

A) sp

B) sp3

C) sp2

D) sp3d

E) sp3d2

44) Give the hybridization for the O in H3O+.

A) sp

B) sp3

C) sp2

D) sp3d

E) sp3d2

45) Give the hybridization for the S in SO3.

A) sp

B) sp3

C) sp2

D) sp3d

E) sp3d2

46) Give the hybridization for the Br in BrO4⁻.

A) sp

B) sp3d2

C) sp3d

D) sp3

E) sp2

47) Give the hybridization for the S in SF6.

A) sp

B) sp2

C) sp3

D) sp3d

E) sp3d2

48) Give the hybridization for the Br in BrF5.

A) sp3d2

B) sp3d

C) sp3

D) sp2

E) sp

49) Give the hybridization for the Br in BrCl3.

A) sp3d2

B) sp3d

C) sp3

D) sp2

E) sp

50) Give the hybridization for the C in HCN.

A) sp3d2

B) sp3d

C) sp3

D) sp2

E) sp

51) Give the hybridization for the C in HCCH.

A) sp3d2

B) sp3d

C) sp3

D) sp2

E) sp

52) How many of the following molecules have sp2 hybridization on the central atom?

HCN SO2 OCl2 XeCl2

A) 4

B) 3

C) 2

D) 1

E) 0

53) Which of the following statements is TRUE?

A) The total number of molecular orbitals formed doesn’t always equal the number of atomic orbitals in

the set.

B) A bond order of 0 represents a stable chemical bond.

C) When two atomic orbitals come together to form two molecular orbitals, one molecular orbital will

be lower in energy than the two separate atomic orbitals and one molecular orbital will be higher in

energy than the separate atomic orbitals.

D) Electrons placed in antibonding orbitals stabilize the ion/molecule.

E) All of the above are true.

54) Use the molecular orbital diagram shown to determine which of the following is most stable.

A) F2

B) F22⁺

C) Ne22⁺

D) O22⁺

E) F22⁻

55) Use the molecular orbital diagram shown to determine which of the following are paramagnetic.

A) O22⁻

B) Ne22⁺

C) O22⁺

D) F22⁺

E) None of the above are paramagnetic.

56) Use the molecular orbital diagram shown to determine which of the following is most stable.

A) C22⁺

B) N22⁺

C) B2

D) C22⁻

E) B22⁺

57) Use the molecular orbital diagram shown to determine which of the following are paramagnetic.

A) B22⁺

B) B22⁻

C) N22⁺

D) C22⁻

E) B2

58) Draw the molecular orbital diagram shown to determine which of the following is most stable.

A) F2

B) F22⁺

C) Ne22⁺

D) O22⁺

E) F22⁻