Deck 10: Molecular Geometry and Chemical Bonding Theory

Question 1

The approximate H-C-C bond angle in ethane,C₂H₆,is

A)60°.
B)180°.
C)120°.
D)109°.
E)90°.

Answer 1

109°.

Question 2

Which molecule or ion has a trigonal planar molecular geometry?

A)PCl₃
B)HCN
C)CO₃^2-
D)HCCH
E)AsF₃

Answer 2

CO₃^2-

Question 3

Which molecule or ion has a trigonal pyramidal molecular geometry?

A)BF₃
B)C₂H₄
C)SO₃
D)SO₃^2-
E)CO₃^2-

Answer 3

SO₃^2-

Question 4

Which molecule or ion does not have a trigonal pyramidal molecular geometry?

A)PO₃^3-
B)SO₃^2-
C)NI₃
D)BF₃
E)XeO₃

Question 5

Which molecule or ion is nonlinear?

A)NO₂⁺
B)SO₂
C)NNO
D)CS₂
E)SCN^-

Question 6

Which molecule or ion is nonlinear?

A)N₂O
B)O₃
C)OCN^-
D)NO₂⁺
E)CS₂

Question 7

What is the electron geometry (or electron arrangement)around an atom in a molecule or ion which is surrounded by three lone pairs of electrons and two single bonds.

A)trigonal bipyramidal
B)see-saw or distorted tetrahedron
C)T-shaped
D)linear
E)trigonal planar

Question 8

What is the electron geometry (or electron arrangement)around an atom in a molecule or ion which is surrounded by three lone pairs of electrons and one single bond.

A)tetrahedral
B)trigonal pyramidal
C)trigonal planar
D)bent
E)linear

Question 9

The approximate CCO angle in acetone, ,is

A)180°.
B)90°.
C)109°.
D)60°.
E)120°.

Question 10

Which molecule or ion is not planar?

A)XeF₄
B)NO₃^-
C)BCl₃
D)F₂CCF₂
E)CF₄

Question 11

Which molecule or ion has a trigonal pyramidal molecular geometry?

A)H₂CO
B)H₂CCO
C)CH₃⁺
D)CH₃^-
E)C₂H₄

Question 12

What is the molecular geometry around an atom in a molecule or ion which is surrounded by five single bonds and no lone pairs of electrons.

A)trigonal bipyramidal
B)octahedral
C)linear
D)trigonal planar
E)tetrahedral

Question 13

Which molecule or ion is not planar?

A)H₂CO
B)NO₂^-
C)C₂F₄
D)H₂CCO
E)PO₄^3-

Question 14

What is the molecular geometry around an atom in a molecule or ion which is surrounded by one lone pair of electrons and four single bonds.

A)see-saw or distorted tetrahedron
B)trigonal bipyramidal
C)linear
D)T-shaped
E)trigonal planar

Question 15

Which molecule or ion is nonlinear?

A)CO₂
B)NF₂^-
C)OCN^-
D)NO₂⁺
E)HCCH

Question 16

The approximate H-C-H bond angle in CH₃⁺ is

A)60°.
B)90°.
C)120°.
D)109°.
E)180°.

Question 17

What is the molecular geometry around an atom in a molecule or ion which is surrounded by two lone pairs of electrons and four single bonds.

A)square planar
B)square pyramidal
C)octahedral
D)bent
E)linear

Question 18

What is the molecular geometry around an atom in a molecule or ion which is surrounded by one lone pair of electrons and three single bonds.

A)trigonal pyramidal
B)tetrahedral
C)linear
D)bent
E)trigonal planar

Question 19

What is the electron geometry (or electron arrangement)around an atom in a molecule or ion which is surrounded by zero lone pairs of electrons and six single bonds.

A)octahedral
B)square pyramidal
C)square planar
D)bent
E)linear

Question 20

Which molecule or ion has the same molecular geometry for its central atom as the carbonate ion?

A)H₂CO
B)AsCl₃
C)PF₃
D)CH₃^-
E)BrO₃^-

Question 21

Which molecule does not have a planar molecular geometry?

A)SO₃
B)HCCH
C)N₂H₄
D)HNNH
E)C₂F₄

Question 22

Which molecule or ion does not have a trigonal pyramidal molecular geometry?

A)AsF₃
B)NF₃
C)PF₃
D)BF₃
E)IO₃^-

Question 23

What is the molecular geometry of the thiosulfate ion,S₂O₃^2-?

A)tetrahedral
B)trigonal bipyramidal
C)pyramidal
D)bent
E)square planar

Question 24

Which molecule or ion does not have a planar molecular geometry?

A)NO₃^-
B)BF₃
C)F₂CO
D)C₂H₄
E)SO₃^2-

Question 25

The molecular geometry of the CH₃^- ion is

A)tetrahedral.
B)square planar.
C)square pyramidal.
D)trigonal planar.
E)trigonal pyramidal.

Question 26

Which molecule or ion has the same molecular geometry as SeO₃^2-?

A)SeO₃
B)CO₃^2-
C)NO₃^-
D)SO₃^2-
E)SO₃

Question 27

The molecular geometry of the CH₃⁺ ion is best described as

A)trigonal planar.
B)pyramidal.
C)linear.
D)bent.
E)tetrahedral.

Question 28

Which molecule or ion has the same molecular geometry for its central atom(s)as BF₃?

A)CF₄
B)CH₃^-
C)BF₄^-
D)C₂F₄
E)C₂F₆

Question 29

The molecular geometry of the nitrite ion,NO₂^- _, is best described as

A)pyramidal.
B)trigonal pyramidal.
C)bent.
D)tetrahedral.
E)trigonal planar.

Question 30

What is the predicted H-N-H bond angle in the ammonium ion?

A)109.5°
B)90°
C)180°
D)120°
E)45°

Question 31

The molecular geometry of the ammonium ion,NH₄⁺,is most similar to the molecular geometry of

A)NH₃.
B)CH₄.
C)N₂H₄.
D)NH₂^-.
E)CH₃⁺.

Question 32

The molecule AX₃,in which A is the central atom,is polar and obeys the octet rule; therefore,

A)A has two lone pairs.
B)A has one lone pair.
C)A has no lone pairs.
D)A has four bonding pairs.
E)A has three lone pairs.

Question 33

In phosgene,COCl₂,the electron groups are located about the central carbon atom in a ______________ arrangement.

A)square planar
B)trigonal bipyramidal
C)pyramidal
D)trigonal planar
E)tetrahedral

Question 34

What is the bond angle in a trigonal planar molecule or ion?

A)109°
B)180°
C)90°
D)72°
E)120°

Question 35

Which molecule or ion is not planar?

A)CO₃^2-
B)Cl₂CCCl₂
C)HNNH
D)H₃O⁺
E)F₂CO

Question 36

What is the molecular geometry around carbon atom C₁?
​

A)tetrahedral
B)trigonal planar
C)linear
D)trigonal pyramidal
E)bent

Question 37

What is the C-C-H bond angle in H₂CCO?

A)109°
B)180°
C)120°
D)144°
E)90°

Question 38

For which of the following molecules or ions do the electron pairs on the central nitrogen atom have a tetrahedral arrangement?

A)FNO
B)NF₂^-
C)N₂F₂
D)NO₂^-
E)NO^-

Question 39

What is the O-N-O bond angle in the nitrite ion?

A)90°
B)180° and 90°
C)180°
D)120°
E)109°

Question 40

In the hydronium ion,H₃O⁺,the electron groups are arranged about the central oxygen atom in a

A)tetrahedron.
B)square plane.
C)pyramid.
D)trigonal plane.
E)bent structure.

Question 41

What is the H-C-C bond angle in ethylene,H₂CCH₂?

A)slightly less than 120°
B)90°
C)109°
D)120°
E)180°

Question 42

Which of the following molecules is nonpolar?

A)
B)
C)
D)
E)

Question 43

What is the H-O-H bond angle in water?

A)90°
B)slightly less than 109°
C)180°
D)120°
E)109°

Question 44

Which of the following statements correctly describes the reaction of BF₃ with NH₃ to form F₃B-NH₃?

A)Both nitrogen and boron change from trigonal planar to tetrahedral geometry during the reaction.
B)Boron changes from trigonal planar to tetrahedral geometry during the reaction.
C)There are no changes in the formal charge on any atom during the reaction.
D)Nitrogen changes from trigonal planar to tetrahedral geometry during the reaction.
E)There is no change in geometry around the nitrogen or boron atoms.

Question 45

Which of the following molecules has a permanent dipole moment?

A)SF₆
B)CCl₄
C)NF₃
D)SiCl₄
E)BF₃

Question 46

What is the molecular geometry around oxygen atom O₁?
​

A)bent
B)tetrahedral
C)see-saw or distorted tetrahedral
D)trigonal planar
E)T-shaped

Question 47

Which molecule or ion does not have a tetrahedral molecular geometry?

A)BF₄^-
B)NF₄⁺
C)GeF₄
D)XeF₄
E)BeF₄^2-

Question 48

In the ICI₄^- ion,how many electron groups surround the central iodine atom?

A)2
B)4
C)5
D)6
E)3

Question 49

Which molecule or ion does not have a tetrahedral molecular geometry?

A)ICl₄^-
B)CCl₄
C)GeCl₄
D)BrO₄^-
E)SiCl₄

Question 50

Which of the following molecules does not have a permanent dipole moment?

A)iodine trichloride,ICl₃
B)nitrogen trifluoride,NF₃
C)sulfur dioxide,SO₂
D)carbon tetrachloride,CCl₄
E)hydrogen fluoride,HF

Question 51

In the I₃^- ion,how many electron groups surround the central atom?

A)5
B)3
C)6
D)4
E)2

Question 52

What is the molecular geometry of the bromate ion,BrO₃^-?

A)square planar
B)trigonal planar
C)square pyramidal
D)tetrahedral
E)trigonal pyramidal

Question 53

Which molecule or ion does not have a tetrahedral molecular geometry?

A)ClF₄^-
B)SiF₄
C)NF₄⁺
D)CF₄
E)BF₄^-

Question 54

Which of the following molecules has a dipole moment?

A)PF₅
B)FOOF
C)HCCH
D)F₂CCF₂
E)SF₆

Question 55

Which molecule is polar?

A)C₂H₄
B)CS₂
C)C₆H₆
D)SO₂
E)CF₄

Question 56

What is the molecular geometry of the ICl₄^- ion?

A)octahedral
B)pentagonal
C)tetrahedral
D)rectangular
E)square planar

Question 57

In ClF₃,the electron pairs are arranged about the chlorine atom in

A)a square plane.
B)a tetrahedron.
C)an octahedron.
D)a trigonal pyramid.
E)a trigonal bipyramid.

Question 58

In the ICl₄^- ion,the electron pairs are arranged around the central iodine atom in the shape of

A)a tetrahedron.
B)an octahedron.
C)a square plane.
D)a trigonal bipyramid.
E)a trigonal pyramid.

Question 59

Which of the following characteristics does not apply to PF₃?

A)has three σ bonds
B)contains polar bonds
C)polar molecule
D)one lone pair of electrons on phosphorus
E)trigonal planar

Question 60

For which molecule or ion does the nitrogen atom have the positive end of the dipole moment?

A)NH₄⁺
B)CN−
C)NO
D)HCN
E)N₂

Question 61

What is the hybridization of Se in SeF₆?

A)sp³d
B)sp³d²
C)sp²
D)sp
E)sp³

Question 62

What is the hybridization of Br in BrF₃?

A)sp³
B)sp
C)sp³d²
D)sp²
E)sp³d

Question 63

Which one of the following statements provides the best evidence that all the carbon compounds listed below have tetrahedral molecular geometries instead of square planar molecular geometries?

A)Only one CH₄ compound is known and it is nonpolar.
B)Only one CH₃F compound is known and it is polar.
C)Only one CH₂F₂ compound is known and it is polar.
D)Only one CF₄ compound is known and it is nonpolar.
E)Only one CHF₃ compound is known and it is polar.

Question 64

According to valence-bond theory,what is the hybridization scheme of the sulfur atom in SF₄?

A)
B)
C)
D)
E)

Question 65

What is the hybridization of the nitrogen atom in the nitrite ion?

A)sp³d
B)sp³
C)s
D)sp
E)sp²

Question 66

What hybrid orbitals of sulfur are involved in the bonding in sulfur trioxide?

A)sp²
B)sp²d
C)sp³
D)sp³d²
E)sp

Question 67

Which of the following compounds is nonpolar?

A)H₂S
B)XeF₂
C)SO₂
D)N₂O
E)HCl

Question 68

Which of the following molecules is polar?

A)SF₆
B)CCl₄
C)BF₃
D)NO₂
E)CO₂

Question 69

Which of the following statements is true?

A)A π bond is twice as strong as a single bond.
B)A π bond results from the sideways overlap of hybridized orbitals.
C)A double bond consists of a π bond and a σ bond.
D)A π bond has cylindrical symmetry about the bonding axis.
E)A π bond is twice as strong as a σ bond.

Question 70

A π bond is the result of the

A)overlap of two s orbitals.
B)overlap of two p orbitals along their axes.
C)sideways overlap of two parallel p orbitals.
D)overlap of an s orbital and a p orbital.
E)sideways overlap of two s orbitals.

Question 71

What is the hybridization of I in IF₄^-?

A)sp²
B)sp
C)sp³d
D)sp³d²
E)sp³

Question 72

Which of the following molecules has a dipole moment?

A)SO₂
B)CS₂
C)ClCCCCCl
D)CCl₄
E)HCCH

Question 73

When an atom in a molecule or ion is described as sp³d¹ hybridized,its molecular geometry is

A)trigonal bipyramidal.
B)trigonal planar.
C)linear.
D)tetrahedral.
E)octahedral.

Question 74

Which molecule or ion does not contain two π bonds?

A)HCCH
B)H₂CCCH₂
C)NO^-
D)CS₂
E)SCN^-

Question 75

How many sigma and pi bonds are in the molecule pictured below?

A)thirteen sigma bonds and one pi bond
B)eleven sigma bonds and two pi bonds
C)thirteen sigma bonds and two pi bonds
D)eleven sigma bonds and five pi bonds
E)five sigma bonds and eleven pi bonds

Question 76

Which of the following molecules is nonpolar?

A)SF₄
B)PF₅
C)ClF₃
D)PF₃
E)CH₂F₂

Question 77

Which of the following statements is incorrect regarding the water molecule?

A)There are two lone pairs and two bonding pairs on the central atom.
B)The molecule is polar.
C)The hybridization of oxygen is sp³.
D)The hybridization of hydrogen is sp.
E)The molecular geometry is bent.

Question 78

Which of the following statements best describes N₂O?

A)The molecular geometry is bent and the molecule is nonpolar.
B)The molecular geometry is linear and the molecule is nonpolar.
C)The molecular geometry is linear and the molecule is polar.
D)The molecular geometry is trigonal planar and the molecule is nonpolar.
E)The molecular geometry is bent and the molecule is polar.

Question 79

Which of the labeled carbons (C₁-C₄)is/are sp-hybridized?
​

A)carbon three
B)carbon one
C)carbon two and four
D)carbon two
E)carbon one and three

Question 80

According to valence-bond theory,the bonding in ketene,H₂CCO,is best described as

A)five π bonds.
B)three σ bonds and two π bonds.
C)four σ bonds and two π bonds.
D)four σ bonds and one π bond.
E)five σ bonds.