Deck 10: The Shapes of Molecules

Question 1

Oxygen difluoride is a powerful oxidizing and fluorinating agent. Select its Lewis structure.

A)
B)
C)
D)
E) None of these choices is correct.

Answer 1

Question 2

In which one of the following is the best Lewis structure a resonance structure?

A) SO₃
B) BF₃
C) I₃^¯
D) SCO (C = central atom)
E) SO₃^2¯

Answer 2

SO₃^2¯

Question 3

In which one of the following species is the best Lewis structure a resonance structure?

A) NH₃
B) CO₂
C) SF₆
D) O₂
E) CO₃^2¯

Answer 3

CO₃^2¯

Question 4

In which one of the following molecules are all the bonds single?

A) O₃
B) POCl₃
C) CO
D) COCl₂
E) N₂H₄

Question 5

Which one of the following molecules contains a double bond?

A) N₂
B) PCl₅
C) CH₂O
D) C₂H₂
E) I₂

Question 6

Select the best Lewis structure for ClCN.

A)
B)
C)
D)
E)

Question 7

Select the correct Lewis structure for TeBr₂.

A)
B)
C)
D)
E)

Question 8

In which one of the following is the best Lewis structure a resonance structure?

A) CO₂ (C = central atom)
B) ClO₃^¯ (Cl = central atom)
C) COCl₂ (C = central atom)
D) NO₂⁺ (N = central atom)
E) HCN (C = central atom)

Question 9

In carbon disulfide, how many lone pairs of electrons are on each sulfur atom?

A) 0
B) 1
C) 2
D) 3
E) 4

Question 10

Hydrazine, N₂H₄, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

A)
B)
C)
D)
E) None of these choices is correct.

Question 11

Select the best Lewis structure for P₂I₄.

A)
B)
C)
D)
E) None of these structures is suitable for P₂I₄.

Question 12

How many electron pairs are shared between the carbon atoms in C₂H₄?

A) 5
B) 4
C) 3
D) 2
E) 1

Question 13

Select the correct Lewis structure for nitrogen trifluoride, NF₃.

A)
B)
C)
D)
E)

Question 14

In the nitrate ion (NO₃^¯), nitrogen and oxygen are held together by

A) ionic interactions.
B) covalent bonds.
C) dative bonds.
D) electronegativity.
E) network bonds.

Question 15

How many resonance structures are possible for NO₃^¯?

A) 1
B) 2
C) 3
D) 4
E) 5

Question 16

Which one of the following Lewis structures is definitely incorrect?

A) NO
B) HCN
C) NO₂^¯
D) SO₃^2¯
E) PCl₅

Question 17

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry. Select the best Lewis structure for SOCl₂.

A)
B)
C)
D)
E) None of these structures is suitable for SOCl₂.

Question 18

In neutral molecules, how many bonds are commonly formed by nitrogen? And how many by oxygen?

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

Question 19

Select the correct Lewis structure for NOCl, a reactive material used as an ionizing solvent.

A)
B)
C)
D)
E) None of these choices is correct.

Question 20

Which one of the following Lewis structures is definitely incorrect?

A) NO₂
B) BeCl₂
C) CO₃^2¯
D) CH₄
E) SO₂

Question 21

In which one of the following structures does the central atom have a formal charge of +2?

A) SF₆
B) SO₄^2¯
C) O₃
D) BeCl₂
E) AlCl₄^¯

Question 22

Which of the following atoms can expand its valence shell when bonding?

A) N
B) C
C) O
D) P
E) Al

Question 23

How many faces and how many vertexes (corners), respectively, are there in a trigonal bipyramid?

A) 4 and 4
B) 5 and 5
C) 5 and 6
D) 6 and 5
E) 6 and 8

Question 24

According to VSEPR theory, a molecule with the general formula AX₃ will have a ______ molecular shape.

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

Question 25

Phosphoryl iodide is used in the preparation of organophosphorus derivatives and phosphate esters. Select the Lewis structure for POI₃ which minimizes formal charges.

A)
B)
C)
D)
E)

Question 26

Considering all the bonds in a molecule with trigonal bipyramidal geometry, what are the bond angles present?

A) 120 $\degree$ only
B) 90 $\degree$ only
C) 180 $\degree$ only
D) 60 $\degree$ and 90 $\degree$ only
E) 90 $\degree$ , 120 $\degree$ and 180 $\degree$

Question 27

In which of the following does the nitrogen atom have a formal charge of -1?

A)
B)
C)
D)
E)

Question 28

In which one of the following species is the central atom (the first atom in the formula) likely to violate the octet rule?

A) BF₄^¯
B) XeO₃
C) SiCl₄
D) NH₃
E) CH₂Cl₂

Question 29

Select the Lewis structure in which formal charges are minimized for the periodate anion, IO₄^¯.

A)
B)
C)
D)
E)

Question 30

The formal charges on Cl and O in the structure shown for the ClO^¯ ion are, respectively:

A) 0 and -1
B) -1 and 0
C) 1 and -2
D) -2 and 1
E) None of these choices is correct.

Question 31

According to VSEPR theory, a molecule with the general formula AX₄ will have a ______ molecular shape.

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

Question 32

The best Lewis structure for sulfuric acid has zero formal charges, sulfur as the central atom, and no bonds between S and H. How many single and double bonds, respectively, are there in this Lewis structure?

A) 2 single, 4 double
B) 4 single, 2 double
C) 4 single, no double
D) 6 single, no double
E) 5 single, 1 double

Question 33

In the COCl₂ molecule, carbon is the central atom. Based on the best Lewis structure for COCl₂, what is the formal charge on carbon?

A) 0
B) +1
C) -1
D) +2
E) -2

Question 34

According to VSEPR theory, a molecule with the general formula AX₂ will have a ___ molecular shape.

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

Question 35

In which one of the following species is the central atom (the first atom in the formula) an exception to the octet rule?

A) NH₃
B) NH₄⁺
C) I₂
D) BH₄^¯
E) SF₆

Question 36

In the following Lewis structure for phosphate, phosphorus has a formal charge of ____ and an oxidation number of ____.

A) 0, -3
B) 0, 5
C) 5, -3
D) 5, 5
E) 3, 5

Question 37

The formal charge on Cl in the structure shown for the perchlorate ion is:

A) -2
B) -1
C) 0
D) +1
E) +2

Question 38

Select the Lewis structure for XeO₂F₂ which correctly minimizes formal charges.

A)
B)
C)
D)
E)

Question 39

According to VSEPR theory, a molecule with the general formula AX₅ will have a ______ molecular shape.

A) tetrahedral
B) trigonal planar
C) trigonal pyramidal
D) trigonal bipyramidal
E) see-saw

Question 40

In the following Lewis structure for ClO₃F, chlorine has a formal charge of ____ and an oxidation number of ____.

A) 7, 7
B) 7, -1
C) 1, 1
D) 1, -1
E) 1, 7

Question 41

What is the molecular shape of NO₂^¯ as predicted by the VSEPR theory?

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

Question 42

What is the molecular shape of N₂O as predicted by the VSEPR theory?

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

Question 43

What is the molecular shape of NH₂Cl as predicted by the VSEPR theory?

A) trigonal pyramidal
B) tetrahedral
C) T-shaped
D) see-saw
E) trigonal planar

Question 44

What is the molecular shape of the thiocyanate anion, SCN^¯, as predicted by the VSEPR theory? (Carbon is the central atom.)

A) linear
B) bent
C) angular
D) trigonal
E) None of these choices is correct.

Question 45

What is the molecular shape of NOCl as predicted by the VSEPR theory?

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

Question 46

According to VSEPR theory, a molecule with the general formula AX₂E₃ will have a _____ molecular shape.

A) bent
B) linear
C) trigonal planar
D) T-shaped
E) trigonal pyramidal

Question 47

What is the molecular shape of ClCN as predicted by the VSEPR theory? (Carbon is the central atom.)

A) linear
B) bent
C) angular
D) trigonal
E) None of these choices is correct.

Question 48

According to VSEPR theory, a molecule with the general formula AX₃E₂ will have a _____ molecular shape.

A) trigonal pyramidal
B) trigonal bipyramidal
C) trigonal planar
D) T-shaped
E) see-saw

Question 49

What is the molecular shape of BeH₂ as predicted by the VSEPR theory?

A) linear
B) bent
C) angular
D) trigonal
E) None of these choices is correct.

Question 50

According to VSEPR theory, a molecule with the general formula AX₂E₂ will have a _____ molecular shape.

A) linear
B) bent
C) trigonal planar
D) tetrahedral
E) see-saw

Question 51

According to VSEPR theory, a molecule with the general formula AX₅E will have a ______ molecular shape.

A) tetrahedral
B) trigonal bipyramidal
C) square pyramidal
D) octahedral
E) see-saw

Question 52

What is the molecular shape of HOF as predicted by the VSEPR theory?

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

Question 53

What is the molecular shape of ClO₃F as predicted by the VSEPR theory?

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

Question 54

What is the molecular shape of BCl₃ as predicted by the VSEPR theory?

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

Question 55

According to VSEPR theory, a molecule with the general formula AX₃E will have a _____ molecular shape.

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

Question 56

What is the molecular symmetry around the carbons in CCl₂CH₂ as predicted by the VSEPR theory?

A) linear
B) trigonal planar
C) V-shaped
D) tetrahedral
E) trigonal pyramidal

Question 57

According to VSEPR theory, a molecule with the general formula AX₄E₂ will have a _____ molecular shape.

A) tetrahedral
B) square pyramidal
C) square planar
D) octahedral
E) see-saw

Question 58

According to VSEPR theory, a molecule with the general formula AX₆ will have a ______ molecular shape.

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

Question 59

According to VSEPR theory, a molecule with the general formula AX₂E will have a ______ molecular shape.

A) bent
B) see-saw
C) trigonal planar
D) T-shaped
E) trigonal pyramidal

Question 60

According to VSEPR theory, a molecule with the general formula AX₄E will have a _____ molecular shape.

A) bent
B) see-saw
C) trigonal planar
D) T-shaped
E) square planar

Question 61

Predict the ideal bond angles around nitrogen in N₂F₂ using the molecular shape given by the VSEPR theory. (The two N atoms are the central atoms.)

A) 90 $\degree$
B) 109 $\degree$
C) 120 $\degree$
D) 180 $\degree$
E) between 120 and 180 $\degree$

Question 62

Predict the ideal bond angles in FNO using the molecular shape given by the VSEPR theory.

A) 90 $\degree$
B) 109 $\degree$
C) 120 $\degree$
D) 180 $\degree$
E) between 120 and 180 $\degree$

Question 63

What is the molecular shape of ClF₄^¯ as predicted by the VSEPR theory?

A) square pyramidal
B) square planar
C) see-saw
D) octahedral
E) tetrahedral

Question 64

Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom is always first in the formula.)

A) BrF₃
B) H₃O⁺
C) PCl₃
D) SO₄^2¯
E) SF₄

Question 65

Predict the smallest actual bond angle in BrF₃ using the VSEPR theory.

A) more than 120 $\degree$
B) exactly 120 $\degree$
C) between 109 $\degree$ and 120 $\degree$
D) between 90 $\degree$ and 109 $\degree$
E) less than 90 $\degree$

Question 66

Predict the ideal bond angles around carbon in C₂I₂ using the molecular shape given by the VSEPR theory.

A) 90 $\degree$
B) 109 $\degree$
C) 120 $\degree$
D) 180 $\degree$
E) None of these choices is correct.

Question 67

Use VSEPR theory to decide which one of the following molecules and ions will definitely have at least one 90 $\degree$ bond angle in it. (In each case except water, the central atom is the first one in the formula.)

A) AlCl₄^¯
B) NH₃
C) PCl₅
D) CO₂
E) H₂O

Question 68

Predict the ideal bond angles in AsCl₃ using the molecular shape given by the VSEPR theory.

A) 90 $\degree$
B) 109 $\degree$
C) 120 $\degree$
D) 180 $\degree$
E) between 110 and 120 $\degree$

Question 69

Use VSEPR theory to predict the electron group arrangement around iodine, the central atom in the ion IF₂^¯.

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

Question 70

What is the molecular shape of SiF₆^2¯ as predicted by the VSEPR theory?

A) trigonal bipyramidal
B) hexagonal
C) tetrahedral
D) see-saw
E) octahedral

Question 71

What is the molecular shape of ClF₂^¯ as predicted by the VSEPR theory?

A) linear
B) bent
C) see-saw
D) T-shaped
E) L-shaped

Question 72

Use VSEPR theory to decide which one of the following molecules and ions will have a trigonal pyramidal geometry. (The central atom is always first in the formula.)

A) PCl₃
B) BF₃
C) SO₃
D) BrF₃
E) CO₃^2¯

Question 73

Predict the ideal bond angles in IF₂^¯ using the molecular shape given by the VSEPR theory.

A) 60 $\degree$
B) 90 $\degree$
C) 109 $\degree$
D) 120 $\degree$
E) 180 $\degree$

Question 74

List all possible molecular geometries (shapes) for a nonpolar molecule with the formula AX₄.

A) tetrahedral
B) seesaw
C) square planar
D) either tetrahedral or square planar
E) All of these choices are possible.

Question 75

Which one of the following molecules and ions will have a planar geometry?

A) PCl₃
B) BF₄^¯
C) XeF₄
D) BrF₅
E) H₃O⁺

Question 76

What is the molecular shape of XeO₂F₂ as predicted by the VSEPR theory?

A) square planar
B) tetrahedral
C) square pyramidal
D) see-saw
E) octahedral

Question 77

Predict the ideal bond angles in GeCl₄ using the molecular shape given by the VSEPR theory.

A) 90 $\degree$
B) 109 $\degree$
C) 120 $\degree$
D) 180 $\degree$
E) < 90 $\degree$

Question 78

What is the molecular shape of SCl₃F as predicted by the VSEPR theory?

A) linear
B) bent
C) see-saw
D) T-shaped
E) trigonal pyramidal

Question 79

Predict the actual bond angles in SF₃⁺ using the VSEPR theory.

A) more than 120 $\degree$
B) exactly 120 $\degree$
C) between 109 $\degree$ and 120 $\degree$
D) between 90 $\degree$ and 109 $\degree$
E) less than 90 $\degree$

Question 80

Predict the actual bond angle in SeCl₂ using the VSEPR theory.

A) more than 120 $\degree$
B) between 109 $\degree$ and 120 $\degree$
C) between 90 $\degree$ and 109 $\degree$
D) exactly 90 $\degree$
E) less than 90 $\degree$