Question 1

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

Accepted Answer

A)  NH3
B)  NH4+
C)  I2
D)  BH4-
E)  SF6F) B) and E)
G) A) and E)

Question 2

The formal charges on Cl and O in the structure shown for the ClO- ion are,respectively - 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." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0 and -1
B)  -1 and 0
C)  1 and -2
D)  -2 and 1
E)  None of these choices is correct.F) None of the above
G) All of the above

Question 3

Thionyl chloride is used as an oxidizing and chlorinating agent in organic chemistry.Select the best Lewis structure for SOCl2. 2.   A) a B) b C) c D) d E) None of these structures is suitable for SOCl2." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  None of these structures is suitable for SOCl2.F) A) and E)
G) B) and D)

Question 4

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

Accepted Answer

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

Question 5

Explain what is meant by "dipole moment",and give an example of a molecule which has polar bonds but which does not itself have a dipole moment.

Accepted Answer

A dipole moment arises in a molecule whe...

Question 6

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

Accepted Answer

A)  60°
B)  90°
C)  109°
D)  120°
E)  180°F) A) and E)
G) C) and E)

Question 7

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

Accepted Answer

A)  BF4-
B)  XeO3
C)  SiCl4
D)  NH3
E)  CH2Cl2F) C) and D)
G) D) and E)

Question 8

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

Accepted Answer

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

Question 9

Select the correct Lewis structure for nitrogen trifluoride,NF3. 3.   A) a B) b C) c D) d E) e" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  eF) A) and E)
G) A) and D)

Question 10

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

Accepted Answer

A)  N
B)  C
C)  O
D)  P
E)  AlF) A) and B)
G) B) and D)

Question 11

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

Accepted Answer

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

Question 12

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

Accepted Answer

A)  SO3
B)  BF3
C)  I3-
D)  SCO (C = central atom) 
E)  SO32-F) C) and D)
G) A) and B)

Question 13

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

Accepted Answer

A)  linear
B)  bent
C)  trigonal planar
D)  tetrahedral
E)  triangularF) D) and E)
G) C) and E)

Question 14

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

Accepted Answer

A)  tetrahedral
B)  trigonal planar
C)  trigonal bipyramidal
D)  hexagonal
E)  octahedralF) A) and B)
G) C) and E)

Question 15

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

Accepted Answer

A)  linear
B)  bent
C)  trigonal planar
D)  tetrahedral
E)  trigonal pyramidalF) A) and B)
G) None of the above

Question 16

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

Accepted Answer

A)  trigonal pyramidal
B)  trigonal
C)  tetrahedral
D)  linear
E)  bentF) A) and D)
G) A) and E) E

Question 17

Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory.
(N is the central atom. )

Accepted Answer

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

Question 18

Select the best Lewis structure for P2I4. 2I4.   A) a B) b C) c D) d E) None of these structures is suitable for P2I4." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  None of these structures is suitable for P2I4.F) B) and D)
G) C) and D) A

Question 19

Draw Lewis structures which obey the octet rule,for the following atoms,molecules and ions,showing all valence electrons.Central atoms are shown in bold.
a.NH3
 b.O3 (Hint: O3 is not cyclic)
c.HCN
d.SO3

Accepted Answer

Question 20

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

Accepted Answer

A)  linear
B)  trigonal planar
C)  V-shaped
D)  tetrahedral
E)  trigonal pyramidalF) A) and B)
G) A) and C)

Exam 10: The Shapes of Molecules

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

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

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

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

Correct AnswerverifiedA

Explain what is meant by "dipole moment",and give an example of a molecule which has polar bonds but which does not itself have a dipole moment.

Correct AnswerverifiedA dipole moment arises in a molecule whe...View AnswerShow Answer

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

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

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

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Select the correct Lewis structure for nitrogen trifluoride,NF3.

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

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

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

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

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

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

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

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Predict the ideal bond angles around nitrogen in N2F2 using the molecular shape given by the VSEPR theory. (N is the central atom. )

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Select the best Lewis structure for P2I4.

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Draw Lewis structures which obey the octet rule,for the following atoms,molecules and ions,showing all valence electrons.Central atoms are shown in bold. a.NH3 b.O3 (Hint: O3 is not cyclic) c.HCN d.SO3

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

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

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

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

Correct Answer
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A

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A dipole moment arises in a molecule whe...
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Predict the ideal bond angles in IF₂^- using the molecular shape given by the VSEPR theory.

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Select the correct Lewis structure for nitrogen trifluoride,NF₃.

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

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

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

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

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Predict the ideal bond angles around nitrogen in N₂F₂ using the molecular shape given by the VSEPR theory. (N is the central atom. )

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Select the best Lewis structure for P₂I₄.

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A

Draw Lewis structures which obey the octet rule,for the following atoms,molecules and ions,showing all valence electrons.Central atoms are shown in bold. a.NH₃ b.O₃ (Hint: O₃ is not cyclic) c.HCN d.SO₃

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

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