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)  NH 3
B)  NH 4 +
C)  I 2
D)  BH 4 −
E)  SF 6F) B) and D)
G) A) and C)

Question 2

Select the best Lewis structure for P2I4.

Accepted Answer

A)   2I4. 
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B)   2I4. 
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C)   2I4. 
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D)   2I4. 
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E)  None of these choices are correct.F) A) and B)
G) D) and E)

Question 3

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

Accepted Answer

A)   3 that minimizes formal charges. 
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C)   3 that minimizes formal charges. 
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D)   3 that minimizes formal charges. 
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E)   3 that minimizes formal charges. 
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G) A) and C) C

Question 4

Boron never achieves an octet in any of its compounds.

Accepted Answer

A) True 
 B)False

Question 5

How many resonance structures are possible for NO3−?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) B) and D)
G) B) and C)

Question 6

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

Accepted Answer

A)  CS 2
B)  H 2S
C)  CH 2Cl 2
D)  PH 3
E)  CH 2OF) All of the above
G) B) and C)

Question 7

In order for a noncyclic triatomic molecule to be bent, VSEPR theory requires that there must be two lone pairs on the central atom.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

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

Question 9

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

Accepted Answer

A)   
B)   
C)   
D)   
E)  None of these choices are correct.F) B) and E)
G) A) and B)

Question 10

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

Accepted Answer

A)  0; −3
B)  0; 5
C)  5; −3
D)  5; 5
E)  3; 5F) A) and E)
G) C) and E)

Question 11

Which one of the following molecules has a zero dipole moment?

Accepted Answer

A)  SO 2
B)  HCl
C)  CS 2
D)  CO
E)  Cl 2OF) All of the above
G) B) and E) C

Question 12

Which of the following molecules has a net dipole moment?

Accepted Answer

A)  BeCl 2
B)  SF 2
C)  KrF 2
D)  CO 2
E)  CCl 4F) A) and B)
G) B) and E)

Question 13

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

Accepted Answer

A)  Trigonal pyramidal
B)  Tetrahedral
C)  T-shaped
D)  See-saw
E)  Trigonal planarF) B) and C)
G) A) and E)

Question 14

The molecule AX2, where A and X are different elements, will have a dipole moment if the molecule is bent.

Accepted Answer

A) True 
 B)False

Question 15

All possible resonance structures contribute equally to the resonance hybrid.

Accepted Answer

A) True 
 B)False

Question 16

The Lewis structure of NO2 violates the octet rule.

Accepted Answer

A) True 
 B)False

Question 17

When resonance occurs, the bond lengths in a molecule fluctuate rapidly.

Accepted Answer

A) True 
 B)False

Question 18

Which one of the following molecules contains a double bond?

Accepted Answer

A)  N 2
B)  PCl 5
C)  CH 2O
D)  C 2H 2
E)  I 2F) A) and B)
G) A) and C)

Question 19

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

Accepted Answer

A)   2F2 that correctly minimizes formal charges. 
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G) C) and D)

Question 20

In the following Lewis structure for ClO3F, chlorine has a formal charge of __________ and an oxidation number of __________. 3F, 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" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  7; 7
B)  7; −1
C)  1; 1
D)  1; −1
E)  1; 7F) A) and C)
G) A) and B) E

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?

Correct AnswerverifiedShow Answer

Select the best Lewis structure for P2I4.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Boron never achieves an octet in any of its compounds.

Correct AnswerverifiedShow Answer

How many resonance structures are possible for NO3−?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In order for a noncyclic triatomic molecule to be bent, VSEPR theory requires that there must be two lone pairs on the central atom.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which one of the following molecules has a zero dipole moment?

Correct AnswerverifiedC

Which of the following molecules has a net dipole moment?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The molecule AX2, where A and X are different elements, will have a dipole moment if the molecule is bent.

Correct AnswerverifiedShow Answer

All possible resonance structures contribute equally to the resonance hybrid.

Correct AnswerverifiedShow Answer

The Lewis structure of NO2 violates the octet rule.

Correct AnswerverifiedShow Answer

When resonance occurs, the bond lengths in a molecule fluctuate rapidly.

Correct AnswerverifiedShow Answer

Which one of the following molecules contains a double bond?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedE

Correct Answer
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Select the best Lewis structure for P₂I₄.

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

Correct Answer
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C

Correct Answer
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How many resonance structures are possible for NO₃⁻?

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Predict the ideal bond angles in GeCl₄using the molecular shape given by the VSEPR theory.

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

Correct Answer
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Correct Answer
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C

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

Correct Answer
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The molecule AX₂, where A and X are different elements, will have a dipole moment if the molecule is bent.

Correct Answer
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Correct Answer
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The Lewis structure of NO₂ violates the octet rule.

Correct Answer
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Select the Lewis structure for XeO₂F₂that correctly minimizes formal charges.

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

Correct Answer
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E