Question 1

Which is the correct molecular orbital diagram for O2- ion?

Accepted Answer

A)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓ σ2p ↑ ↓ π2p* ↑ ↓, ↑ 
B)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓ σ2p ↑ ↓ π2p* ↑ ↑, ↑ 
C)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓, ↑ ↓ σ2p ↑ π2p* ↑ ↓ 
D)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓, ↑ ↓ σ2p ↑ ↓ π2p* ↑ 
E)  σ 2s ↑ ↓ σ 2s* ↑ π2p ↑ ↓, ↑ ↓, ↑ ↓ σ2p ↑ ↓ π2p* ↑ 
A)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓ σ2p ↑ ↓ π2p* ↑ ↓, ↑ 
B)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓ σ2p ↑ ↓ π2p* ↑ ↑, ↑ 
C)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓, ↑ ↓ σ2p ↑ π2p* ↑ ↓ 
D)  σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓, ↑ ↓ σ2p ↑ ↓ π2p* ↑ 
E)  σ 2s ↑ ↓ σ 2s* ↑ π2p ↑ ↓, ↑ ↓, ↑ ↓ σ2p ↑ ↓ π2p* ↑

Question 2

Choose the INCORRECT statement about NH2-.

Accepted Answer

A)  There are no π bonds. 
B)  There are two σ bonds. 
C)  N is sp3 hybridization. 
D)  The molecule is bent. 
E)  There is one lone pair on N. 
A)  There are no π bonds. 
B)  There are two σ bonds. 
C)  N is sp3 hybridization. 
D)  The molecule is bent. 
E)  There is one lone pair on N.

Question 3

Which of the following is INCORRECT about silicon doped with phosphorus?

Accepted Answer

A)  It would form a p-type semiconductor. 
B)  Phosphorus is a donor atom. 
C)  Phosphorus has five valence electrons. 
D)  Each phosphorus is bonded to four neighboring silicon atoms. 
E)  The extra phosphorus electron is promoted to the conduction band. 
A)  It would form a p-type semiconductor. 
B)  Phosphorus is a donor atom. 
C)  Phosphorus has five valence electrons. 
D)  Each phosphorus is bonded to four neighboring silicon atoms. 
E)  The extra phosphorus electron is promoted to the conduction band.

Question 4

According to Molecular Orbital (MO) theory, which statement below is true?

Accepted Answer

A)  A molecule with an even number of electrons must be diamagnetic. 
B)  There are as many sigma bonds as pi bonds in a molecule. 
C)  There are as many molecular orbitals as there are atomic orbitals. 
D)  There are as many bonding as antibonding electrons in a molecule. 
E)  All molecules contain pi bonds. 
A)  A molecule with an even number of electrons must be diamagnetic. 
B)  There are as many sigma bonds as pi bonds in a molecule. 
C)  There are as many molecular orbitals as there are atomic orbitals. 
D)  There are as many bonding as antibonding electrons in a molecule. 
E)  All molecules contain pi bonds.

Question 5

A pi bond is:

Accepted Answer

A)  formed from two s orbitals 
B)  formed from two p orbitals 
C)  formed from hybridized orbitals 
D)  formed from one s and one p orbital 
E)  stronger than a sigma bond 
A)  formed from two s orbitals 
B)  formed from two p orbitals 
C)  formed from hybridized orbitals 
D)  formed from one s and one p orbital 
E)  stronger than a sigma bond

Question 6

Which statement is correct for the structure shown?

Accepted Answer

A)  The molecule contains a total of 16 σ bonds. 
B)  Carbon no. 1 is described by sp hybridization. 
C)  The molecule contains a total of four π bonds. 
D)  Carbon no. 3 is described by sp3 hybridization. 
E)  The molecule contains a delocalized π bond system. 
A)  The molecule contains a total of 16 σ bonds. 
B)  Carbon no. 1 is described by sp hybridization. 
C)  The molecule contains a total of four π bonds. 
D)  Carbon no. 3 is described by sp3 hybridization. 
E)  The molecule contains a delocalized π bond system.

Question 7

The inclusion of a small amount of phosphorus in a crystal of pure germanium yields what kind of semiconductor?

Accepted Answer

A)  an insulator 
B)  an amorphous solid 
C)  n-type, in which extra electrons carry the current 
D)  p-type, in which a deficiency of electrons carries the current 
E)  p-n-p type 
A)  an insulator 
B)  an amorphous solid 
C)  n-type, in which extra electrons carry the current 
D)  p-type, in which a deficiency of electrons carries the current 
E)  p-n-p type

Question 8

The concept of an anti-bonding orbital is unique to the:

Accepted Answer

A)  theory of bond hybridization 
B)  valence bond theory 
C)  molecular orbital theory 
D)  concept of resonance 
E)  electrostatic repulsion theory 
A)  theory of bond hybridization 
B)  valence bond theory 
C)  molecular orbital theory 
D)  concept of resonance 
E)  electrostatic repulsion theory

Question 9

If the wave functions describing the 2s and two of the 2p orbitals are combined, the identical orbitals derived form bond angles of ________.

Accepted Answer

A)  90° 
B)  120° 
C)  180° 
D)  109.5° 
E)  360° 
A)  90° 
B)  120° 
C)  180° 
D)  109.5° 
E)  360°

Question 10

According to the valence bond theory, in the ion NH4+, nitrogen is using which orbitals for bonding?

Accepted Answer

A)  sp3 
B)  p 
C)  sp2d 
D)  sp 
E)  s 
A)  sp3 
B)  p 
C)  sp2d 
D)  sp 
E)  s

Question 11

One resonance structure of N2O is   The hybridized atomic orbitals of the central nitrogen atom which are consistent with this structure are ________.

Accepted Answer

A)  four sp3 orbitals 
B)  three sp2 orbitals and a p orbital 
C)  two sp2 orbitals and two sp orbitals 
D)  two sp orbitals and two p orbitals 
E)  one sp orbital and two p orbitals 
A)  four sp3 orbitals 
B)  three sp2 orbitals and a p orbital 
C)  two sp2 orbitals and two sp orbitals 
D)  two sp orbitals and two p orbitals 
E)  one sp orbital and two p orbitals

Question 12

The geometry of sp2 hybridized orbitals is ________.

Accepted Answer

A)  linear 
B)  tetrahedral 
C)  trigonal planar 
D)  octahedral 
E)  T-shaped 
A)  linear 
B)  tetrahedral 
C)  trigonal planar 
D)  octahedral 
E)  T-shaped

Question 13

The hybridization on Xe in XeF4 is ________.

Accepted Answer

A)  not hybridized 
B)  sp3 
C)  sp3d 
D)  sp3d2 
E)  sp2d 
A)  not hybridized 
B)  sp3 
C)  sp3d 
D)  sp3d2 
E)  sp2d

Question 14

How many σ- and π-bonds, respectively, are there in phenylisothiocyanate, C6H5NCS? Ignore the C-H bonds in your counting.

Accepted Answer

A)  9 and 5 
B)  8 and 4 
C)  5 and 5 
D)  9 and 2 
A)  9 and 5 
B)  8 and 4 
C)  5 and 5 
D)  9 and 2

Question 15

Which of the following statements concerning the relative energy levels of molecular orbitals for the O2 molecule is INCORRECT?

Accepted Answer

A)  σ1s < σ1s* 
B)  σ2s < σ2p 
C)  π2p < σ2p 
D)  π2p* < σ2p* 
E)  σ1s* < σ2s 
A)  σ1s < σ1s* 
B)  σ2s < σ2p 
C)  π2p < σ2p 
D)  π2p* < σ2p* 
E)  σ1s* < σ2s

Question 16

According to the principles of VSEPR applied on ICl5, which of the following is INCORRECT?

Accepted Answer

A)  VSEPR formula = AX5E 
B)  molecular geometry = square pyramid 
C)  hybridization = sp3d 
D)  electron pair geometry = octahedral 
E)  one lone pair and 5 bonding pairs 
A)  VSEPR formula = AX5E 
B)  molecular geometry = square pyramid 
C)  hybridization = sp3d 
D)  electron pair geometry = octahedral 
E)  one lone pair and 5 bonding pairs

Question 17

π bonds:

Accepted Answer

A)  are the only kind of bonds present in double bonds 
B)  have very little electron density along the internuclear axis 
C)  are formed by endwise overlap of p orbits 
D)  are formed from hybrid orbitals 
E)  are formed from s orbitals 
A)  are the only kind of bonds present in double bonds 
B)  have very little electron density along the internuclear axis 
C)  are formed by endwise overlap of p orbits 
D)  are formed from hybrid orbitals 
E)  are formed from s orbitals

Question 18

Choose the INCORRECT statement about NO2+.

Accepted Answer

A)  There is one π bond. 
B)  There are two σ bonds. 
C)  The hybridization is sp. 
D)  There are no lone pairs on N. 
E)  There are two lone pairs on each O. 
A)  There is one π bond. 
B)  There are two σ bonds. 
C)  The hybridization is sp. 
D)  There are no lone pairs on N. 
E)  There are two lone pairs on each O.

Question 19

According to the molecular orbital (MO) theory, when two oxygen atoms bond together, their 2p orbitals combine to form:

Accepted Answer

A)  two sigma molecular orbitals (MOs) and four pi MOs 
B)  two sigma MOs and two pi MOs 
C)  four pi MOs only 
D)  one sigma and one pi MO 
E)  a delocalized set of MO 
A)  two sigma molecular orbitals (MOs) and four pi MOs 
B)  two sigma MOs and two pi MOs 
C)  four pi MOs only 
D)  one sigma and one pi MO 
E)  a delocalized set of MO

Question 20

The hybridization of N in NO2- is ________.

Accepted Answer

A)  sp 
B)  sp2 
C)  spd 
D)  sp3 
E)  dsp 
A)  sp 
B)  sp2 
C)  spd 
D)  sp3 
E)  dsp

Exam 11: Chemical Bonding II: Additional Aspects

Which is the correct molecular orbital diagram for O2- ion?

Choose the INCORRECT statement about NH2-.

Which of the following is INCORRECT about silicon doped with phosphorus?

According to Molecular Orbital (MO) theory, which statement below is true?

A pi bond is:

Which statement is correct for the structure shown?

The inclusion of a small amount of phosphorus in a crystal of pure germanium yields what kind of semiconductor?

The concept of an anti-bonding orbital is unique to the:

If the wave functions describing the 2s and two of the 2p orbitals are combined, the identical orbitals derived form bond angles of ________.

According to the valence bond theory, in the ion NH4+, nitrogen is using which orbitals for bonding?

One resonance structure of N2O is The hybridized atomic orbitals of the central nitrogen atom which are consistent with this structure are ________.

The geometry of sp2 hybridized orbitals is ________.

The hybridization on Xe in XeF4 is ________.

How many σ- and π-bonds, respectively, are there in phenylisothiocyanate, C6H5NCS? Ignore the C-H bonds in your counting.

Which of the following statements concerning the relative energy levels of molecular orbitals for the O2 molecule is INCORRECT?

According to the principles of VSEPR applied on ICl5, which of the following is INCORRECT?

π bonds:

Choose the INCORRECT statement about NO2+.

According to the molecular orbital (MO) theory, when two oxygen atoms bond together, their 2p orbitals combine to form:

The hybridization of N in NO2- is ________.

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

Which is the correct molecular orbital diagram for O₂^-ion?

Choose the INCORRECT statement about NH₂^-.

According to the valence bond theory, in the ion NH₄⁺, nitrogen is using which orbitals for bonding?

One resonance structure of N₂O is The hybridized atomic orbitals of the central nitrogen atom which are consistent with this structure are ________.

How many σ- and π-bonds, respectively, are there in phenylisothiocyanate, C₆H₅NCS? Ignore the C-H bonds in your counting.

Which of the following statements concerning the relative energy levels of molecular orbitals for the O₂molecule is INCORRECT?

Choose the INCORRECT statement about NO₂⁺.

The hybridization of N in NO₂^- is ________.