Question 1

Using the VSEPR model,the electron-group geometry of the central atom in CF4 is:

Accepted Answer

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

Question 2

What geometric arrangement of charge clouds is expected for an atom that has four charge clouds?

Accepted Answer

A) trigonal bipyramidal 
B) octahedral 
C) tetrahedral 
D) square planar 
A) trigonal bipyramidal 
B) octahedral 
C) tetrahedral 
D) square planar

Question 3

What is the molecular geometry of NCl3?

Accepted Answer

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

Question 4

Which hybrid orbitals are impossible in electrically neutral molecules containing only the elements shown?

Accepted Answer

A) sp3/Al and H 
B) sp2/B and F 
C) sp/C and H 
D) sp2/N and O 
E) sp3/O and F 
A) sp3/Al and H 
B) sp2/B and F 
C) sp/C and H 
D) sp2/N and O 
E) sp3/O and F

Question 5

Which of the following best describes ClF2-? It has a molecular geometry that is:

Accepted Answer

A) linear with no lone pairs on the Cl atom 
B) linear with lone pairs on the Cl atom 
C) nonlinear with no lone pairs on the Cl atom 
D) nonlinear with lone pairs on the Cl atom 
A) linear with no lone pairs on the Cl atom 
B) linear with lone pairs on the Cl atom 
C) nonlinear with no lone pairs on the Cl atom 
D) nonlinear with lone pairs on the Cl atom

Question 6

According to MO theory,which is the INCORRECT statement for  ?

Accepted Answer

A) The BO is 2.5. 
B) There is one unpaired electron. 
C) The σ2p orbital has one electron in it. 
D) The molecule is diamagnetic. 
E) There are 9 electrons in the molecular orbitals. 
A) The BO is 2.5. 
B) There is one unpaired electron. 
C) The σ2p orbital has one electron in it. 
D) The molecule is diamagnetic. 
E) There are 9 electrons in the molecular orbitals.

Question 7

The extra stability that a molecule gains due to electron delocalizations (the electrons being free to move throughout large parts of the molecule)is called:

Accepted Answer

A) ionization energy 
B) lattice energy 
C) covalent strength 
D) resonance energy 
E) bond energy 
A) ionization energy 
B) lattice energy 
C) covalent strength 
D) resonance energy 
E) bond energy

Question 8

Using the VSEPR model,the molecular geometry of the central atom in XeF4 is:

Accepted Answer

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

Question 9

Which of the following statements is INCORRECT?

Accepted Answer

A) A double bond is stronger than a single bond for the same atoms. 
B) A double bond is less than twice as strong as a single bond for the same atoms. 
C) Bonded atoms cannot rotate freely around a double bond. 
D) Molecular geometry depends on the σ bond framework. 
E) There are no hybridized orbitals in multiple bonds. 
A) A double bond is stronger than a single bond for the same atoms. 
B) A double bond is less than twice as strong as a single bond for the same atoms. 
C) Bonded atoms cannot rotate freely around a double bond. 
D) Molecular geometry depends on the σ bond framework. 
E) There are no hybridized orbitals in multiple bonds.

Question 10

Choose the INCORRECT statement about PCl5.

Accepted Answer

A) There are no π bonds. 
B) P has one lone pair. 
C) P has sp3d hybridization. 
D) Each Cl has 3 lone pairs. 
E) There are 5 σ bonds. 
A) There are no π bonds. 
B) P has one lone pair. 
C) P has sp3d hybridization. 
D) Each Cl has 3 lone pairs. 
E) There are 5 σ bonds.

Question 11

The hybrid orbital set used by the central atom in KrF2 is:

Accepted Answer

A) sp 
B)    
C)    
D)    d 
E)      
A) sp 
B)    
C)    
D)    d 
E)

Question 12

For XeF4,what are the dipole moment orientation,hybridization on the central atom,and the number of lone pairs,respectively,on the central atom?

Accepted Answer

A) none,sp3d2,two 
B) none,sp3,none 
C) away from one pair,sp3d,one 
D) toward one pair,sp3d,one 
E) toward Xe,sp3d2,one 
A) none,sp3d2,two 
B) none,sp3,none 
C) away from one pair,sp3d,one 
D) toward one pair,sp3d,one 
E) toward Xe,sp3d2,one

Question 13

Unhybridized p orbitals must be present for electron delocalization to occur.

Accepted Answer

A) True 
 B)False

Question 14

Using the VSEPR model,the molecular geometry of the central atom in NO3- is:

Accepted Answer

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

Question 15

Which of the pairs of molecules below have the same hybridization on the central atom? (The central atom is underlined in each molecule. )

Accepted Answer

A) CO2,CH4  
B) H2CO,BeH2  
C) BCl3,HNO 
D) H2O,HF 
E) NH3,HNO 
A) CO2,CH4  
B) H2CO,BeH2  
C) BCl3,HNO 
D) H2O,HF 
E) NH3,HNO

Question 16

Which statement is INCORRECT about molecular orbital theory?

Accepted Answer

A) The number of molecular orbitals produced is equal to the number of atomic orbitals combined. 
B) Each pair of sigma molecular orbitals is a bonding orbital and an antibonding orbital. 
C) The antibonding orbital is at a lower energy than the bonding orbital. 
D) The bond order (BO)is   . 
E) Hund's rule says that each orbital of identical energy has one electron before pairs are formed. 
A) The number of molecular orbitals produced is equal to the number of atomic orbitals combined. 
B) Each pair of sigma molecular orbitals is a bonding orbital and an antibonding orbital. 
C) The antibonding orbital is at a lower energy than the bonding orbital. 
D) The bond order (BO)is   . 
E) Hund's rule says that each orbital of identical energy has one electron before pairs are formed.

Question 17

Using the VSEPR model,the molecular geometry of the central atom in NH4+ is:

Accepted Answer

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

Question 18

What is the hybridization of the S atom in SF4?

Accepted Answer

A) sp3d 
B) sp3 
C) sp3d2 
D) spd2 
A) sp3d 
B) sp3 
C) sp3d2 
D) spd2

Question 19

For BeCl2,the dipole moment of the molecule,hybridization on the central atom,and number of lone pairs on the central atom,respectively,are:

Accepted Answer

A) toward Be,sp2,none 
B) away from Be,sp2,one 
C) none,sp,none 
D) toward Be,sp,one 
E) none,sp3,two 
A) toward Be,sp2,none 
B) away from Be,sp2,one 
C) none,sp,none 
D) toward Be,sp,one 
E) none,sp3,two

Question 20

Choose the INCORRECT statement about H3O+.

Accepted Answer

A) There is one π bond. 
B) There are 3 σ bonds. 
C) There is one lone pair of electrons on O. 
D) The hybridization on O is sp3. 
E) The OH bonds are O(sp3)- H(1s). 
A) There is one π bond. 
B) There are 3 σ bonds. 
C) There is one lone pair of electrons on O. 
D) The hybridization on O is sp3. 
E) The OH bonds are O(sp3)- H(1s).

Exam 11: Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Using the VSEPR model,the electron-group geometry of the central atom in CF4 is:

What geometric arrangement of charge clouds is expected for an atom that has four charge clouds?

What is the molecular geometry of NCl3?

Which hybrid orbitals are impossible in electrically neutral molecules containing only the elements shown?

Which of the following best describes ClF2-? It has a molecular geometry that is:

According to MO theory,which is the INCORRECT statement for ?

The extra stability that a molecule gains due to electron delocalizations (the electrons being free to move throughout large parts of the molecule)is called:

Using the VSEPR model,the molecular geometry of the central atom in XeF4 is:

Which of the following statements is INCORRECT?

Choose the INCORRECT statement about PCl5.

The hybrid orbital set used by the central atom in KrF2 is:

For XeF4,what are the dipole moment orientation,hybridization on the central atom,and the number of lone pairs,respectively,on the central atom?

Unhybridized p orbitals must be present for electron delocalization to occur.

Using the VSEPR model,the molecular geometry of the central atom in NO3- is:

Which of the pairs of molecules below have the same hybridization on the central atom? (The central atom is underlined in each molecule. )

Which statement is INCORRECT about molecular orbital theory?

Using the VSEPR model,the molecular geometry of the central atom in NH4+ is:

What is the hybridization of the S atom in SF4?

For BeCl2,the dipole moment of the molecule,hybridization on the central atom,and number of lone pairs on the central atom,respectively,are:

Choose the INCORRECT statement about H3O+.

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

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

Using the VSEPR model,the electron-group geometry of the central atom in CF_{4 is:}

What is the molecular geometry of NCl₃?

Which of the following best describes ClF₂^-? It has a molecular geometry that is:

Using the VSEPR model,the molecular geometry of the central atom in XeF₄ is:

Choose the INCORRECT statement about PCl₅.

The hybrid orbital set used by the central atom in KrF₂ is:

For XeF₄,what are the dipole moment orientation,hybridization on the central atom,and the number of lone pairs,respectively,on the central atom?

Using the VSEPR model,the molecular geometry of the central atom in NO₃^- is:

Using the VSEPR model,the molecular geometry of the central atom in NH₄^{+ is:}

What is the hybridization of the S atom in SF₄?

For BeCl₂,the dipole moment of the molecule,hybridization on the central atom,and number of lone pairs on the central atom,respectively,are:

Choose the INCORRECT statement about H₃O⁺.