Question 1

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 2

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

Accepted Answer

A) σ1s 1s*  
B) σ2s 2p  
C) π2p 2p  
D) π2p* 2p*  
E) σ1s* 2s  
A) σ1s 1s*  
B) σ2s 2p  
C) π2p 2p  
D) π2p* 2p*  
E) σ1s* 2s

Question 3

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 4

The hybridization of N in NO2- is ________.

Accepted Answer

A) sp 
B) sp2  
C) sp3d  
D) sp3  
E) sp3d2 
A) sp 
B) sp2  
C) sp3d  
D) sp3  
E) sp3d2

Question 5

The structure of aspirin is given below.(Note that lone pairs of electrons are not shown. )  
Which set of hybrid orbitals best describes the O-C bond,labeled "a," "b," in aspirin?

Accepted Answer

A) sp3-sp2 
B) sp3-sp3 
C) sp2-sp2 
D) sp-sp2 
A) sp3-sp2 
B) sp3-sp3 
C) sp2-sp2 
D) sp-sp2

Question 6

What is the molecular geometry of TeCl4?

Accepted Answer

A) seesaw 
B) square planar 
C) square pyramidal 
D) tetrahedral 
A) seesaw 
B) square planar 
C) square pyramidal 
D) tetrahedral

Question 7

Which is the correct molecular orbital diagram for carbon monoxide?

Accepted Answer

A) (σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓,↑ ↓ σ2p ↑ ↓) 
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* ↑ ↓ π2pp ↑ ↓,↑ ↓ π2p* ↑ ↓) 
A) (σ 2s ↑ ↓ σ 2s* ↑ ↓ π2p ↑ ↓,↑ ↓ σ2p ↑ ↓) 
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* ↑ ↓ π2pp ↑ ↓,↑ ↓ π2p* ↑ ↓)

Question 8

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

Accepted Answer

A) The B.O.is 1/2. 
B) There are no unpaired electrons. 
C) The σ1s* orbital has one electron. 
D) The molecule is paramagnetic. 
E) There are 3 electrons in the molecular orbitals. 
A) The B.O.is 1/2. 
B) There are no unpaired electrons. 
C) The σ1s* orbital has one electron. 
D) The molecule is paramagnetic. 
E) There are 3 electrons in the molecular orbitals.

Question 9

Three of the molecular shapes which a sp3d hybridized molecule can have are:

Accepted Answer

A) triangular,trigonal bipyramid,linear 
B) linear,square planar,T-shaped 
C) irregular tetrahedron,T-shaped,bent 
D) T-shaped,linear,trigonal bipyramid 
E) linear,tetragonal pyramid,octahedral 
A) triangular,trigonal bipyramid,linear 
B) linear,square planar,T-shaped 
C) irregular tetrahedron,T-shaped,bent 
D) T-shaped,linear,trigonal bipyramid 
E) linear,tetragonal pyramid,octahedral

Question 10

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 11

The VSEPR model predicts the H-O-H bond angle in H3O+ to be:

Accepted Answer

A) 60° 
B) 90° 
C) less than 109.5° but greater than 90° 
D) 109.5° 
A) 60° 
B) 90° 
C) less than 109.5° but greater than 90° 
D) 109.5°

Question 12

What is the hybridization of the Xe atom in XeF2?

Accepted Answer

A) sp3d 
B) sp 
C) sp3 
D) sp2 
A) sp3d 
B) sp 
C) sp3 
D) sp2

Question 13

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

Accepted Answer

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

Question 14

Which of the following statements concerning molecular orbital (MO)theory is FALSE?

Accepted Answer

A) The number of MOs formed equals the number of atomic orbitals combined. 
B) Any set of MOs from 2 atomic orbitals involves 1 bonding and 1 antibonding orbital. 
C) Electrons normally enter the lowest energy MO available to them. 
D) No more than two electrons can enter a particular MO. 
E) Electrons enter MOs of identical energies in pairs before any enter singly. 
A) The number of MOs formed equals the number of atomic orbitals combined. 
B) Any set of MOs from 2 atomic orbitals involves 1 bonding and 1 antibonding orbital. 
C) Electrons normally enter the lowest energy MO available to them. 
D) No more than two electrons can enter a particular MO. 
E) Electrons enter MOs of identical energies in pairs before any enter singly.

Question 15

How many π-electrons are there in S2O where S is the central atom?

Accepted Answer

A) 4 
B) 2 
C) 6 
D) 0 
A) 4 
B) 2 
C) 6 
D) 0

Question 16

Which of the following involves delocalized π bonds?

Accepted Answer

A) acetylene (C2H2) 
B) benzene (C6H6) 
C) carbon tetrachloride (CCl4) 
D) dichlorodifluoromethane (CF2Cl2) 
E) ethylene (C2H4) 
A) acetylene (C2H2) 
B) benzene (C6H6) 
C) carbon tetrachloride (CCl4) 
D) dichlorodifluoromethane (CF2Cl2) 
E) ethylene (C2H4)

Question 17

Which statement is correct for the structure shown?

Accepted Answer

A) Carbon no.1 is described by sp3 hybridization. 
B) The molecule contains 19 σ bonds. 
C) Carbon no.2 is described by sp2 hybridization. 
D) The molecule contains a total of five π bonds. 
E) Carbon no.7 is described by sp hybridization. 
A) Carbon no.1 is described by sp3 hybridization. 
B) The molecule contains 19 σ bonds. 
C) Carbon no.2 is described by sp2 hybridization. 
D) The molecule contains a total of five π bonds. 
E) Carbon no.7 is described by sp hybridization.

Question 18

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 19

Choose the INCORRECT statement about HCN.

Accepted Answer

A) There are two π bonds. 
B) There are two σ bonds. 
C) N has a lone pair. 
D) The molecule is bent. 
E) C has sp hybridization. 
A) There are two π bonds. 
B) There are two σ bonds. 
C) N has a lone pair. 
D) The molecule is bent. 
E) C has sp hybridization.

Question 20

The HCOO- ion can be described by using delocalized electrons.What is the hybridization of the C atom?

Accepted Answer

A) sp 
B) sp3  
C) sp2d 
D) sp3d  
E) sp2  
A) sp 
B) sp3  
C) sp2d 
D) sp3d  
E) sp2

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

Choose the INCORRECT statement about NH2-

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

π bonds:

The hybridization of N in NO2- is ________.

The structure of aspirin is given below.(Note that lone pairs of electrons are not shown. ) Which set of hybrid orbitals best describes the O-C bond,labeled "a," "b," in aspirin?

What is the molecular geometry of TeCl4?

Which is the correct molecular orbital diagram for carbon monoxide?

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

Three of the molecular shapes which a sp3d hybridized molecule can have are:

The hybridization on Xe in XeF4 is ________.

The VSEPR model predicts the H-O-H bond angle in H3O+ to be:

What is the hybridization of the Xe atom in XeF2?

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

Which of the following statements concerning molecular orbital (MO)theory is FALSE?

How many π-electrons are there in S2O where S is the central atom?

Which of the following involves delocalized π bonds?

Which statement is correct for the structure shown?

According to molecular orbital (MO)theory,which statement below is true?

Choose the INCORRECT statement about HCN.

The HCOO- ion can be described by using delocalized electrons.What is the hybridization of the C atom?

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

Choose the INCORRECT statement about NH₂^-

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

The hybridization of N in NO₂^- is ________.

What is the molecular geometry of TeCl₄?

Three of the molecular shapes which a sp³^d hybridized molecule can have are:

The hybridization on Xe in XeF₄ is ________.

The VSEPR model predicts the H-O-H bond angle in H₃O⁺ to be:

What is the hybridization of the Xe atom in XeF₂?

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

How many π-electrons are there in S₂O where S is the central atom?

The HCOO^- ion can be described by using delocalized electrons.What is the hybridization of the C atom?