Question 1

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

Accepted Answer

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

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.

Question 3

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

Question 4

The hybridization of N in NO2- is ________.

Accepted Answer

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

Question 5

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.

Question 6

The structure of aspirin is given below.(Note that lone pairs of electrons are not shown. )  3-sp2 B) sp3-sp3 C) sp2-sp2 D) sp-sp2" class="answers-bank-image d-inline" rel="preload" >
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

Question 7

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* ↑)

Question 8

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.

Question 9

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°

Question 10

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

Question 11

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

Question 12

According to MO theory,which is an INCORRECT statement for 1s* orbital has one electron. D) The molecule is paramagnetic. E) There are 3 electrons in the molecular orbitals." class="answers-bank-image d-inline" rel="preload" >?

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.

Question 13

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)

Question 14

The hybridization on Xe in XeF4 is ________.

Accepted Answer

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

Question 15

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* ↑ ↓)

Question 16

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.

Question 17

What is the hybridization of the Xe atom in XeF2?

Accepted Answer

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

Question 18

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

Question 19

What is the molecular geometry of TeCl4?

Accepted Answer

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

Question 20

Which statement is correct for the structure shown? 3 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." class="answers-bank-image d-inline" rel="preload" >

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.

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

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?

Correct AnswerverifiedShow Answer

Which is the correct molecular orbital diagram for carbon monoxide?

Correct AnswerverifiedShow Answer

Which statement is correct for the structure shown?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following involves delocalized π bonds?

Correct AnswerverifiedShow Answer

The hybridization of N in NO2- is ________.

Correct AnswerverifiedShow Answer

The hybridization on Xe in XeF4 is ________.

Correct AnswerverifiedShow Answer

What is the hybridization of the Xe atom in XeF2?

Correct AnswerverifiedShow Answer

π bonds:

Correct AnswerverifiedShow Answer

What is the molecular geometry of TeCl4?

Correct AnswerverifiedShow Answer

Choose the INCORRECT statement about NH2-

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Choose the INCORRECT statement about HCN.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The hybridization of N in NO₂^- is ________.

Correct Answer
verified

The hybridization on Xe in XeF₄ is ________.

Correct Answer
verified

What is the hybridization of the Xe atom in XeF₂?

Correct Answer
verified

Correct Answer
verified

What is the molecular geometry of TeCl₄?

Correct Answer
verified

Choose the INCORRECT statement about NH₂^-

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified