Question 1

Which of the following complexes shows geometric isomerism?

Accepted Answer

A)  K[Co(H2O)2Cl4] 
B)  [Co(H2O)5Cl]Cl2 
C)  [Co(H2O)5Cl]SO4 
D)  Na3[CoCl6] 
E)  [Co(H2O)6]Cl3 
A)  K[Co(H2O)2Cl4] 
B)  [Co(H2O)5Cl]Cl2 
C)  [Co(H2O)5Cl]SO4 
D)  Na3[CoCl6] 
E)  [Co(H2O)6]Cl3

Question 2

What is the maximum oxidation state of chromium?

Accepted Answer

A)  +4 
B)  +6 
C)  +3 
D)  +5 
E)  none of these 
A)  +4 
B)  +6 
C)  +3 
D)  +5 
E)  none of these

Question 3

A certain complex ion has a distorted octahedral structure in which the ligands along the plus and minus z axes are compressed (pushed in closer to the central metal ion). The d orbital splitting diagram for this complex ion would be

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 4

Here are some crystal field representations of d electrons in an octahedral field: Choose the representation that fits the transition metal atom in the following species.
-[Cr(NH3)5Cl]SO4

Accepted Answer

A)    
B)    
C)   
D)   
E)   
A)    
B)    
C)   
D)   
E)

Question 5

Which of the following complexes would be diamagnetic (all electrons paired)?

Accepted Answer

A)  Co(CN)6]3- 
B)  Mn(CN)6]4- 
C)  V(CN)6]3- 
D)  [Cr(CN)6]3- 
A)  Co(CN)6]3- 
B)  Mn(CN)6]4- 
C)  V(CN)6]3- 
D)  [Cr(CN)6]3-

Question 6

Specify the number of unpaired electrons in Co(en) 33+ (strong field).

Accepted Answer

A)  0 
B)  1 
C)  4 
D)  5 
E)  2 
A)  0 
B)  1 
C)  4 
D)  5 
E)  2

Question 7

Explain the toxicities of carbon monoxide (CO) and the cyanide ion (CN-).

Accepted Answer

See Sectio

Question 8

The complex ion [TiBr4]2- is tetrahedral. How many unpaired electrons are there in the complex?

Accepted Answer

A)  4 
B)  1 
C)  2 
D)  3 
E)  0 
A)  4 
B)  1 
C)  2 
D)  3 
E)  0

Question 9

Specify the number of unpaired electrons in NiCl42- (tetrahedral).

Accepted Answer

A)  0 
B)  2 
C)  4 
D)  1 
E)  5 
A)  0 
B)  2 
C)  4 
D)  1 
E)  5

Question 10

Calculate the total number of unpaired electrons in the following complex ions: [Zn(H2O)6]2+, [NiCN4]2- (square planar), [Co(NH3)6]3+ (strong field).

Accepted Answer

A)  0 
B)  1 
C)  3 
D)  2 
E)  4 
A)  0 
B)  1 
C)  3 
D)  2 
E)  4

Question 11

Which of the following statements is true about coordination complexes?

Accepted Answer

A)  When the ligands approach a transition metal ion in an octahedral field, the dxz, dyz, and dxy atomic orbitals are affected the least by the ligands. 
B)  The metal is a Lewis base and the ligands are Lewis acids. 
C)  Only complexes with coordination number 6 are found in nature. 
D)  None of these is true. 
E)  All of these are true. 
A)  When the ligands approach a transition metal ion in an octahedral field, the dxz, dyz, and dxy atomic orbitals are affected the least by the ligands. 
B)  The metal is a Lewis base and the ligands are Lewis acids. 
C)  Only complexes with coordination number 6 are found in nature. 
D)  None of these is true. 
E)  All of these are true.

Question 12

Specify the number of unpaired electrons in [Mn(H2O)4]2+ (tetrahedral).

Accepted Answer

A)  2 
B)  1 
C)  4 
D)  5 
E)  0 
A)  2 
B)  1 
C)  4 
D)  5 
E)  0

Question 13

Specify the number of unpaired electrons in [CuCl2]-.

Accepted Answer

A)  3 
B)  5 
C)  4 
D)  2 
E)  0 
A)  3 
B)  5 
C)  4 
D)  2 
E)  0

Question 14

Analysis of the data from a titration indicates that a 0.1000-g sample of the complex contains 0.0708 g of py. Further analysis shows that 0.1000 g of the complex contains 0.0132 g of cobalt and 0.0160 g of chloride. What is the empirical formula of the complex?

Accepted Answer

A)  Co(py)6(Cl) (NO3) 
B)  Co(py)4(NO3)2 
C)  Co2(py)5(Cl)2(NO3)2 
D)  Co3(py)8(Cl)2(NO3)4 
E)  Co(py)4Cl2 
A)  Co(py)6(Cl) (NO3) 
B)  Co(py)4(NO3)2 
C)  Co2(py)5(Cl)2(NO3)2 
D)  Co3(py)8(Cl)2(NO3)4 
E)  Co(py)4Cl2

Question 15

Which of the following statements about the complex ion Co(en)2Cl2+ is true? (en = ethylenediamine, NH2CH2CH2NH2)

Accepted Answer

A)  The geometric isomers of the complex ion have identical chemical properties. 
B)  The complex ion exhibits two geometric isomers (cis and trans) and two optical isomers. 
C)  Because en is a strong field ligand (large F1F1F1S1F1F1F10), the complex ion is paramagnetic. 
D)  The complex ion exhibits cis and trans geometric isomers, but no optical isomers. 
E)  The complex ion contains Co(I). 
A)  The geometric isomers of the complex ion have identical chemical properties. 
B)  The complex ion exhibits two geometric isomers (cis and trans) and two optical isomers. 
C)  Because en is a strong field ligand (large F1F1F1S1F1F1F10), the complex ion is paramagnetic. 
D)  The complex ion exhibits cis and trans geometric isomers, but no optical isomers. 
E)  The complex ion contains Co(I).

Question 16

Addition of AgNO3 to aqueous solutions of the complex results in a cloudy white precipitate, presumably AgCl. You dissolve 0.1000 g of the complex in H2O and perform a precipitation titration with 0.0500 M AgNO3 as the titrant. Using an electrode that is sensitive to [Ag+], you reach the endpoint after 9.00 mL of titrant is added. How many grams of chloride ion were present in the 0.1000-g sample?

Accepted Answer

A)  4.50 F1F1F1S1F1F1F10 10-4 g 
B)  1.77 F1F1F1S1F1F1F10 10-3 g 
C)  5.00 F1F1F1S1F1F1F10 10-3 g 
D)  1.60 F1F1F1S1F1F1F10 10-2 g 
E)  6.38 F1F1F1S1F1F1F10 10-2 g 
A)  4.50 F1F1F1S1F1F1F10 10-4 g 
B)  1.77 F1F1F1S1F1F1F10 10-3 g 
C)  5.00 F1F1F1S1F1F1F10 10-3 g 
D)  1.60 F1F1F1S1F1F1F10 10-2 g 
E)  6.38 F1F1F1S1F1F1F10 10-2 g

Question 17

In describing the bonding in coordination compounds Lewis proposed that ______ were acids and ______ were bases.

Accepted Answer

A)  electrons, metal ions 
B)  electron pairs, ligands 
C)  ligands, metal ions 
D)  metal ions, ligands 
E)  ligands, electron pairs 
A)  electrons, metal ions 
B)  electron pairs, ligands 
C)  ligands, metal ions 
D)  metal ions, ligands 
E)  ligands, electron pairs

Question 18

How many unpaired electrons are there in the complex ion [Co(NO3)6]4-? For this ion, the nitrate ligands produce a very strong crystal field.

Accepted Answer

A)  4 
B)  5 
C)  3 
D)  2 
E)  1 
A)  4 
B)  5 
C)  3 
D)  2 
E)  1

Question 19

According to crystal field theory, how many unpaired electrons are present in the complex ion [Zn(H2O)6]2+?

Accepted Answer

A)  2 
B)  3 
C)  4 
D)  1 
E)  0 
A)  2 
B)  3 
C)  4 
D)  1 
E)  0

Question 20

The complex ion Co(NH3)62+ (three unpaired electrons) is classified as

Accepted Answer

A)  There is no way to tell. 
B)  strong field. 
C)  weak field. 
A)  There is no way to tell. 
B)  strong field. 
C)  weak field.

Which of the following complexes shows geometric isomerism?

What is the maximum oxidation state of chromium?

A certain complex ion has a distorted octahedral structure in which the ligands along the plus and minus z axes are compressed (pushed in closer to the central metal ion). The d orbital splitting diagram for this complex ion would be

Here are some crystal field representations of d electrons in an octahedral field: Choose the representation that fits the transition metal atom in the following species. -[Cr(NH₃)₅Cl]SO₄

Which of the following complexes would be diamagnetic (all electrons paired)?

Specify the number of unpaired electrons in Co(en)₃³⁺ (strong field).

Explain the toxicities of carbon monoxide (CO) and the cyanide ion (CN^-).

The complex ion [TiBr₄]²^- is tetrahedral. How many unpaired electrons are there in the complex?

Specify the number of unpaired electrons in NiCl₄²^- (tetrahedral).

Calculate the total number of unpaired electrons in the following complex ions: [Zn(H₂O)₆]²⁺, [NiCN₄]²^- (square planar), [Co(NH₃)₆]³⁺ (strong field).

Which of the following statements is true about coordination complexes?

Specify the number of unpaired electrons in [Mn(H₂O)₄]²⁺ (tetrahedral).

Specify the number of unpaired electrons in [CuCl₂]^-.

Analysis of the data from a titration indicates that a 0.1000-g sample of the complex contains 0.0708 g of py. Further analysis shows that 0.1000 g of the complex contains 0.0132 g of cobalt and 0.0160 g of chloride. What is the empirical formula of the complex?

Which of the following statements about the complex ion Co(en)₂Cl₂⁺ is true? (en = ethylenediamine, NH₂CH₂CH₂NH₂)

In describing the bonding in coordination compounds Lewis proposed that were acids and were bases.

How many unpaired electrons are there in the complex ion [Co(NO₃)₆]⁴^-? For this ion, the nitrate ligands produce a very strong crystal field.

According to crystal field theory, how many unpaired electrons are present in the complex ion [Zn(H₂O)₆]²⁺?

The complex ion Co(NH₃)₆²⁺ (three unpaired electrons) is classified as

Atoms, Molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Chemical Equilibrium

Acids and Bases

Applications of Aqueous Equilibria

Energy, Enthalpy, and Thermochemistry

Spontaneity, Entropy, and Free Energy

Electrochemistry

Quantum Mechanics and Atomic Theory

Bonding: General Concepts

Covalent Bonding: Orbitals

Chemical Kinetics

Liquids and Solids

Properties of Solutions

The Representative Elements

The Nucleus: a Chemists View

Organic and Biochemical Molecules

Filters

Exam 19: Transition Metals and Coordination Chemistry

Which of the following complexes shows geometric isomerism?

What is the maximum oxidation state of chromium?

A certain complex ion has a distorted octahedral structure in which the ligands along the plus and minus z axes are compressed (pushed in closer to the central metal ion). The d orbital splitting diagram for this complex ion would be

Here are some crystal field representations of d electrons in an octahedral field: Choose the representation that fits the transition metal atom in the following species. -[Cr(NH3)5Cl]SO4

Which of the following complexes would be diamagnetic (all electrons paired)?

Specify the number of unpaired electrons in Co(en) 33+ (strong field).

Explain the toxicities of carbon monoxide (CO) and the cyanide ion (CN-).

The complex ion [TiBr4]2- is tetrahedral. How many unpaired electrons are there in the complex?

Specify the number of unpaired electrons in NiCl42- (tetrahedral).

Calculate the total number of unpaired electrons in the following complex ions: [Zn(H2O)6]2+, [NiCN4]2- (square planar), [Co(NH3)6]3+ (strong field).

Which of the following statements is true about coordination complexes?

Specify the number of unpaired electrons in [Mn(H2O)4]2+ (tetrahedral).

Specify the number of unpaired electrons in [CuCl2]-.

Analysis of the data from a titration indicates that a 0.1000-g sample of the complex contains 0.0708 g of py. Further analysis shows that 0.1000 g of the complex contains 0.0132 g of cobalt and 0.0160 g of chloride. What is the empirical formula of the complex?

Which of the following statements about the complex ion Co(en)2Cl2+ is true? (en = ethylenediamine, NH2CH2CH2NH2)

In describing the bonding in coordination compounds Lewis proposed that ______ were acids and ______ were bases.

How many unpaired electrons are there in the complex ion [Co(NO3)6]4-? For this ion, the nitrate ligands produce a very strong crystal field.

According to crystal field theory, how many unpaired electrons are present in the complex ion [Zn(H2O)6]2+?

The complex ion Co(NH3)62+ (three unpaired electrons) is classified as

Atoms, Molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Chemical Equilibrium

Acids and Bases

Applications of Aqueous Equilibria

Energy, Enthalpy, and Thermochemistry

Spontaneity, Entropy, and Free Energy

Electrochemistry

Quantum Mechanics and Atomic Theory

Bonding: General Concepts

Covalent Bonding: Orbitals

Chemical Kinetics

Liquids and Solids

Properties of Solutions

The Representative Elements

The Nucleus: a Chemists View

Organic and Biochemical Molecules

Filters

Here are some crystal field representations of d electrons in an octahedral field: Choose the representation that fits the transition metal atom in the following species. -[Cr(NH₃)₅Cl]SO₄

Specify the number of unpaired electrons in Co(en)₃³⁺ (strong field).

Explain the toxicities of carbon monoxide (CO) and the cyanide ion (CN^-).

The complex ion [TiBr₄]²^- is tetrahedral. How many unpaired electrons are there in the complex?

Specify the number of unpaired electrons in NiCl₄²^- (tetrahedral).

Calculate the total number of unpaired electrons in the following complex ions: [Zn(H₂O)₆]²⁺, [NiCN₄]²^- (square planar), [Co(NH₃)₆]³⁺ (strong field).

Specify the number of unpaired electrons in [Mn(H₂O)₄]²⁺ (tetrahedral).

Specify the number of unpaired electrons in [CuCl₂]^-.

Which of the following statements about the complex ion Co(en)₂Cl₂⁺ is true? (en = ethylenediamine, NH₂CH₂CH₂NH₂)

In describing the bonding in coordination compounds Lewis proposed that were acids and were bases.

How many unpaired electrons are there in the complex ion [Co(NO₃)₆]⁴^-? For this ion, the nitrate ligands produce a very strong crystal field.

According to crystal field theory, how many unpaired electrons are present in the complex ion [Zn(H₂O)₆]²⁺?

The complex ion Co(NH₃)₆²⁺ (three unpaired electrons) is classified as