Question 1

Choose the most likely pattern for the crystal field diagram for the complex trans-[Ni(NH3)2(CN)4]2-, where CN- produces a much stronger crystal field than does NH3.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 2

The complex ions of Zn2+ are all colorless. The most likely explanation for this is that

Accepted Answer

A)  Zn2+ exhibits "d orbital" splittings in its complexes such that they absorb all wavelengths in the visible region. 
B)  because Zn2+ is a d10 ion, it does not absorb visible light even though the "d orbital" splittings are correct for absorbing visible wavelengths. 
C)  Zn2+ is paramagnetic. 
D)  Zn2+ is not a transition metal ion. 
E)  None of these explanations could be correct.

Question 3

Which of the following coordination compounds will form a precipitate when treated with an aqueous solution of AgNO3?

Accepted Answer

A)  Na3[CrCl6] 
B)  [Cr(NH3)3Cl3] 
C)  Na3[Cr(CN)6] 
D)  [Cr(NH3)6]Cl3 
E)  all of these

Question 4

The 3d electrons in Co(NH₃)₆³⁺ are all paired, but Fe(H₂O)₆²⁺ has unpaired electrons (is paramagnetic). Explain.

Accepted Answer

The answer of The 3d electrons in Co(NH₃)₆³⁺ are all...

Question 5

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.
-K4Fe(CN)6

Accepted Answer

A)   
B)   
C)  
D)  
E)

Question 6

How many unpaired electrons are found in Mn(NH3)43+ (tetrahedral)?

Accepted Answer

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

Question 7

Which of the following are structural isomers? 
I.Coordination isomers
II.Linkage isomers
III.Geometric isomers
IV.Optical isomers

Accepted Answer

A)  II, IV 
B)  II, III 
C)  I, II 
D)  I, III, IV 
E)  I, III

Question 8

The complex ion Fe(CN)64- (no unpaired electrons) is classified as

Accepted Answer

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

Question 9

Use the crystal field model to explain why solutions with Ag⁺ are colorless..

Accepted Answer

The answer of Use the crystal field model to explain...

Question 10

How many unpaired electrons are there in Ir(Br)64-? (Br- is a weak-field ligand.)

Accepted Answer

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

Question 11

Give the number of geometric isomers for the octahedral compound [Ma2B2C2], where A, B, and C represent ligands.

Accepted Answer

A)  2 
B)  1 
C)  3 
D)  5 
E)  none of these

Question 12

Which of the following is paramagnetic?

Accepted Answer

A)  [Co(en)6]3+ (strong field) 
B)  [Cu(en)3]+ 
C)  [Mn(CN)6]4- (strong field) 
D)  [Fe(en)3]2+ (strong field) 
E)  [Zn(H2O)6]2+

Question 13

Suppose you are studying coordination compounds of Co(II) with the ligand pyridine (py, CS1U1B15S1U1B0HS1U1B15S1U1B0N, molar mass = 79.10). You isolate a crystalline compound, and because the only available anions are ClS1U1P1-S1S1P0 and NOS1U1B13S1U1B0S1U1P1-S1S1P0, you hypothesize that the empirical formula of the coordination compound must be CoS1U1B1wS1U1B0(py)S1U1B1xS1U1B0(Cl)S1U1B1yS1U1B0(NOS1U1B13S1U1B0)S1U1B1zS1U1B0.
-You analyze for pyridine (Kb is approximately 10-9) by dissolving 0.1000 g of the complex in 100 mL of H2O and titrating with a 0.01 M HCl solution. Which of the following indicators should be used to detect the endpoint? (Assume that the initial concentration of pyridine is approximately 0.01 M.)

Accepted Answer

A)  thymol blue, pH range of color change = 8.0-9.6 
B)  methyl red, pH range of color change = 4.8-6.0 
C)  bromophenol blue, pH range of color change = 3.0-4.6 
D)  bromothymol blue, pH range of color change = 6.0-7.6 
E)  alizarin yellow, pH range of color change = 10.1-12.0

Question 14

Which of the following statements is true of the crystal field model?

Accepted Answer

A)  The electrons are assumed to be localized. 
B)  The metal ion-ligand bonds are considered completely ionic. 
C)  The ligands are treated as negative point charges. 
D)  The interaction between metal ion and ligand is treated as a Lewis acid-base interaction. 
E)  None of these statements is true.

Question 15

How many unpaired electrons are found in MnCl42- (tetrahedral)?

Accepted Answer

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

Question 16

Which of the following crystal field diagrams is correct for Co(CN)64-, where CN- is a strong-field ligand?

Accepted Answer

A)   
B)   
C)   
D)   
E)  none of these

Question 17

How many unpaired electrons are found in Fe(en)32+ (strong field)?

Accepted Answer

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

Question 18

What is the electron configuration of the Co(II) ion?

Accepted Answer

A)  [Ar]3d6 
B)  [Ar]3d7 
C)  [Ar]4s23d5 
D)  [Ar]4s24d2 
E)  [Ar]4s23d7

Question 19

Which of the following transition metals is a component of vitamin B12?

Accepted Answer

A)  chromium 
B)  zinc 
C)  copper 
D)  manganese 
E)  cobalt

Question 20

In _________, the isomers contain the same atoms, but one or more bonds differ.

Accepted Answer

The answer of In _________, the isomers contain the same...

Exam 19: Transition Metals and Coordination Chemistry

Choose the most likely pattern for the crystal field diagram for the complex trans-[Ni(NH₃) ₂(CN) ₄]²^-, where CN^- produces a much stronger crystal field than does NH₃.

The complex ions of Zn²⁺ are all colorless. The most likely explanation for this is that

Which of the following coordination compounds will form a precipitate when treated with an aqueous solution of AgNO₃?

The 3d electrons in Co(NH₃)₆³⁺ are all paired, but Fe(H₂O)₆²⁺ has unpaired electrons (is paramagnetic). Explain.

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. -K₄Fe(CN) ₆

How many unpaired electrons are found in Mn(NH₃) ₄³⁺(tetrahedral) ?

Which of the following are structural isomers? I.Coordination isomers II.Linkage isomers III.Geometric isomers IV.Optical isomers

The complex ion Fe(CN) ₆⁴^- (no unpaired electrons) is classified as

Use the crystal field model to explain why solutions with Ag⁺ are colorless..

How many unpaired electrons are there in Ir(Br) ₆⁴^-? (Br^- is a weak-field ligand.)

Give the number of geometric isomers for the octahedral compound [Ma₂B₂C₂], where A, B, and C represent ligands.

Which of the following is paramagnetic?

Which of the following statements is true of the crystal field model?

How many unpaired electrons are found in MnCl₄²^-(tetrahedral) ?

Which of the following crystal field diagrams is correct for Co(CN) ₆⁴^-, where CN^- is a strong-field ligand?

How many unpaired electrons are found in Fe(en) ₃²⁺(strong field) ?

What is the electron configuration of the Co(II) ion?

Which of the following transition metals is a component of vitamin B₁₂?

In _________, the isomers contain the same atoms, but one or more bonds differ.

Exam 19: Transition Metals and Coordination Chemistry

Choose the most likely pattern for the crystal field diagram for the complex trans-[Ni(NH3) 2(CN) 4]2-, where CN- produces a much stronger crystal field than does NH3.

The complex ions of Zn2+ are all colorless. The most likely explanation for this is that

Which of the following coordination compounds will form a precipitate when treated with an aqueous solution of AgNO3?

The 3d electrons in Co(NH3)63+ are all paired, but Fe(H2O)62+ has unpaired electrons (is paramagnetic). Explain.

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. -K4Fe(CN) 6

How many unpaired electrons are found in Mn(NH3) 43+ (tetrahedral) ?

Which of the following are structural isomers? I.Coordination isomers II.Linkage isomers III.Geometric isomers IV.Optical isomers

The complex ion Fe(CN) 64- (no unpaired electrons) is classified as

Use the crystal field model to explain why solutions with Ag+ are colorless..

How many unpaired electrons are there in Ir(Br) 64-? (Br- is a weak-field ligand.)

Give the number of geometric isomers for the octahedral compound [Ma2B2C2], where A, B, and C represent ligands.

Which of the following is paramagnetic?

Which of the following statements is true of the crystal field model?

How many unpaired electrons are found in MnCl42- (tetrahedral) ?

Which of the following crystal field diagrams is correct for Co(CN) 64-, where CN- is a strong-field ligand?

How many unpaired electrons are found in Fe(en) 32+ (strong field) ?

What is the electron configuration of the Co(II) ion?

Which of the following transition metals is a component of vitamin B12?

In _________, the isomers contain the same atoms, but one or more bonds differ.

Choose the most likely pattern for the crystal field diagram for the complex trans-[Ni(NH₃) ₂(CN) ₄]²^-, where CN^- produces a much stronger crystal field than does NH₃.

The complex ions of Zn²⁺ are all colorless. The most likely explanation for this is that

Which of the following coordination compounds will form a precipitate when treated with an aqueous solution of AgNO₃?

The 3d electrons in Co(NH₃)₆³⁺ are all paired, but Fe(H₂O)₆²⁺ has unpaired electrons (is paramagnetic). Explain.

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. -K₄Fe(CN) ₆

How many unpaired electrons are found in Mn(NH₃) ₄³⁺(tetrahedral) ?

The complex ion Fe(CN) ₆⁴^- (no unpaired electrons) is classified as

Use the crystal field model to explain why solutions with Ag⁺ are colorless..

How many unpaired electrons are there in Ir(Br) ₆⁴^-? (Br^- is a weak-field ligand.)

Give the number of geometric isomers for the octahedral compound [Ma₂B₂C₂], where A, B, and C represent ligands.

How many unpaired electrons are found in MnCl₄²^-(tetrahedral) ?

Which of the following crystal field diagrams is correct for Co(CN) ₆⁴^-, where CN^- is a strong-field ligand?

How many unpaired electrons are found in Fe(en) ₃²⁺(strong field) ?

Which of the following transition metals is a component of vitamin B₁₂?