Question 1

The phenomenon called __________ contraction is responsible for the great similarity in atomic size and chemistry of 4d and 5d elements.

Accepted Answer

A) transition 
B) coordination 
C) lanthanide 
D) isomeric 
E) none of these 
A) transition 
B) coordination 
C) lanthanide 
D) isomeric 
E) none of these

Question 2

Which metal is most widely used in the electrical systems of homes and factories?

Accepted Answer

A) copper 
B) silver 
C) gold 
D) tungsten 
E) titanium 
A) copper 
B) silver 
C) gold 
D) tungsten 
E) titanium

Question 3

CuCl2- (linear)

Accepted Answer

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

Question 4

When 6.3 moles of [Co(NH3)5Cl]Cl2 is dissolved in water,how many moles of ions are in solution?

Accepted Answer

A) 3.3 
B) 4.3 
C) 2.1 
D) 19 
E) 57 
A) 3.3 
B) 4.3 
C) 2.1 
D) 19 
E) 57

Question 5

CoF63- (weak field)

Accepted Answer

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

Question 6

Which of the following complexes can exhibit optical isomerism? (en = H2N-CH2-CH2-NH2 and is bidentate)

Accepted Answer

A) cis-Co(NH3)4Cl2 
B) trans-Co(en)2Br2 
C) cis-Co(en)2Cl2 
D) Co(NH3)3Cl3 
E) none of these 
A) cis-Co(NH3)4Cl2 
B) trans-Co(en)2Br2 
C) cis-Co(en)2Cl2 
D) Co(NH3)3Cl3 
E) none of these

Question 7

Which of the following transition metals are important to the U.S.economy and defense?

Accepted Answer

A) chromium and cobalt 
B) manganese 
C) platinum and palladium 
D) all of these 
E) A and B only 
A) chromium and cobalt 
B) manganese 
C) platinum and palladium 
D) all of these 
E) A and B only

Question 8

Calculate the total number of unpaired electrons in the following complex ions: Zn(OH2)62+,Ni(CN)42- (square planar),Co(NH3)63+ (strong field).

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

The electron configuration for Cr2+ is

Accepted Answer

A) [Ar] 4s23d4 
B) [Ar] 4s13d5 
C) [Ar] 3d4 
D) [Ar] 4s23d2 
E) none of these 
A) [Ar] 4s23d4 
B) [Ar] 4s13d5 
C) [Ar] 3d4 
D) [Ar] 4s23d2 
E) none of these

Question 12

What transition metal has the combination of toughness,stretchability,and resilience that makes it ideal for use in bicycle frames?

Accepted Answer

A) titanium 
B) platinum 
C) tungsten 
D) nickel 
E) aluminum 
A) titanium 
B) platinum 
C) tungsten 
D) nickel 
E) aluminum

Question 13

Which of the following crystal field diagrams is correct for Mn(CN)63- (CN- is a strong field ligand)?

Accepted Answer

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

Question 14

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

Question 15

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

Question 16

Which of the following statements is true about the octahedral complexes of Ni2+?

Accepted Answer

A) Both strong- and weak-field complexes are diamagnetic. 
B) The strong-field complex is diamagnetic and the weak-field complex is paramagnetic. 
C) The strong-field complex is paramagnetic and the weak-field complex is diamagnetic. 
D) Both strong- and weak-field complexes are paramagnetic. 
E) There are no octahedral complexes of Ni. 
A) Both strong- and weak-field complexes are diamagnetic. 
B) The strong-field complex is diamagnetic and the weak-field complex is paramagnetic. 
C) The strong-field complex is paramagnetic and the weak-field complex is diamagnetic. 
D) Both strong- and weak-field complexes are paramagnetic. 
E) There are no octahedral complexes of Ni.

Question 17

How many unpaired electrons are found in each of the following complex ions?
-FeCl42-

Accepted Answer

Question 18

The complex ion NiCl42- is tetrahedral.The number of unpaired electrons in the complex is:

Accepted Answer

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

Question 19

Consider the pseudo-octahedral complex of Cr3+ shown below,where A and B represent Lewis bases and where A produces a stronger crystal field than B.Draw an appropriate crystal field diagram for this complex (include the electrons).

Accepted Answer

________ @#IMG-DLM& ________ @#IMG-DLM& ________
________ @#IMG-DLM& @#IMG-DLM&

Question 20

NiCl42- (tetrahedral)

Accepted Answer

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

Exam 21: Transition Metals and Coordination Chemistry

The phenomenon called __________ contraction is responsible for the great similarity in atomic size and chemistry of 4d and 5d elements.

Which metal is most widely used in the electrical systems of homes and factories?

CuCl2- (linear)

When 6.3 moles of [Co(NH3)5Cl]Cl2 is dissolved in water,how many moles of ions are in solution?

CoF63- (weak field)

Which of the following complexes can exhibit optical isomerism? (en = H2N-CH2-CH2-NH2 and is bidentate)

Which of the following transition metals are important to the U.S.economy and defense?

Calculate the total number of unpaired electrons in the following complex ions: Zn(OH2)62+,Ni(CN)42- (square planar),Co(NH3)63+ (strong field).

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

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

The electron configuration for Cr2+ is

What transition metal has the combination of toughness,stretchability,and resilience that makes it ideal for use in bicycle frames?

Which of the following crystal field diagrams is correct for Mn(CN)63- (CN- is a strong field ligand)?

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

Which of the following statements is true about the octahedral complexes of Ni2+?

How many unpaired electrons are found in each of the following complex ions? -FeCl42-

The complex ion NiCl42- is tetrahedral.The number of unpaired electrons in the complex is:

Consider the pseudo-octahedral complex of Cr3+ shown below,where A and B represent Lewis bases and where A produces a stronger crystal field than B.Draw an appropriate crystal field diagram for this complex (include the electrons).

NiCl42- (tetrahedral)

Chemical Foundations

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Filters

CuCl₂^- (linear)

When 6.3 moles of [Co(NH₃)₅Cl]Cl₂ is dissolved in water,how many moles of ions are in solution?

CoF₆³^- (weak field)

Which of the following complexes can exhibit optical isomerism? (en = H₂N-CH₂-CH₂-NH₂ and is bidentate)

Calculate the total number of unpaired electrons in the following complex ions: Zn(OH₂)₆²⁺,Ni(CN)₄²^- (square planar),Co(NH₃)₆³⁺ (strong field).

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

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

The electron configuration for Cr²⁺ is

Which of the following crystal field diagrams is correct for Mn(CN)₆³^- (CN^- is a strong field ligand)?

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

Which of the following statements is true about the octahedral complexes of Ni²⁺?

How many unpaired electrons are found in each of the following complex ions? -FeCl₄²^-

The complex ion NiCl₄²^- is tetrahedral.The number of unpaired electrons in the complex is:

Consider the pseudo-octahedral complex of Cr³⁺ shown below,where A and B represent Lewis bases and where A produces a stronger crystal field than B.Draw an appropriate crystal field diagram for this complex (include the electrons).

NiCl₄²^- (tetrahedral)