Question 1

How many geometric isomers exist for [Fe(H2O)4(NH3)2]3+?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  6 
A)  1 
B)  2 
C)  3 
D)  4 
E)  6

Question 2

What is the formula for dicyanobis(ethylenediamine)zirconium(IV)nitrate?

Accepted Answer

A)  Zr[(CN)2(NO3)2(en)2] 
B)  [Zr(CN)2(NO3)2(en)2] 
C)  (NO3)2[Zr(CN)2(en)2] 
D)  [Zr(CN)2(en)2](NO3)2 
E)  [Zr(NO3)2(en)2](CN)2 
A)  Zr[(CN)2(NO3)2(en)2] 
B)  [Zr(CN)2(NO3)2(en)2] 
C)  (NO3)2[Zr(CN)2(en)2] 
D)  [Zr(CN)2(en)2](NO3)2 
E)  [Zr(NO3)2(en)2](CN)2

Question 3

What is the electron configuration of Cr2+?

Accepted Answer

A)  1s22s22p63s23p6 
B)  1s22s22p63s23p63d64s2 
C)  1s22s22p63s23p63d34s2 
D)  1s22s22p63s23p63d54s1 
E)  1s22s22p63s23p63d4 
A)  1s22s22p63s23p6 
B)  1s22s22p63s23p63d64s2 
C)  1s22s22p63s23p63d34s2 
D)  1s22s22p63s23p63d54s1 
E)  1s22s22p63s23p63d4

Question 4

All of the following statements concerning crystal field theory are true EXCEPT

Accepted Answer

A)  in low-spin complexes,electrons are concentrated in the dxy,dyz,and dxz orbitals. 
B)  in an isolated atom or ion,the five d orbitals have identical energy. 
C)  low-spin complexes contain the maximum number of unpaired electrons. 
D)  the crystal field splitting is larger in low-spin complexes than high-spin complexes. 
E)  the energy difference between d orbitals often corresponds to an energy of visible light. 
A)  in low-spin complexes,electrons are concentrated in the dxy,dyz,and dxz orbitals. 
B)  in an isolated atom or ion,the five d orbitals have identical energy. 
C)  low-spin complexes contain the maximum number of unpaired electrons. 
D)  the crystal field splitting is larger in low-spin complexes than high-spin complexes. 
E)  the energy difference between d orbitals often corresponds to an energy of visible light.

Question 5

Which of the following species have geometric isomers: [Fe(en)Cl4]-,[Fe(en)2Cl2]+,and [Fe(en)2BrCl]+?

Accepted Answer

A)  [Fe(en)Cl4]- only 
B)  [Fe(en)2Cl2]+ only 
C)  [Fe(en)2BrCl]+ only 
D)  [Fe(en)2Cl2]+ and [Fe(en)2BrCl]+ 
E)  [Fe(en)Cl4]-,[Fe(en)2Cl2]+,and [Fe(en)2BrCl]+ 
A)  [Fe(en)Cl4]- only 
B)  [Fe(en)2Cl2]+ only 
C)  [Fe(en)2BrCl]+ only 
D)  [Fe(en)2Cl2]+ and [Fe(en)2BrCl]+ 
E)  [Fe(en)Cl4]-,[Fe(en)2Cl2]+,and [Fe(en)2BrCl]+

Question 6

What is the correct formula for a square planar copper(II)complex that is bonded to ethylenediamine ligands?

Accepted Answer

A)  Cu(en)2+ 
B)  Cu(en)22+ 
C)  Cu(en)32+ 
D)  Cu(en)42+ 
E)  Cu(en)62+ 
A)  Cu(en)2+ 
B)  Cu(en)22+ 
C)  Cu(en)32+ 
D)  Cu(en)42+ 
E)  Cu(en)62+

Question 7

If an octahedral iron(II)complex is diamagnetic,which of the following sets of conditions best describes the complex?

Accepted Answer

A)  low-spin,Δo small 
B)  low-spin,Δo large 
C)  high-spin,Δo small 
D)  high-spin,Δo large 
E)  none of these 
A)  low-spin,Δo small 
B)  low-spin,Δo large 
C)  high-spin,Δo small 
D)  high-spin,Δo large 
E)  none of these

Question 8

What is the coordination number of the central metal ion in [Ni(NH3)4(H2O)2]Cl2?

Accepted Answer

A)  0 
B)  2 
C)  4 
D)  6 
E)  8 
A)  0 
B)  2 
C)  4 
D)  6 
E)  8

Question 9

The complex FeF64− is paramagnetic.Which of the following set of terms best describes the complex?

Accepted Answer

A)  high-spin,Δo large 
B)  high-spin,Δo small 
C)  low-spin,Δo large 
D)  low-spin,Δo small 
E)  none of the above 
A)  high-spin,Δo large 
B)  high-spin,Δo small 
C)  low-spin,Δo large 
D)  low-spin,Δo small 
E)  none of the above

Question 10

What is the coordination number of the central metal ion in [Cr(en)2(OH)2]NO3? (en = H2NCH2CH2NH2)

Accepted Answer

A)  0 
B)  2 
C)  4 
D)  6 
E)  7 
A)  0 
B)  2 
C)  4 
D)  6 
E)  7

Question 11

All of the followings statements are true EXCEPT

Accepted Answer

A)  transition metal complexes are often colored,due to 3d to 1s electronic transitions. 
B)  in low-spin complexes,electrons are concentrated in the lower-energy orbitals. 
C)  low-spin complexes contain the minimum number of unpaired electrons. 
D)  the crystal field splitting energy is small in high-spin complexes. 
E)  the crystal field splitting energy of a metal complex can sometimes be determined from the absorption spectrum. 
A)  transition metal complexes are often colored,due to 3d to 1s electronic transitions. 
B)  in low-spin complexes,electrons are concentrated in the lower-energy orbitals. 
C)  low-spin complexes contain the minimum number of unpaired electrons. 
D)  the crystal field splitting energy is small in high-spin complexes. 
E)  the crystal field splitting energy of a metal complex can sometimes be determined from the absorption spectrum.

Question 12

When 6 ligands approach a central metal atom along the x-,y- and z-axes,they will cause the d orbitals to split in energy.The $ \mathrm{d}_{{x^{2}}-y^{2}} $ and the $ \mathrm{d}_{z^2} $ orbitals are most affected because

Accepted Answer

A)  the electron density in these orbitals is squared. 
B)  unlike the other d orbitals,these orbitals contain unpaired electrons and absorb the energy of light more readily,compared to the other three d orbitals. 
C)  unlike the other d orbitals,these orbitals each contain a pair of electrons. 
D)  they have the highest electron density along the x-,y-,and z-axes,and thus feel the greatest repulsion from the ligands' unpaired electrons. 
E)  the shape of these orbitals is similar to that of the ligands' orbitals. 
A)  the electron density in these orbitals is squared. 
B)  unlike the other d orbitals,these orbitals contain unpaired electrons and absorb the energy of light more readily,compared to the other three d orbitals. 
C)  unlike the other d orbitals,these orbitals each contain a pair of electrons. 
D)  they have the highest electron density along the x-,y-,and z-axes,and thus feel the greatest repulsion from the ligands' unpaired electrons. 
E)  the shape of these orbitals is similar to that of the ligands' orbitals.

Question 13

Identify the ligands and their charges in [Cr(en)4(CN)2]NO3.

Accepted Answer

A)  ethylenediamine (no charge) 
B)  cyanide (charge = no charge) 
C)  nitrate ion (charge = −1) 
D)  ethylenediamine (no charge),cyanide ion (charge = −1) 
E)  ethylenediamine (no charge),cyanide ion (charge = −1),nitrate ion (charge = −1) 
A)  ethylenediamine (no charge) 
B)  cyanide (charge = no charge) 
C)  nitrate ion (charge = −1) 
D)  ethylenediamine (no charge),cyanide ion (charge = −1) 
E)  ethylenediamine (no charge),cyanide ion (charge = −1),nitrate ion (charge = −1)

Question 14

Determine the number of unpaired electrons in an octahedral,strong-field Mn2+ complex ion.

Accepted Answer

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

Question 15

What is the coordination number of the copper in [Cu(NH3)2]Cl?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  8 
A)  1 
B)  2 
C)  3 
D)  4 
E)  8

Question 16

All of the following complexes will be colored (in the visible)EXCEPT ____.

Accepted Answer

A)  [Co(en)3]2+ 
B)  [Fe(CN)6]4- 
C)  [Ni(H2O)6]2+ 
D)  [Sc(NH3)6]3+ 
E)  [Cu(NH3)4]2+ 
A)  [Co(en)3]2+ 
B)  [Fe(CN)6]4- 
C)  [Ni(H2O)6]2+ 
D)  [Sc(NH3)6]3+ 
E)  [Cu(NH3)4]2+

Question 17

Heme is a coordination compound essential to your life.What is the metal ion coordinated in the heme of hemoglobin?

Accepted Answer

A)  Cu2+ 
B)  Ca2+ 
C)  Co2+ 
D)  Fe2+ 
E)  Mg2+ 
A)  Cu2+ 
B)  Ca2+ 
C)  Co2+ 
D)  Fe2+ 
E)  Mg2+

Question 18

What is the oxidation number of the iron in [Fe(CN)6]3−?

Accepted Answer

A)  −3 
B)  −2 
C)  +2 
D)  +3 
E)  +4 
A)  −3 
B)  −2 
C)  +2 
D)  +3 
E)  +4

Question 19

What is the name of the compound having the formula [Cr(en)2(H2O)2]SO4?

Accepted Answer

A)  dihydroxydiethlyenediamminechromate(II)sulfate 
B)  diaquabis(ethylenediamine)sulfatochromate(IV) 
C)  bis(ethylenediamine)diaquachromium(II)sulfato 
D)  diaquabis(ethylenediamine)sulfatochromium(II) 
E)  diaquabis(ethylenediamine)chromium(II)sulfate 
A)  dihydroxydiethlyenediamminechromate(II)sulfate 
B)  diaquabis(ethylenediamine)sulfatochromate(IV) 
C)  bis(ethylenediamine)diaquachromium(II)sulfato 
D)  diaquabis(ethylenediamine)sulfatochromium(II) 
E)  diaquabis(ethylenediamine)chromium(II)sulfate

Question 20

Which of the following ligands causes the greatest splitting of d orbitals?

Accepted Answer

A)  H2O 
B)  NO2− 
C)  Cl− 
D)  F− 
E)  NH3 
A)  H2O 
B)  NO2− 
C)  Cl− 
D)  F− 
E)  NH3

Exam 19: Complex Ions

How many geometric isomers exist for [Fe(H2O)4(NH3)2]3+?

What is the formula for dicyanobis(ethylenediamine)zirconium(IV)nitrate?

What is the electron configuration of Cr2+?

All of the following statements concerning crystal field theory are true EXCEPT

Which of the following species have geometric isomers: [Fe(en)Cl4]-,[Fe(en)2Cl2]+,and [Fe(en)2BrCl]+?

What is the correct formula for a square planar copper(II)complex that is bonded to ethylenediamine ligands?

If an octahedral iron(II)complex is diamagnetic,which of the following sets of conditions best describes the complex?

What is the coordination number of the central metal ion in [Ni(NH3)4(H2O)2]Cl2?

The complex FeF64− is paramagnetic.Which of the following set of terms best describes the complex?

What is the coordination number of the central metal ion in [Cr(en)2(OH)2]NO3? (en = H2NCH2CH2NH2)

All of the followings statements are true EXCEPT

When 6 ligands approach a central metal atom along the x-,y- and z-axes,they will cause the d orbitals to split in energy.The dx2−y2 \mathrm{d}_{{x^{2}}-y^{2}} dx2−y2​ and the dz2 \mathrm{d}_{z^2} dz2​ orbitals are most affected because

Identify the ligands and their charges in [Cr(en)4(CN)2]NO3.

Determine the number of unpaired electrons in an octahedral,strong-field Mn2+ complex ion.

What is the coordination number of the copper in [Cu(NH3)2]Cl?

All of the following complexes will be colored (in the visible)EXCEPT ____.

Heme is a coordination compound essential to your life.What is the metal ion coordinated in the heme of hemoglobin?

What is the oxidation number of the iron in [Fe(CN)6]3−?

What is the name of the compound having the formula [Cr(en)2(H2O)2]SO4?

Which of the following ligands causes the greatest splitting of d orbitals?

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Filters

How many geometric isomers exist for [Fe(H₂O)₄(NH₃)₂]³⁺?

What is the electron configuration of Cr²⁺?

Which of the following species have geometric isomers: [Fe(en)Cl₄]^-,[Fe(en)₂Cl₂]⁺,and [Fe(en)₂BrCl]⁺?

What is the coordination number of the central metal ion in [Ni(NH₃)₄(H₂O)₂]Cl₂?

The complex FeF₆⁴⁻ is paramagnetic.Which of the following set of terms best describes the complex?

What is the coordination number of the central metal ion in [Cr(en)₂(OH)₂]NO₃? (en = H₂NCH₂CH₂NH₂)

When 6 ligands approach a central metal atom along the x-,y- and z-axes,they will cause the d orbitals to split in energy.The $\mathrm{d}_{{x^{2}}-y^{2}}$ and the $\mathrm{d}_{z^2}$ orbitals are most affected because

Identify the ligands and their charges in [Cr(en)₄(CN)₂]NO₃.

Determine the number of unpaired electrons in an octahedral,strong-field Mn²⁺ complex ion.

What is the coordination number of the copper in [Cu(NH₃)₂]Cl?

What is the oxidation number of the iron in [Fe(CN)₆]³⁻?

What is the name of the compound having the formula [Cr(en)₂(H₂O)₂]SO₄?