Question 1

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

Question 2

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 × 10-4 g 
B)  1.77 × 10-3 g 
C)  5.00 × 10-3 g 
D)  1.60 × 10-2 g 
E)  6.38 × 10-2 g

Question 3

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 4

For which of the following metal ions would there be no distinction between low spin and high spin in octahedral complexes?

Accepted Answer

A)  Cr2+ 
B)  Mn2+ 
C)  Ni3+ 
D)  V2+ 
E)  Co3+

Question 5

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

Accepted Answer

The answer of Explain the toxicities of carbon monoxide (CO)...

Question 6

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

The answer of Consider the pseudo-octahedral complex of Cr³⁺ shown...

Question 7

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 8

How many unpaired electrons are found in [CoCl6]3- (weak field)?

Accepted Answer

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

Question 9

Which transition metal can exist in all oxidation states from +2 to +7?

Accepted Answer

A)  iron 
B)  vanadium 
C)  copper 
D)  manganese 
E)  chromium

Question 10

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.

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

Oxygen is stored in mammalian tissue in which type of molecule?

Accepted Answer

A)  chlorophyll 
B)  cytochrome 
C)  hemoglobin 
D)  prophyrin 
E)  myoglobin

Question 13

In which of the following complexes does the transition metal have a d8 configuration?

Accepted Answer

A)  [Zn(NH3)4]2+ 
B)  [NiBr4]2- 
C)  [Mn(CN)6]3- 
D)  [Ni(CO)4] 
E)  [Ti(H2O)6]2+

Question 14

The empirical formula of a compound with a mass percent composition of 6.78% H, 31.43% N, 39.76% Cl, and 22.03% Co is consistent with which of the following complexes?

Accepted Answer

A)  [Co(NH3)4Cl2]Cl 
B)  [Co(NH3)3Cl3] 
C)  [Co(NH3)6]Cl3 
D)  [Co(NH3)5Cl]Cl2 
E)  none of these

Question 15

Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in complex ions. Based on this information, predict the number of unpaired electrons in [CoF6]3-.

Accepted Answer

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

Question 16

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

Accepted Answer

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

Exam 19: Transition Metals and Coordination Chemistry

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?

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

For which of the following metal ions would there be no distinction between low spin and high spin in octahedral complexes?

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

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).

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

How many unpaired electrons are found in [CoCl₆]^3- (weak field) ?

Which transition metal can exist in all oxidation states from +2 to +7?

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

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

Oxygen is stored in mammalian tissue in which type of molecule?

In which of the following complexes does the transition metal have a d⁸ configuration?

The empirical formula of a compound with a mass percent composition of 6.78% H, 31.43% N, 39.76% Cl, and 22.03% Co is consistent with which of the following complexes?

Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in complex ions. Based on this information, predict the number of unpaired electrons in [CoF₆]^3-.

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

Exam 19: Transition Metals and Coordination Chemistry

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?

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

For which of the following metal ions would there be no distinction between low spin and high spin in octahedral complexes?

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

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).

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

How many unpaired electrons are found in [CoCl6]3- (weak field) ?

Which transition metal can exist in all oxidation states from +2 to +7?

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

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

Oxygen is stored in mammalian tissue in which type of molecule?

In which of the following complexes does the transition metal have a d8 configuration?

The empirical formula of a compound with a mass percent composition of 6.78% H, 31.43% N, 39.76% Cl, and 22.03% Co is consistent with which of the following complexes?

Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in complex ions. Based on this information, predict the number of unpaired electrons in [CoF6]3-.

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

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

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

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).

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

How many unpaired electrons are found in [CoCl₆]^3- (weak field) ?

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

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

In which of the following complexes does the transition metal have a d⁸ configuration?

Fluoride ion ranks low in the spectrochemical series and produces a weak crystal field in complex ions. Based on this information, predict the number of unpaired electrons in [CoF₆]^3-.

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