Question 1

What is the coordination number of cobalt in the complex ion [Co(en) Cl4]-? (en = ethylenediamine)

Accepted Answer

A)   1
B)   2
C)   4
D)   6
E)   8F) None of the above
G) A) and C)

Question 2

Which of the following species could exist as isomers?

Accepted Answer

A)   [Co(H2O) 4Cl2]+
B)   [Pt(NH3) Br3]-
C)   [Pt(en) Cl2]
D)   [Pt(NH3) 3Cl]+
E)   none of the aboveF) All of the above
G) A) and E)

Question 3

Which of the following ligands could participate in linkage isomerism?

Accepted Answer

A)   NH3
B)   H2O
C)   NH4+
D)   NO2-
E)   ethylenediamineF) C) and E)
G) B) and E)

Question 4

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y.  Which one, if any, of the following is a pair of optical isomers?

Accepted Answer

A)   1 and 2
B)   1 and 3
C)   1 and 4
D)   3 and 4
E)   none of the aboveF) D) and E)
G) A) and B) A

Question 5

A feature of transition metal chemistry is that these elements exhibit multiple oxidation states. Which one of the following elements exhibits the smallest number of different oxidation states?

Accepted Answer

A)   Ti
B)   Cr
C)   Mn
D)   Co
E)   ZnF) A) and E)
G) C) and E)

Question 6

The crystal field splitting energy, ,

Accepted Answer

A)   is larger for tetrahedral complexes than for octahedral complexes.
B)   depends on the metal but not on the ligand.
C)   determines the color of a complex.
D)   is larger for ionic ligands like chloride than for molecular ligands like carbon monoxide, CO.
E)   determines the charge of a complex.F) A) and D)
G) A) and C)

Question 7

Which of the oxidation states of chromium has the largest valence-state electronegativity?

Accepted Answer

A)   chromium(0) 
B)   chromium(II) 
C)   chromium(III) 
D)   chromium(IV) 
E)   chromium(VI) F) B) and E)
G) A) and B)

Question 8

A certain transition metal complex has the formula MX42+. If the metal ion has a d8 electron configuration, what is the shape of the complex?

Accepted Answer

A)   octahedral
B)   square pyramid
C)   tetrahedral
D)   trigonal pyramid
E)   square planarF) C) and D)
G) B) and E)

Question 9

What is the highest possible oxidation state for palladium, Pd?

Accepted Answer

A)   +1
B)   +2
C)   +3
D)   +4
E)   +6F) A) and B)
G) D) and E)

Question 10

How many unpaired electrons will there be in a high-spin octahedral complex of Fe(II) ?

Accepted Answer

A)   0
B)   2
C)   4
D)   6
E)   none of the aboveF) None of the above
G) A) and B)

Question 11

In the presence of a strong octahedral ligand field, the number of unpaired electrons in Co(III)  will be

Accepted Answer

A)   0.
B)   2.
C)   4.
D)   6.
E)   none of the above.F) None of the above
G) D) and E)

Question 12

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y.  Which one of the following statements about these structures is incorrect?

Accepted Answer

A)   Structures 1 and 2 are optical isomers.
B)   Structures 1 and 3 are optical isomers.
C)   Structures 1 and 3 are different complexes.
D)   Structures 1 and 4 are geometrical isomers.
E)   Structures 3 and 4 are the same complex.F) A) and C)
G) A) and D)

Question 13

When the ethylenediaminetetraacetate ion (EDTA4-)  forms a complex with a transition metal ion, how many electrons does it normally donate to the metal?

Accepted Answer

A)   4
B)   6
C)   8
D)   10
E)   12F) C) and E)
G) None of the above

Question 14

a. How many unpaired 3d electrons will there be in (i) high and (ii) low-spin complexes of Co(II)?
b. How can high and low-spin complexes be recognized and distinguished experimentally?

Accepted Answer

a. (i) high-spin, 3 unpaired electrons
(ii) low-spin, 1 unpaired electron
b. Unpaired electrons interact strongly with a magnetic field, and this property is used to determine the number of such electrons in a complex.

Question 15

Chromium and manganese are among the transition elements that form several different oxides. Which of the following statements characterize these oxides?

Accepted Answer

A)   As the oxidation number on the metal increases, the valence-state electronegativity increases and the oxides change from acidic to basic.
B)   As the oxidation number on the metal increases, the valence-state electronegativity increases and the oxides change from basic to acidic.
C)   As the oxidation number on the metal increases, the valence-state electronegativity decreases and the oxides change from acidic to basic.
D)   As the oxidation number on the metal increases, the valence-state electronegativity decreases and the oxides change from basic to acidic.
E)   None of the above statements is correct.F) D) and E)
G) B) and D)

Question 16

The ground state electronic configuration of Zn2+ is

Accepted Answer

A)   [Ar]4s23d8.
B)   [Ar]4s23d10.
C)   [Ar]4s13d9.
D)   [Ar]3d10.
E)   [Ar]3d8.F) A) and E)
G) A) and C)

Question 17

Give the systematic name for [CoCl3(H2O) ]-.

Accepted Answer

A)   cobalt(II)  chloride monohydrate
B)   aquatrichlorocobalt(II) 
C)   aquatrichlorocobaltate(II) 
D)   aquatrichlorocobaltite(I) 
E)   none of the aboveF) A) and B)
G) A) and C)

Question 18

Which of the following ions is least likely to form colored compounds?

Accepted Answer

A)   Mn2+
B)   Cr5+
C)   Sc3+
D)   Fe3+
E)   Co2+F) D) and E)
G) A) and E)

Question 19

Which one of the following normally acts as a bidentate ligand in complexes with transition metal ions?

Accepted Answer

A)   CN-
B)   EDTA4-
C)   SCN-
D)   ethylene diamine
E)   ethylene, C2H4F) B) and C)
G) D) and E)

Question 20

a. Explain how the crystal field theory can use the magnitude of the splitting energy F1F1F1S1F1F1F10 to provide an explanation of the color and magnetic properties of octahedral complexes.
b. In promoting an electron from the t2g set of orbitals to the eg set, an octahedral complex absorbs a photon with a wavelength F1F1F1S1F1F1F10 of 523 nm. Calculate the value of F1F1F1S1F1F1F10 in the complex, in kJ/mol.

Accepted Answer

a. The energy needed for a photon to excite an electron from the lower to the higher set of the split d orbitals, will increase as F1F1F1S1F1F1F10 increases. This will mean the complex absorbs at shorter wavelengths, influencing its color. Also, a large splitting energy F1F1F1S1F1F1F10 will tend to produce low-spin complexes.
b. 229 kJ/mol

Exam 23: The Transition Elements and Their Coordination Compounds

What is the coordination number of cobalt in the complex ion [Co(en) Cl₄]^-? (en = ethylenediamine)

Correct Answer
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Which of the following species could exist as isomers?

Correct Answer
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Which of the following ligands could participate in linkage isomerism?

Correct Answer
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Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. Which one, if any, of the following is a pair of optical isomers?

Correct Answer
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A

A feature of transition metal chemistry is that these elements exhibit multiple oxidation states. Which one of the following elements exhibits the smallest number of different oxidation states?

Correct Answer
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The crystal field splitting energy, ,

Correct Answer
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Which of the oxidation states of chromium has the largest valence-state electronegativity?

Correct Answer
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A certain transition metal complex has the formula MX₄²⁺. If the metal ion has a d⁸ electron configuration, what is the shape of the complex?

Correct Answer
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What is the highest possible oxidation state for palladium, Pd?

Correct Answer
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How many unpaired electrons will there be in a high-spin octahedral complex of Fe(II) ?

Correct Answer
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In the presence of a strong octahedral ligand field, the number of unpaired electrons in Co(III) will be

Correct Answer
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Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. Which one of the following statements about these structures is incorrect?

Correct Answer
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When the ethylenediaminetetraacetate ion (EDTA^4-) forms a complex with a transition metal ion, how many electrons does it normally donate to the metal?

Correct Answer
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a. How many unpaired 3d electrons will there be in (i) high and (ii) low-spin complexes of Co(II)? b. How can high and low-spin complexes be recognized and distinguished experimentally?

Correct Answer
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a. (i) high-spin, 3 unpaired electrons (ii) low-spin, 1 unpaired electron b. Unpaired electrons interact strongly with a magnetic field, and this property is used to determine the number of such electrons in a complex.

Chromium and manganese are among the transition elements that form several different oxides. Which of the following statements characterize these oxides?

Correct Answer
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The ground state electronic configuration of Zn²⁺ is

Correct Answer
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Give the systematic name for [CoCl₃(H₂O) ]^-.

Correct Answer
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Which of the following ions is least likely to form colored compounds?

Correct Answer
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Which one of the following normally acts as a bidentate ligand in complexes with transition metal ions?

Correct Answer
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Exam 23: The Transition Elements and Their Coordination Compounds

What is the coordination number of cobalt in the complex ion [Co(en) Cl4]-? (en = ethylenediamine)

Correct AnswerverifiedShow Answer

Which of the following species could exist as isomers?

Correct AnswerverifiedShow Answer

Which of the following ligands could participate in linkage isomerism?

Correct AnswerverifiedShow Answer

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. Which one, if any, of the following is a pair of optical isomers?

Correct AnswerverifiedA

A feature of transition metal chemistry is that these elements exhibit multiple oxidation states. Which one of the following elements exhibits the smallest number of different oxidation states?

Correct AnswerverifiedShow Answer

The crystal field splitting energy, ,

Correct AnswerverifiedShow Answer

Which of the oxidation states of chromium has the largest valence-state electronegativity?

Correct AnswerverifiedShow Answer

A certain transition metal complex has the formula MX42+. If the metal ion has a d8 electron configuration, what is the shape of the complex?

Correct AnswerverifiedShow Answer

What is the highest possible oxidation state for palladium, Pd?

Correct AnswerverifiedShow Answer

How many unpaired electrons will there be in a high-spin octahedral complex of Fe(II) ?

Correct AnswerverifiedShow Answer

In the presence of a strong octahedral ligand field, the number of unpaired electrons in Co(III) will be

Correct AnswerverifiedShow Answer

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. Which one of the following statements about these structures is incorrect?

Correct AnswerverifiedShow Answer

When the ethylenediaminetetraacetate ion (EDTA4-) forms a complex with a transition metal ion, how many electrons does it normally donate to the metal?

Correct AnswerverifiedShow Answer

a. How many unpaired 3d electrons will there be in (i) high and (ii) low-spin complexes of Co(II)? b. How can high and low-spin complexes be recognized and distinguished experimentally?

Correct Answerverifieda. (i) high-spin, 3 unpaired electrons (ii) low-spin, 1 unpaired electron b. Unpaired electrons interact strongly with a magnetic field, and this property is used to determine the number of such electrons in a complex.

Chromium and manganese are among the transition elements that form several different oxides. Which of the following statements characterize these oxides?

Correct AnswerverifiedShow Answer

The ground state electronic configuration of Zn2+ is

Correct AnswerverifiedShow Answer

Give the systematic name for [CoCl3(H2O) ]-.

Correct AnswerverifiedShow Answer

Which of the following ions is least likely to form colored compounds?

Correct AnswerverifiedShow Answer

Which one of the following normally acts as a bidentate ligand in complexes with transition metal ions?

Correct AnswerverifiedShow Answer

What is the coordination number of cobalt in the complex ion [Co(en) Cl₄]^-? (en = ethylenediamine)

Correct Answer
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A

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A certain transition metal complex has the formula MX₄²⁺. If the metal ion has a d⁸ electron configuration, what is the shape of the complex?

Correct Answer
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When the ethylenediaminetetraacetate ion (EDTA^4-) forms a complex with a transition metal ion, how many electrons does it normally donate to the metal?

Correct Answer
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Correct Answer
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a. (i) high-spin, 3 unpaired electrons (ii) low-spin, 1 unpaired electron b. Unpaired electrons interact strongly with a magnetic field, and this property is used to determine the number of such electrons in a complex.

Correct Answer
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The ground state electronic configuration of Zn²⁺ is

Correct Answer
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Give the systematic name for [CoCl₃(H₂O) ]^-.

Correct Answer
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