Deck 23: Transition Metal Chemistry and Coordination Compounds

Question 1

Which of the following choices can function as a bidentate ligand?

A)PH₃
B)Cl^-
C)CN^-
D)(^-OCH₂CH₂CH₂O^-)
E)CO

Answer 1

(^-OCH₂CH₂CH₂O^-)

Question 2

The electron configuration of a Ti atom is

A)[Ne]3s²3d².
B)[Ne] 3s²4d².
C)[Ar]4s²3d².
D)[Ar]4s²4d².
E)[Ar]3d⁴.

Answer 2

[Ar]4s²3d².

Question 3

In [Cu(NH₃)₄]CO₃, how many 3d electrons does copper have?

A)6
B)7
C)8
D)9
E)10

Answer 3

9

Question 4

The total number of electrons in the 3d orbitals of Ti³⁺ is

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

Question 5

How would you expect the molecule 1,10-phenanthroline (shown below)to function as a ligand?

A)It would be expected to be a monodentate ligand.
B)It would be expected to be a bidentate ligand.
C)It would be expected to be a tridentate ligand.
D)It would be expected to be a tetradentate ligand.
E)It would not be expected to function as a ligand.

Question 6

How many 3d electrons does a Mn²⁺ ion have?

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

Question 7

The electron configuration of a nickel atom is

A)[Ar]4s²3d⁶.
B)[Ar]4s¹3d⁷.
C)[Ar]3d⁸.
D)[Ar]4s²3d⁸.
E)[Ar]3d¹⁰.

Question 8

The electron configuration of a Co³⁺ ion is

A)[Ar]3d⁶.
B)[Ar]4s¹3d⁵.
C)[Ar] 4s²3d⁴.
D)[Ar]3d⁵.
E)[Ar]3d⁴.

Question 9

How many 3d electrons does a V³⁺ ion have?

A)6
B)5
C)4
D)3
E)2

Question 10

The total number of electrons in the 3d orbitals of a titanium atom is

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

Question 11

The electron configuration of a Cr³⁺ ion is

A)[Ar]3d⁵.
B)[Ar]4s¹3d².
C)[Ar]3d³.
D)[Ar]4s¹3d⁵.
E)[Ar]4s²3d⁴.

Question 12

The total number of electrons in the 3d orbitals of Co³⁺ is

A)4
B)5
C)6
D)7
E)10

Question 13

Which of the following choices can function as a monodentate ligand only?

A)(H₂NCH₂CH₂NH₂)
B)(^-O₂CCO₂^-
C)(H₂O)
D)(^-OCH₂CH₂CH₂O^-)
E)(H₂PCH₂CH₂PH₂)

Question 14

The total number of electrons in the 3d orbitals of a copper atom is

A)6
B)7
C)8
D)9
E)10

Question 15

The electron configuration of an Fe²⁺ ion is

A)[Ar]4s²4d⁴.
B)[Ar]4s²3d⁶.
C)[Ar]3d³.
D)[Ar]3d⁵.
E)[Ar]3d⁶.

Question 16

Assuming a coordination complex is formed with Fe²⁺ and 1,10-phenanthroline (shown below), which of the following statements is true?

A)If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 2.
B)If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6.
C)If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 3.
D)If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6.
E)If four 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 4.

Question 17

In the complex ion [Fe(CN)₆]^4-, the oxidation number of Fe is

A)+1.
B)+2.
C)+3.
D)-4.
E)+6.

Question 18

In Na₃[Ni(SCN)₅], how many 3d electrons does nickel have?

A)6
B)7
C)8
D)9
E)10

Question 19

In K₄[Fe(CN)₆], how many 3d electrons does the iron atom have?

A)3
B)4
C)5
D)6
E)7

Question 20

The total number of electrons in the 3d orbitals of Cr³⁺ is

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

Question 21

In the coordination compound [Cr(NH₃)(en)₂Cl]Br₂, the coordination number (C.N.)and oxidation number (O.N.)of the metal atom are, respectively,

A)C.N.= 6; O.N.= +4.
B)C.N.= 6; O.N.= +3.
C)C.N.= 5; O.N.= +2.
D)C.N.= 4; O.N.= +2.
E)C.N.= 4; O.N.= +3.

Question 22

In the coordination compound [Pt(NH₃)₂Cl₂], the coordination number and oxidation number of the central atom are, respectively,

A)2, 0.
B)4, 4.
C)5, 0.
D)4, 2.
E)6, 2.

Question 23

In the complex ion [Co(en)₂Br₂]⁺, the oxidation number of Co is

A)+1.
B)+2.
C)+3.
D)-2.
E)-1.

Question 24

The best name for the complex shown below is

A)cobalt(III)bis(ethylenediamine)bromide.
B)dibromobis(ethylenediamine)cobalt(III)bromide.
C)dibromidedi(ethylenediamine)cobalt(III)bromide.
D)dibromodiethylenediaaminecobalt(III)bromide.
E)tribromobis(ethylenediamine)cobalt(III).

Question 25

The correct formula for dicarbonylsilver (I)ion is:

A)Ag(CO)₂
B)[Ag(CO)₂]⁺
C)[Ag(CO)₂]²⁺
D)[Ag(CO)₂]^-
E)[Ag(CO)₂]^2-

Question 26

In the coordination compound K₂[Co(en)Cl₄], the coordination number (C.N.)and oxidation number (O.N.)of cobalt are

A)C.N.= 6; O.N.= +2.
B)C.N.= 6; O.N.= +3.
C)C.N.= 5; O.N.= +2.
D)C.N.= 5; O.N.= +4.
E)C.N.= 4; O.N.= +3.

Question 27

The correct name for Fe(CO)₅ is:

A)pentacarbonyliron(V)
B)pentacarbonyliron(0)
C)hexacarbonyliron(0)
D)hexacarbonyliron(V)
E)pentacarbonateiron(0)

Question 28

The correct formula for sodium tetracyanonickelate(II)ion is:

A)Ni(CN)₄
B)[Ni(CN)₄]⁺
C)[Ni(CN)₄]²⁺
D)[Ni(CN)₄]^-
E)[Ni(CN)₄]^2-

Question 29

Give the coordination number (C.N.)and oxidation number (O.N.)of the metal atom in the coordination compound [Cr(NH₃)₂(en)Cl₂].

A)C.N.= 4; O.N.= +2.
B)C.N.= 5; O.N.= +3.
C)C.N.= 5; O.N.= +2.
D)C.N.= 6; O.N.= +3.
E)C.N.= 6; O.N.= +2.

Question 30

The correct formula for the dichlorobis(ethylenediamine)chromium(III)ion is

A)[Cr(en)₂Cl₂]³⁺.
B)[Cr(en)Cl₂]⁺.
C)[Cr(en)₂Cl₂]²⁺.
D)[Cr(en)₂Cl₂]⁺.
E)[Cr(en)₃Cl₂]⁺.

Question 31

In the coordination compound [Co(en)₂Cl₂]Cl, the coordination number and oxidation number of the central atom are, respectively,

A)4, +3.
B)6, +2.
C)4, +2.
D)6, +3.
E)4, +1.

Question 32

The best name for K₄[FeCl₂(CN)₄] is

A)tetrapotassium dichlorodicyanoiron(II).
B)potassium dichlorodicyanoiron(II).
C)potassium dichlorodicyanoferrate(III).
D)tetrapotassium dichlorobis(cyano)iron(III).
E)potassium dichlorotetracyanoferrate(II).

Question 33

The correct formula for pentaamminechloroplatinum(IV)chloride is:

A)[Pt(NH₃)₅Cl]Cl₃
B)[Pt(NH₃)₅Cl]Cl₂
C)[Pt(NH₃)₅]Cl₃
D)[Pt(NH₃)₅Cl]Cl₄
E)[Pt(NH₃)₅]Cl₄

Question 34

Which of these octahedral complexes can have cis-trans isomers?

A)Co(NH₃)₃Cl₃
B)[Co(NH₃)₅Cl]Cl₂
C)[Co(NH₃)₆]Cl₃
D)Na₃[CoCl₆]
E)Na₂[Co(NH₃)Cl₅]

Question 35

In the complex ion [Cr(C₂O₄)₂(H₂O)₂]^-, the oxidation number of Cr is

A)+1.
B)+2.
C)+3.
D)-2.
E)-1.

Question 36

Which of these square planar complex ions can have cis-trans isomers?

A)[Pt(NH₃)₄]²⁺
B)[Ni(NH₃)₄]²⁺
C)[Pt(NH₃)₂Cl₂]
D)[Pt(NH₃)Cl₃]^-
E)[Ni(NH₃)₃Cl]⁺

Question 37

The correct name for [Fe(CO)₆]Br₃ is:

A)hexacarbonyliron(II)bromide
B)hexacarbonyliron(III)bromide
C)hexacarbonyltribromoiron(III)
D)hexacarbonyltribromoiron(II)
E)hexacarbonyliron(III)tribromide

Question 38

The coordination compound shown below has

A)two monodentate ligands and two bidentate ligands.
B)three monodentate ligands and two bidentate ligands.
C)four monodentate ligands and two bidentate ligands.
D)one monodentate ligand and four bidentate ligands.
E)four bidentate ligands.

Question 39

Which response gives the correct coordination number (C.N.)and oxidation number (O.N.)of the transition metal atom in [Co(NH₃)₂(H₂O)₂Cl₂]⁺?

A)C.N.= 2; O.N.= +3
B)C.N.= 3; O.N.= +1
C)C.N.= 4; O.N.= +2
D)C.N.= 6; O.N.= +1
E)C.N.= 6; O.N.= +3

Question 40

The correct name for K₃[Fe(C₂O₄)₃] is:

A)tripotassium trioxalatoiron(III)
B)potassium trioxalatoiron(II)
C)potassium trioxalatoiron(III)
D)tripotassium oxalatoiron(0)
E)potassium trioxalateiron(II)

Question 41

How many unpaired electrons are there in the complex ion [Mn(CN)₆]^3-?

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

Question 42

Which one of these complex ions would absorb light with the shortest wavelength?

A)[Co(H₂O)₆]²⁺
B)[Co(NH₃)₆]²⁺
C)[CoF₆]^4-
D)[Co(CN)₆]^4-
E)[Co(en)₆]²⁺

Question 43

Which of the following complexes has optical (chiral)isomers?

A)[Co(NH₃)₄Br₂]⁺
B)[Co(en)₃]³⁺
C)Co(NH₃)₃Br₃
D)[Co(en)Br₄] ^-
E)[Co(en)(NH₃)₄] ³⁺

Question 44

Which of the following complexes has optical (chiral)isomers?

A)[Co(H₂O)₄Br₂]⁺
B)[Co(en)Cl₄] ^-
C)[Co(en)(H₂O)₄] ³⁺
D)[Co(en)₂Cl₂]⁺
E)Co(H₂O)₃Cl₃

Question 45

Which of these electron energy level patterns would absorb light with the shortest wavelength?

A)A
B)B
C)C
D)D

Question 46

Which of these complex ions would absorb light with the longest wavelength?

A)[Co(H₂O)₆]²⁺
B)[Co(NH₃)₆]²⁺
C)[CoF₆]^4-
D)[Co(CN)₆]^4-
E)[Co(en)₆]²⁺

Question 47

How many unpaired electrons does the manganese ion have in [Mn(CN)₆]^4-?

A)1 unpaired electron
B)2 unpaired electrons
C)3 unpaired electrons
D)5 unpaired electrons
E)No unpaired electrons

Question 48

Two well-known complex ions containing Ni are [Ni(H₂O)₆]²⁺, which is green, and [Ni(en)₃]²⁺, which is purple.Which one of these statements is true?

A)The crystal field splitting energy ( $\Delta$ )is greater for [Ni(en)₃]²⁺ than for [Ni(H₂O)₆]²⁺.
B)[Ni(en)₃]²⁺ absorbs energy in the red region of the spectrum.
C)Both complex ions are diamagnetic.
D)[Ni(H₂O)₆]²⁺ transmits light with wavelengths of approximately 650-700 nm.
E)The green complex absorbs green light.

Question 49

In the complex ion [ML₆]ⁿ⁺, Mⁿ⁺ has seven d electrons and L is a weak field ligand.According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons?

A)0
B)1
C)2
D)3
E)5

Question 50

In the complex ion [ML₆]ⁿ⁺, Mⁿ⁺ has six d electrons and L is a weak field ligand.According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons?

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

Question 51

Which of these ligands produces the weakest crystal field?

A)CN^-
B)I^-
C)OH^-
D)H₂O
E)NH₃

Question 52

In the complex ion [ML₆]ⁿ⁺, Mⁿ⁺ has five d electrons and L is a strong field ligand.According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons?

A)0
B)1
C)2
D)3
E)5

Question 53

Labile complexes are coordination complexes that

A)are labeled with a radioactive isotope.
B)are thermodynamically stable.
C)are thermodynamically unstable.
D)undergo rapid ligand exchange reactions.
E)undergo very slow ligand exchange reactions.

Question 54

The number of geometrical isomers and optical isomers of the complex ion [Co(en)₃]³⁺ are, respectively,

A)2 and 2.
B)1 and 1.
C)3 and 2.
D)1 and 2.
E)2 and 4.

Question 55

Two complex ions containing Ni are [Ni(NH₃)₆]²⁺, which is blue, and [Ni(en)₃]²⁺, which is purple.Which one of these statements is true?

A)The crystal field splitting energy ( $\Delta$ )is greater for [Ni(NH₃)₆]²⁺ than for [Ni(en)₃]²⁺.
B)[Ni(en)₃]²⁺ absorbs light in the violet region of the spectrum.
C)Both complex ions are diamagnetic.
D)The energy of the photon absorbed by [Ni(en)₃]²⁺ is greater than that absorbed by [Ni(NH₃)₆]²⁺.
E)The wavelength of the light absorbed by [Ni(en)₃]²⁺ is greater than the wavelength absorbed by [Ni(NH₃)₆]²⁺.

Question 56

The ion [Co(NH₃)₆]²⁺ is octahedral and high spin.This complex is

A)paramagnetic, with 1 unpaired electron.
B)paramagnetic, with 3 unpaired electrons.
C)paramagnetic, with 4 unpaired electrons.
D)paramagnetic, with 5 unpaired electrons.
E)diamagnetic.

Question 57

In the complex ion [ML₆]ⁿ⁺, Mⁿ⁺ has seven d electrons and L is a strong field ligand.According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons?

A)0
B)1
C)2
D)3
E)5

Question 58

Which of these ligands produces the strongest crystal field?

A)Cl^-
B)CO
C)OH^-
D)H₂O
E)NH₃

Question 59

Consider the [CoCl₆]^4- ion.Determine which responses are true statements. I.The oxidation number of Co is -4.
II.The coordination number of cobalt is 6.
III.It is paramagnetic.
IV.It is a low-spin complex.

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

Question 60

A complex with the composition [MA₂B₂]X₂ is found to have no geometrical isomers.Both A and B are monodentate ligands.The structure of the complex is

A)linear.
B)square planar.
C)tetrahedral.
D)octahedral.

Question 61

Write the chemical formula of triammineaquodichlorochromium(III)chloride.

Question 62

Write the chemical formula of the dibromobis(oxalato)cobaltate(III)ion.

Question 63

What is the oxidation number of cobalt in [Co(NH₃)₆]Cl₃?

Question 64

What is the oxidation number of Co in the complex Co(H₂O)₃Cl₃?

Question 65

Ethylenediaminetetraacetic acid (EDTA)is

A)not useful as a chelating agent.
B)an effective antidote for heavy metal poisoning (e.g., Pb²⁺ and Hg²⁺).
C)a monodentate ligand.
D)known to form unstable complex ions with Fe³⁺, Hg²⁺, and Zn²⁺.
E)known to form complexes with platinum that inhibit the growth of cancerous cells.

Question 66

What is the oxidation number of Co in the complex Na[Co(H₂O)₂Cl₄]?

Question 67

A molecule or ion that provides an electron pair for coordinate covalent bond formation is called a Lewis ________.

Question 68

What terms describe the geometric isomers that are possible for the complex [CrF₂Cl₄]^3-?

Question 69

A molecule or atom that accepts an electron pair to form a coordinate covalent bond is called a Lewis _______.

Question 70

What is the oxidation number of Co in the complex [Co(H₂O)₄Cl₂]Cl?

Question 71

Name the complex ion [Ni(CN)₄]^2-.

Question 72

Draw and label the geometric isomers of [CrF₂Cl₄]^3-?

Question 73

What is the oxidation number of Fe in [Fe(CN)₆]^4-?

Question 74

What is the coordination number of chromium in Cr(en)₂Cl₂?

Question 75

Copper can be separated from iron in the ore chalcopyrite (CuFeS₂)by heating the ore in the presence of oxygen to form copper(I)sulfide, iron(II)oxide, and sulfur dioxide.Write a balanced chemical equation for this process.

Question 76

What is the coordination number of cobalt in [Co(NH₃)₆]Cl₃?

Question 77

What is the coordination number of silver in [Ag(NH₃)₂]Cl?

Question 78

How many geometric isomers are possible for the complex [CrF₃Br₃]^3-? Draw these isomers.

Question 79

Cis-platinum complexes are

A)used in the extraction of silver and gold.
B)effective antidotes for heavy metal poisoning (e.g., Pb²⁺ and Hg²⁺).
C)used to provide nutrients for plants.
D)used to prevent eutrophication of lakes.
E)effective antitumor agents.

Question 80

Write the chemical formula of diamminedichloroplatinum(II).