Deck 23: Transition Metals Biological and Medical Applications

Question 1

What is the coordination number for Ni(CN)₄^2-?

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

Answer 1

4

Question 2

What is the coordination number of cobalt in the [Co (NH₃)₄Cl₂]^- complex ion?

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

Answer 2

6

Question 3

A Lewis acid is

A)a proton donor.
B)a proton acceptor.
C)an electron-pair donor.
D)an electron-pair acceptor.
E)never viewed also as a Brønsted-Lowry acid.

Answer 3

an electron-pair acceptor.

Question 4

What is the oxidation state of the metal atom in the complex ion in K[Pt(NH₃)Cl₅]?

A)(+6)
B)(+5)
C)(+4)
D)(+3)
E)(+)

Question 5

When NF₃ reacts with BF₃ to form F₃NBF₃,

A)a complex ion is formed.
B)an ionic bond is formed.
C)the bond is formed by sharing an electron from NF₃ and an electron from BF₃.
D)a coordinate covalent bond is formed.
E)a covalent bond is formed.

Question 6

A coordinate covalent bond forms when a chemical species

A)donates one electron to another species to form a covalent bond.
B)accepts a pair of electrons and becomes an anion.
C)accepts one electron from another species to form a covalent bond.
D)accepts an electron and becomes an anion.
E)donates a pair of electrons to another species to form a covalent bond.

Question 7

A Lewis acid is any species capable of _____an electron pair.

A)accepting
B)donating
C)creating
D)neutralizing
E)losing

Question 8

A Lewis base is

A)an electron-pair donor.
B)an electron-pair acceptor.
C)a proton donor.
D)a proton acceptor.
E)never viewed also as a Brønsted-Lowry base.

Question 9

What is the oxidation state of cobalt in the [Co (NH₃)₄Cl₂]⁺ complex ion?

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

Question 10

Prussian blue has an idealized chemical formula of Fe₄[Fe(CN)₆]₃.What is the charge on the iron atom in the complex ion? (Note: The charge on the iron counter ions is an integer.)

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

Question 11

Which of the following statements regarding complex ions and coordination compounds is NOT correct?

A)Ligands function as electron pair donors.
B)A metal cation acts as a Lewis acid in a complex ion.
C)Ligands occupy the inner coordination sphere of the cation.
D)The coordination number refers to the number of electron pairs surrounding a metal ion in a complex.
E)Counter ions form coordinate covalent bonds with the ligands in a complex.

Question 12

How many ions are formed when [Co(NH₃)₅Cl]Cl₂ dissolves in water?

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

Question 13

Which of the following releases the most ions when dissolved in water?

A)[Co (NH₃)₄Cl₂](NO₃)₂
B)[Ni(NH₃)₅(H₂O)]Cl₂
C)Pt (NH₃)₃Cl₄
D)K₃[Fe(C₂O₄)₃]
E)Na₄[Fe(CN)₆]

Question 14

What is the coordination number for [Pt(NH₃)₄]Cl₂?

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

Question 15

Prussian blue has an idealized chemical formula of Fe₄[Fe(CN)₆]₃.What is the charge on the counter ions? (Note: The charge on the iron ion in the complex ion is an integer.)

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

Question 16

Identify the Lewis base in the following reaction:
SO₂(g) +H₂O(l) $\rightarrow$ H₂SO₃(aq)

A)SO₂
B)H₂O
C)H₂SO₃
D)None of these is a base.
E)All of these are bases.

Question 17

What is the oxidation state of nickel in tetracarbonylnickel, Ni(CO)₄?

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

Question 18

Which of the following species is a Lewis base?

A)H⁺
B)Cs⁺
C)NF₃
D)NF₄⁺
E)NH₄⁺

Question 19

A Lewis base is any species capable of ______an electron pair.

A)accepting
B)donating
C)creating
D)neutralizing
E)gaining

Question 20

A ligand is any ______ forming a coordinate bond to a metal cation.

A)Lewis acid
B)ion
C)Lewis base
D)organic compound
E)species

Question 21

The correct name for [Co(NH₃)₅Cl]Cl₂ is

A)chloropentamminecobalt(III) chloride.
B)pentamminechlorocobalt(II) chloride.
C)pentamminechlorocobalt(III) chloride.
D)pentamminechlorocobaltate(III) chloride.
E)pentamminedichlorocobalt(III).

Question 22

What is the coordination number around the Co ion in [Co(NH₃)₆][CrF₆]?

A)2
B)1
C)6
D)5
E)7

Question 23

The correct name for [Co(NH₃)₆][Cr(CN)₆] is

A)cobaltammine chromiumcyanide.
B)hexamminecobalt(III) hexacyanochromateI(I).
C)hexamminecobaltate(III) hexacyanochromium(III).
D)hexamminecobalt(III) hexacyanochromate(III).
E)hexamminecobalt(II) hexacyanochromate(III).

Question 24

What is the chemical formula of aminetrichloroplatinate (II)?

A)[Pt₂(NH₃)Cl₃]^-
B)[Pt(NH₃)₃Cl]^-
C)[Pt(NH₃)Cl₃]^2-
D)[Pt(NH₃)Cl₃]^-
E)[Pt(NH₃)Cl₃]^-.

Question 25

Ethylenediamine is an example of a ______ligand.

A)tridentate
B)hexadentate
C)bidentate
D)pentadentate
E)hydrocarbon

Question 26

Which one of the following compounds is called diamminetriaquahydroxochromium(II) nitrate?

A)[Cr(NH₃)₂(H₂O)₃(OH)](NO₃)₂
B)[Cr(NH₃)₂(H₂O)₃(OH)]NO₃
C)[Cr(NH₃)₂H₂O)₃](OH)NO₃
D)[Cr(NH₃)₂(OH)]NO_{3 •} 3H₂O
E)[Cr(NH₃)₂NO₃]OH(aq)

Question 27

The correct formula for ammonium tetracyanoplatinate(II) is

A)(NH₃)₂[Pt(CN)₄].
B)(NH₄)₂[Pt(CN)₄].
C)(NH₄)₂Pt(CN)₄.
D)(NH₄)₂[Pt(CN)₆].
E)(NH₄[Pt(CN)₄].

Question 28

What is the correct formula for sodium tetracyanodihydroxovanadate(II)?

A)Na₂[V(CN)₄(OH)₂]
B)Na₃[V(CN)₄(OH)₂]
C)Na₄[V(CN)₄(OH)₂]
D)Na[V(CN)₄(OH)₂]
E)Na₃[V(CN)₄(OH)]

Question 29

What is the correct formula for hexamminecobalt(III) nitrite?

A)[Co(NH₃)₆](NO₃)₃
B)Co(NH₃)₆(NO₂)₃
C)[Co(NH₃)₆](NO₂)₃
D)[Co(NH₃)₆](NO₂)₂
E)[Co(NH₃)₆](NO₃)₂

Question 30

For the coordination compound K₃[Fe(CN)₆], identify, in order, the charge on the complex ion, the oxidation state of the metal, and the coordination number of the metal.

A)(+3; -3; 6)
B)0; 0; 6
C)(-3; +3; 3)
D)(-3; +3; 6)
E)None of these choices is correct.

Question 31

The correct name for the compound [Fe(NH₃)₅H₂O](NO₃)₂ is

A)pentammineaquairon(II) nitrate.
B)pentammineaquairon(III) nitrate.
C)pentammineaquaferrate(II) nitrate.
D)aquapentammineiron(II) nitrate.
E)pentamineaquadinitroironIII).

Question 32

The correct name for the complex ion [Co(NH₃)₅Cl]^2- is

A)pentamminechlorocobaltate(III).
B)pentamminechlorocobalt(II).
C)chloropentamminecobalt(III).
D)pentamminechlorocobalt(III).
E)pentamminechlorocobalt.

Question 33

For the coordination compound K₃[ZrF₇], identify, in order, the charge on the complex ion, the oxidation state of the metal, and the coordination number of the metal.

A)(-3; +4; 7)
B)(-3; +7; 3)
C)(+3;-4; 7)
D)(+4; -7; 3)
E)None of these choices is correct.

Question 34

Which is the correct formula for potassium hexacyanoferrate(II)?

A)K[Fe(CN)₂]
B)K₄[Fe(CN)₆]
C)K₃[Fe(CN)₆]
D)K₂[Fe(CN)₂]
E)K₆[Fe(CN)₆]

Question 35

What is the coordination number around the Cr ion in [Co(NH₃)₆][CrF₆]?

A)2
B)1
C)6
D)5
E)7

Question 36

What is the coordination number for copper in the compound K₂[CuCl₄]?

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

Question 37

What is the coordination number of the metal atom in the complex ion in K[Pt(NH₃)Cl₅]?

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

Question 38

The correct name for K₂[CuCl₄] is

A)potassium copper chloride.
B)potassium tetrachlorocuprate(II).
C)dipotassium chlorocuprate(II).
D)potassium tetrachlorocopper(II).
E)dipotassium tetrachlorocopper(II).

Question 39

For the coordination compound [Zn(NH₃)₄]Cl₂, identify, in order, the charge on the complex ion, the coordination number of the metal, and the number of counter ions present.

A)(-2; 4; 2)
B)(+2; 4; 4)
C)(+4; 6; 0)
D)(+4; 4; 2)
E)None of these choices is correct.

Question 40

Which is the correct formula for pentaamminecyanocobalt(III) chloride?

A)[Co(NH₃)₅CN]Cl₂
B)[Co(NH₃)₅CN]Cl₃
C)[Co(NH₃)₅Cl]CN)₂
D)[Co(NH₃)₅CNO]Cl₂
E)[Co(NH₃)₅CNO]Cl₃

Question 41

In a tetrahedral crystal field,

A)d_xy, d_xz, and d_yz are lower in energy than d_x²-y² and d_z².
B)d_x2-y² and d_z2 are lower in energy than d_xy, d_xz, and d_yz.
C)d_xy, d_xz, d_yz, d_x²-0 y², and d_z2 all have different energies.
D)d_xy, d_xz, d_yz, d_x²-y², and d_z² all have the same energy.
E)d_xy, d_xz, and d_yz have the same energy, and d_x2-y² and d_z² have different energies.

Question 42

The reaction, where en represents ethylenediamine, has a small value for the enthalpy change, $\Delta$ H_rxn, yet the equilibrium constant for this reaction is large because

A)the reaction rate is fast.
B)the entropy change is large and positive.
C)the enthalpy change is large enough to matter.
D)the entropy change is large and negative.
E)the equilibrium constant does not depend on the enthalpy change.

Question 43

The greater affinity of metal ions for polydentate ligands than for monodentate ligands is known as the _______effect.

A)dentate
B)ligand
C)chelate
D)Lewis base
E)Lewis acid

Question 44

Which atoms on EDTA bond to metal ions?

A)carbon and oxygen
B)carbon and nitrogen
C)oxygen and nitrogen
D)nitrogen and hydrogen
E)oxygen and hydrogen

Question 45

Transition metals with_______ tend to form square planar complexes.

A)d 8 and d 9 configurations
B)d 1 and d 2 configurations
C)half-filled d orbitals
D)high spin
E)no d electrons

Question 46

When a molecule of ethylenediamine replaces two molecules of NH₃ in Co(NH₃)₆^3-, the entropy of the system

A)increases.
B)decreases.
C)remains the same.
D)cannot be determined.
E)is irrelevant.

Question 47

The d_z2 and d_x2-y2 orbitals are higher in energy than the d_xy, d_xz, and d_yz orbitals in an octahedral complex because these two orbitals

A)do not point directly at ligands.
B)point directly at ligands.
C)occupy larger volumes than the other three orbitals.
D)are in the same plane and repel one another.
E)occupy smaller volumes than the other three orbitals.

Question 48

The d_xy, d_xz, and d_yz orbitals are lower in energy than the d_z2 and d 2 2 orbitals in an octahedral complex because these three orbitals

A)do not point directly at ligands.
B)point directly at ligands.
C)occupy larger volumes than the other two orbitals.
D)are in the same plane and repel one another.
E)occupy smaller volumes than the other two orbitals.

Question 49

Which of the following is a chelation agent?

A)EDTA
B)Cl^-
C)NH₂
D)SCN^-
E)CN^-

Question 50

EDTA is an example of a _____ligand.

A)tridentate
B)hexadentate
C)tetradentate
D)pentadentate
E)hydrocarbon

Question 51

Oxalic acid is a dicarboxylic acid with the structure HOOCCOOH.How many coordination sites does the ion (OOCCOO)2- have?

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

Question 52

How many chelation sites and donor groups does EDTA have?

A)2
B)10
C)6
D)4
E)5

Question 53

Which d orbitals) is/are highest in energy in a tetrahedral complex?

A)d_z2
B)d_xy, d_xz, and d_yz
C)d_z² and
D)11ee34ea_62da_ec1f_b797_4f3e5b0d5d55_TB6562_00
E)d_xy and d_xz

Question 54

When the five 3d orbitals on a metal ion experience an octahedral field in a complex, they split into________ energy levels.

A)two
B)three
C)four
D)five
E)six

Question 55

Which d orbitals have a higher energy in an octahedral complex?

A)d_xy and d_xz
B)d_z2 and d_yz
C)d_z2 and
D)
E)d_xy, d_xz, and d_yz

Question 56

Which statement describing the splitting of metal d orbitals in an octahedral field is NOT correct?

A)The d orbitals are split into two energy levels.
B)One energy level contains three orbitals.
C)One energy level contains two orbitals.
D)The d_xy, d_xz, and d_yz orbitals have the lowest energy.
E)Photons cannot produce electronic transitions from one energy level to another.

Question 57

The interaction of a metal ion with a ligand having multiple atoms able to form coordinate covalent bonds is called

A)coordinating.
B)clawing.
C)precipitation.
D)chelation.
E)neutralization.

Question 58

Nickel ions, Ni²⁺, should have the greatest affinity for

A)water.
B)ammonia.
C)chloride.
D)diethylenetriamine.
E)oxalate.

Question 59

The reaction, , where en represents ethylenediamine, has a small value for the enthalpy change, $\Delta$ H_rxn, yet the free-energy change is large because

A)the reaction rate is fast.
B)the entropy change is large and positive.
C)the enthalpy change is large enough to matter.
D)the entropy change is large and negative.
E)ethylenediamine has amino groups that are stronger bases than ammonia.

Question 60

Crystal field theory describes

A)how ligands cause the metal d orbitals to have different energies.
B)the covalent bonding in transition metal complexes.
C)how d orbitals change their shapes when ligands are present.
D)how metal s, p, and d orbitals are hybridized to bond with ligands.
E)the molecular orbitals that describe the bonding in transition metal complexes.

Question 61

How many d electrons are there in the chromiumIII) ion?

A)0
B)3
C)4
D)5
E)2

Question 62

Co(NH₃)₆3+(aq) absorbs light in the blue region of the spectrum.The color of a solution containing this ion is

A)blue.
B)blue-violet.
C)violet.
D)yellow-orange.
E)red.

Question 63

How many unpaired electrons are there in the weak-field complex ion[CoS(CN)₄]^2-?

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

Question 64

Which of the following complexes has the smallest crystal field splitting of the d orbitals?

A)CoF₆^3-
B)Co(CN) ^3-
C)CoBr ^3- ₆
D)CoH₂O) ^3-₆
E)CoI ^3- ₆

Question 65

Which of the following complexes has the largest crystal field splitting of the d orbitals?

A)CoF₆3-
B)Co(CN) 3-
C)CoBr ^3-
D)Co(H₂O) ^3-₆
E)CoI ^3- ₆

Question 66

As the value of the crystal field splitting, $\Delta$ o , increases from one complex ion to another,

A)the wavelength of absorbed light increases.
B)the wavelength of absorbed light decreases.
C)the number of d electrons increases.
D)the number of d electrons decreases.
E)the color of the solution shifts from red toward blue.

Question 67

How many unpaired electrons are there in the octahedral complex ionMn(CN)₆4- ?

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

Question 68

CoF₆^3-absorbs light in the red region of the spectrum, whereas Co(NH₃)₆³⁺⁰ absorbs light on the blue region of the spectrum.This difference means that

A)the splitting of the d orbitals of the two complexes is nearly identical.
B)the value of the crystal field splitting is very small for both complexes.
C)the crystal field splitting is larger for the ammonia complex than for the fluoride complex.
D)the d_z² and orbitals are higher in energy than the d_xy, d_xz, and d_yz orbitals in CoF₆^3- and just the opposite splitting order for Co(NH₃)₆^3-.
E)the d_z2 and d_x2-y2 orbitals are lower in energy than the d_xy, d_xz, and d_yz orbitals in CoF₆3- and just the opposite splitting order for Co(NH₃)₆^3-.

Question 69

Complex ions with different ligands have different colors because the ligands

A)are different colors.
B)affect the energy levels of the lone-pair electrons on the metal.
C)have different energies for their bonding electrons.
D)affect the energy levels of the metal d orbitals.
E)have different energies for their lone-pair electrons.

Question 70

Given that the observed absorption maximum for the complex ion CoF₆^3- in solution is $\Delta$ _max = 700 nm, what is the value of the crystal field splitting, $\Delta$ o ?

A)3 * 10^-19 J
B)3 * 10^-28 J
C)7 *10³⁰ J
D)3 * 10^-36 J
E)7 * 10^-19 J

Question 71

How many unpaired electrons are there in a strong-field octahedral Fe3+complex?

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

Question 72

Transition metal ions often absorb visible light in promoting electrons from a ground state to an excited state.Why doesn't aluminum(III) ion have this property?

A)It does, and this fact accounts for the color of some gemstones.
B)Aluminum(III) has a noble gas configuration-that of argon.
C)Aluminum(III) has no d electrons.
D)Aluminum(III) has a filled d subshell.
E)The crystal field splitting of the d orbitals in aluminum(III) is very large.

Question 73

Which 3d orbitals have a higher energy in an octahedral crystal field?

A)d_xy and d_xz
B)d_z2 and d_yz
C)d_z2 and

D)
E)d_xy, d_xz, and d_yz

Question 74

Which of the following species most likely would be expected to be in a high-spin state?

A)Co(CN)₆^3-
B)Co(H₂O)₆^3+F10
C)CoF₆^3-
D)Mn(CN)₆^4-
E)Co(NO₂)₆^3-10

Question 75

A transition metal complex ion with octahedral geometry has a value of 4.4 * 10^-19 J for the crystal field splitting, $\Delta$ o .What is the wavelength for the absorption maximum, $\Delta$ _max for this complex ion?

A)5.0 * 10^-15 nm
B)450 nm
C)4.5 *10^-16 nm
D)520 mm
E)640 nm

Question 76

Which of the following ligands will cause the smallest crystal field splitting of the d orbitals in an octahedral complex?

A)H₂O
B)Br^-
C)NH₃
D)CN^-
E)I^-

Question 77

A strong crystal field produces a large value for the crystal field splitting, $\Delta$ o , whereas a weak crystal field produces a small crystal field splitting.Which complex ion most likely contains a metal ion in a low-spin configuration?

A)[NiBr₄] ^{2 -}
B)[Fe(H₂O)₆]^{2 +}
C)[CoF₆]^3?2
D)[Cr(H₂O)₂Cl₄] ^{2 -}
E)[Co(CN)₆]^{3 +}

Question 78

Which of the following metal ions can only have one spin state regardless of the ligand in an octahedral complex?

A)Cu²⁺
B)CO^₃+
C)CO^₂+
D)MN^₂+
E)Mn³⁺

Question 79

Which of the following ligands will cause the largest crystal field splitting of the d orbitals in an octahedral complex?

A)H₂O
B)Br^-
C)NH₃
D)CN^-
E)I^-

Question 80

Which of the following transition metal ions would have the greater $\Delta$ o value when the same ligand was bound to the ions?

A)CO_³ +
B)RH³⁺
C)CO₂ +
D)Ir^{3 +}
E)They have the same $\Delta$ o value.