Deck 19: Transition Metals, Coordination Chemistry and Metallurgy

Question 1

In coordination compounds, the term used to
Refer to the number of ligands bound to the metal is:

A) oxidation state.
B) complexation.
C) coordination number.
D) hydration number.
E) none of these.

Answer 1

coordination number.

Question 2

Which metal has the largest heat of vaporization?

A) K
B) Na
C) Cu
D) Cr
E) Al

Answer 2

Cr

Question 3

The name of the coordination compound Na[FeCl₄] is:

A) sodium tetrachloroiron.
B) sodium tetrachloroferrate(III).
C) sodium tetrachloroironate(I).
D) sodium iron chloride.
E) none of these.

Answer 3

sodium tetrachloroferrate(III).

Question 4

What is the oxidation state of cobalt in the compound [Co(NH₃)₄Cl₂]Cl?

A) +1
B) +2
C) +3
D) +6
E) none of these

Question 5

What is the oxidation state of the ruthenium ion in the compound, K₂[RuCl₅(H₂O)]?

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

Question 6

Which of these metals is not a transition element?

A) Ti
B) Cr
C) Ca
D) La
E) Fe

Question 7

Which of these transition elements has the largest atomic radius?

A) Ti
B) Fe
C) Mn
D) Hf
E) Re

Question 8

What is the coordination number of the central atom in the coordination compound [Co(en)₂Br₂]⁺?
(en = H₂NCH₂CH₂NH₂)

A) 4
B) 6
C) 8
D) 12
E) 26

Question 9

The maximum oxidation state of a transition metal is usually observed when it is combined with:

A) another transition metal.
B) oxygen or fluorine.
C) alkali metals.
D) bromine or iodine.
E) none of these

Question 10

Which metal listed below has the highest melting point?

A) Na
B) K
C) Cu
D) Cr
E) Ti

Question 11

The highest oxidation state expected for Ti is:

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

Question 12

Given the three statements below, select the correct choice.
I. The lanthanide contraction causes Nb and Ta to have the same atomic radius.
II. The lanthanide contraction causes the radius of Zr to be greater than the radius of Ti.
III. The lanthanide contraction causes the first ionization energy of W to be larger than that of Mo.

A) I and II are true, III is false
B) I and III are true, II is false
C) II and III are true, I is false
D) only I is true
E) none of these

Question 13

What is the oxidation state of the nickel ion in the compound [Ni(CO)₄]?

A) - 4
B) - 2
C) 0
D) +2
E) +4

Question 14

What is the coordination number of the central atom in the coordination compound [Pt(NH₃)₄Cl₂]SO₄?

A) 6
B) 2
C) 3
D) 4
E) 18

Question 15

Which of these metals is not a transition element?

A) V
B) W
C) Fe
D) Cu
E) Al

Question 16

The formula of potassium pentacyanocarbonylcobaltate(III) is:

A) K₃[Co(CN)₅CO]
B) K₂Co(CN)₅ × CO
C) K₂[Co(CN)₅CO]
D) K₄[Co(CN)₅CO₃]
E) none of these

Question 17

Which of the statements are true of ligands?

A) Ligands are Lewis bases.
B) Ligands are always anions.
C) Ligands only bond to a metal through a single atom.
D) Ligands accept electron pairs from the metal when forming bonds.
E) None of these.

Question 18

Which of these transition elements has the largest atomic radius?

A) Cr
B) Co
C) Ta
D) Re
E) Os

Question 19

The highest oxidation state expected for Nb is:

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

Question 20

Which of these metals is not a transition element?

A) Hf
B) Co
C) Cu
D) Zn
E) Pt

Question 21

Which of the following ligands might form chelates with a metal ion?

A) Cl ^-
B) NH3
C) SCN ^-
D) C₂O₄^{2 -}
E) none of these

Question 22

What is the formula for the compound Sodium aquapentacyanocobaltate(III)?

A) Na[Co(CN)₅] (aq)
B) Na₂[Co(CN)₅H₂O]
C) Na₃[Co(CN)₅H₂O]
D) Na[Co(CN)H₂O]₅
E) None of these

Question 23

What is the IUPAC name for the coordination compound with a formula of [Ni(CO)₄]?

A) Nickel tetra(carbon monoxide)
B) Nickel tetracarbonyl
C) Tetracarbonylnickel(0)
D) Tetra(carbon monoxide)nickel(IV)
E) Tetra(Nickelcarbonyl)

Question 24

In which of the complexes are optical isomers possible?

A) [Cr(C₂O₄)₃]^{3 -}
B) [Co(en)₃]³⁺
C) [Pt(NH₃)₂Cl₂Br₂]
D) none of these three
E) all of these three

Question 25

How are the two compounds that are shown below related?

A) They are the same compound.
B) They are optical isomers.
C) They are structural coordination isomers.
D) They are structural linkage isomers.
E) They are geometric isomers.

Question 26

Which pair of isomers is an example of coordination isomerism?

A) [Pt(NH₃)₄Br₂]Cl₂, [Pt(NH₃)₄Cl₂]Br₂
B)
C) cis -[Pt(NH₃)₂Cl₂], trans -[Pt(NH₃)₂Cl₂]
D)
E) none of these

Question 27

Which of the following ligands is considered bidentate ?
I. H₂O
II. oxalate, C₂O₄^{2 -}
III. ethylenediamine, H₂NCH₂CH₂NH₂

A) I only
B) II only
C) III only
D) I and II
E) II and III

Question 28

What is the formula for the compound Triamminetrichlorocobalt(III)?

A) [Co(NH₂)₃]Cl₃
B) Co(NH₃)₃Cl₃
C) [Co(NH₃)₃Cl₂]Cl
D) [Co(NH₃)₃Cl]Cl₂
E) [Co(NH₃)₃]Cl₃

Question 29

Which of the following cannot behave as a ligand?

A) NH₄⁺
B) H₂O
C) CN ^-
D) OH ^-
E) C₂O₄^{2 -}

Question 30

What is the IUPAC name for the coordination compound with a formula of [Co(NH₃)₅Br]Br₂?

A) Pentaamminebromocobalt(III) bromide
B) Pentaamminetribromocobalt(III)
C) Pentaammoniacobalt(III) tribromide
D) Cobaltpentaamminebromo dibromide
E) Cobaltpentaammoniumbromo bromine

Question 31

A ligand that forms complexes that exhibit linkage isomerism is:

A) Cl ^-
B) C₂O₄ ^-
C) ethylenediamine, [NH₂(CH₂)₂NH₂]
D) NO₂ ^-
E) none of these

Question 32

How are the two compounds that are shown below related?

A) They are the same compound.
B) They are optical isomers.
C) They are structural coordination isomers.
D) They are structural linkage isomers.
E) They are geometric isomers.

Question 33

How are the two compounds that are shown below related?

A) They are the same compound.
B) They are optical isomers.
C) They are structural coordination isomers.
D) They are structural linkage isomers.
E) They are geometric isomers.

Question 34

A coordination complex that can have two geometric isomers is:

A) [Co(NH₃)₅NO₂]²⁺
B) [Co(en)₂Cl₂]⁺
C) [Pt(NH₃)₃SCN]⁺
D) [Cr(H₂O)₆]³⁺
E) none of these

Question 35

How are the compounds [Co(NH₃)₄Cl₂]Br and [Co(NH₃)₄BrCl]Cl related?

A) They are the same compound.
B) They are optical isomers.
C) They are structural coordination isomers.
D) They are structural linkage isomers.
E) They are geometric isomers.

Question 36

How many geometric isomers are possible for the octahedral complex [Ru(H₂O)₂Cl₄] ^- ?

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

Question 37

What is the IUPAC name for the coordination compound with a formula of K₃[Fe(CN)₆]?

A) Tripotassium iron hexacyanide
B) Tripotassium iron(III) cyanide
C) Potassium hexacyanoferrate (III)
D) Potassium hexacyanoiron(III)
E) Tripotassium hexa(iron cyanide)

Question 38

A complex that can exhibit both geometric and optical isomerism is:

A) [Co(en)₃]³⁺
B) [Pt(NH₃)₂Cl₂]
C) [Co(en)₂Cl₂]⁺
D) [Co(en)₂(C₂O₄)]⁺
E) none of these

Question 39

The prefixes fac - and mer - are used to distinguish geometric isomers of octahedral complexes with which general formula?
(M = metal ion, A and B are monodentate ligands)

A) MA₅B
B) MA₄B₂
C) MA₃B₃
D) all of these three
E) none of these three

Question 40

Which coordination compound can exhibit geometric ( cis - trans ) isomerism?

A) [Pt(NH₃)₃Cl]⁺, square planar
B) [Zn(NH₃)₂Cl₂], tetrahedral
C) [Pt(NH₃)₂Cl₂], square planar
D) [Co(NH₃)₅Cl]⁺, octahedral
E) none of these

Question 41

The maximum number of unpaired electrons possible in any octahedral complex of a transition metal ion is:

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

Question 42

Using the spectrochemical series (order of increasing D ) Cl ^- , the complex that exhibits the largest value of D is:

A) Ir(CN)₆^{3 -}
B) IrCl₆^{3 -}
C) Co(CN)₆^{4 -}
D) Co(NH₃)₆²⁺
E) Co(CN)₆^{3 -}

Question 43

A titanium(III) complex (with a d¹ electron configuration) absorbs light at 530 nm. What is D , the crystal field splitting in this complex, expressed in kJ/mol?

A) 1.25×10 ^{- 27}
B) 3.75×10 ^{- 19}
C) 226
D) 2.26×10⁵
E) none of these

Question 44

With different ligands a particular transition metal ion forms octahedral complexes with either zero or four unpaired electrons. How many d electrons are present in the metal?

A) 6
B) 7
C) 8
D) 4
E) 5

Question 45

The paramagnetism in complex ions of transition metals such as CoF₆^{3 -} or NiCl₄^{2 -} is a result of:

A) the charge on the ions.
B) electron pair donation by the ligands.
C) unpaired d-orbital electrons on the metal ions.
D) the square planar geometry possible with these metals.
E) paired d-orbital electrons on the metal ions.

Question 46

Magnetic measurements on an octahedral complex of a transition metal show that it contains three unpaired electrons. Which of the following d-electron configurations of the metal ion are consistent with this fact?
Select the most complete answer.

A) d³
B) d³ and d⁷
C) d³, d⁵, and d⁷
D) d³, d⁵, d⁷, and d⁹
E) any d-electron configuration

Question 47

Magnetic measurements on an octahedral complex of a transition metal ion show that it contains one unpaired electron. Which of the following d-electron configurations of the metal ion are consistent with this fact?
Select the most complete answer.

A) d¹
B) d¹ and d⁹
C) d⁵ and d⁷
D) d¹, d⁵, d⁷, and d⁹
E) any d-electron configuration

Question 48

A titanium(III) complex (with a d¹ electron configuration) absorbs light at 480 nm. What is D , the crystal field splitting in this complex, expressed in kJ/mol?

A) 1.38×10 ^{- 27}
B) 4.14×10 ^{- 19}
C) 250
D) 2.50×10⁵
E) none of these

Question 49

The species [RhCl₆]^{3 -} is considered a strong field, low spin complex. Which statement below is true regarding this complex?

A) The metal ion in this complex has a d³ electronic configuration with 1 unpaired electron.
B) The metal ion in this complex has a d³ electronic configuration witH ₃unpaired electrons.
C) The metal ion in this complex has a d⁶ electronic configuration with 0 unpaired electrons.
D) The metal ion in this complex has a d⁶ electronic configuration witH₄ unpaired electrons.
E) The metal ion in this complex has a d⁹ electronic configuration with 1 unpaired electron.

Question 50

An octahedral complex of a d¹ transition metal complex has D = 220 kJ/mol. At what wavelength does this complex absorb light?

A) 3.65×10 ^{- 19} m
B) 5.51×10¹⁴ m
C) 1.81×10 ^{- 15} m
D) 5.44×10 ^{- 7} m
E) none of these

Question 51

Which of the following complexes has the largest value of the crystal field splitting ( D )?

A) FeCl₄ ^- (tetrahedral)
B) RuCl₆^{3 -}
C) OsCl₆^{3 -}
D) OsCl₆^{4 -}
E) cannot be predicted

Question 52

The species [Cr(CN)₆]^{4 -} is considered a strong field, low spin complex. Which statement below is true regarding this complex?

A) The metal ion in this complex has a d² electronic configuration witH₂ unpaired electrons.
B) The metal ion in this complex has a d² electronic configuration with 0 unpaired electrons.
C) The metal ion in this complex has a d⁴ electronic configuration witH₂ unpaired electrons.
D) The metal ion in this complex has a d⁴ electronic configuration witH₄ unpaired electrons.
E) The metal ion in this complex has a d⁶ electronic configuration with 0 unpaired electrons.

Question 53

Magnetic measurements on an octahedral complex of a transition metal ion show that it contains two unpaired electrons. Which of the following d-electron configurations of the metal ion are consistent with this fact?
Select the most complete answer.

A) d²
B) d² and d⁸
C) d⁴ and d⁶
D) d², d⁴, and d⁸
E) any d-electron configuration

Question 54

With different ligands a particular transition metal ion forms octahedral complexes with either two or four unpaired electrons. How many d electrons are present in this metal ion?

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

Question 55

With different ligands a particular transition metal ion forms octahedral complexes with either one or three unpaired electrons. How many d electrons are present in the metal?

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

Question 56

An octahedral complex of a d¹ transition metal complex has D = 203 kJ/mol. At what wavelength does this complex absorb light?

A) 5.08×10¹⁴ m
B) 5.90×10 ^{- 7} m
C) 1.97×10 ^{- 15} m
D) 3.37×10 ^{- 19} m
E) none of these

Question 57

The species [FeF₆]^{3 -} is considered a weak field, high spin complex. Which statement below is true regarding this complex?

A) The metal ion in this complex has a d³ electronic configuration witH ₃unpaired electrons.
B) The metal ion in this complex has a d³ electronic configuration with 1 unpaired electron.
C) The metal ion in this complex has a d⁵ electronic configuration witH₅ unpaired electrons.
D) The metal ion in this complex has a d⁵ electronic configuration with 1 unpaired electron.
E) The metal ion in this complex has a d⁸ electronic configuration with 0 unpaired electrons.

Question 58

Magnetic measurements on an octahedral complex of a transition metal ion show that it contains four unpaired electrons. Which of the following d-electron configurations of the metal ion are consistent with this fact?
Select the most complete answer.

A) d⁴
B) d⁴ and d⁸
C) d⁴ and d⁶
D) d⁴, d⁶, and d⁸
E) any d-electron configuration

Question 59

Using the spectrochemical series (order of increasing D ) Cl ^- , which metal complex absorbs light at the longest wavelength (lowest energy)?

A) Co(H₂O)₆³⁺
B) Co(H₂O)₆²⁺
C) Co(CN)₆^{3 -}
D) Rh(NH₃)₆²⁺
E) Rh(CN)₆²⁺

Question 60

With different ligands a particular transition metal ion forms octahedral complexes with either one or five unpaired electrons. How many d electrons are present in the metal?

A) 6
B) 7
C) 2
D) 4
E) 5

Question 61

Arrange the three complexes listed below in order of increasing crystal field energy , Δ . [Fe(H₂O)₆]³⁺ [Fe(H₂O)₆]²⁺ [Ru(H₂O)₆]³⁺

A) (smallest Δ ) [Fe(H₂O)₆]³+ < [Fe(H₂O)₆]²+ < [Ru(H₂O)₆]³+ (greatest Δ)
B) (smallest Δ ) [Fe(H₂O)₆]²+ < [Fe(H₂O)₆]³+ < [Ru(H₂O)₆]³+ (greatest Δ)
C) (smallest Δ ) [Ru(H₂O)₆]³+ < [Fe(H₂O)₆]³+ < [Fe(H₂O)₆]²+ (greatest Δ)
D) (smallest Δ ) [Ru(H₂O)₆]³+ < [Fe(H₂O)₆]²+ < [Fe(H₂O)₆]³+ (greatest Δ)
E) (smallest Δ ) [Fe(H₂O)₆]³+ < [Ru(H₂O)₆]³+ < [Fe(H₂O)₆]²+ (greatest Δ)

Question 62

Which metal ion would have the largest value of D , when all are coordinated by the same ligands?

A) Re²⁺
B) Re³⁺
C) Tc³⁺
D) Mn²⁺
E) Mn³⁺

Question 63

Which of the following lists of metals all occur in nature as the free elements?

A) alkali metals
B) alkaline earth metals
C) Zn, Cd, Hg
D) Fe, Cr, Mn
E) Au, Pt, Ir

Question 64

Most metallic elements occur in nature:

A) as the free element.
B) in a positive oxidation state.
C) in a negative oxidation state.
D) as liquids.
E) none of these

Question 65

Consider the following statements:
I. D increases with increasing charge on a given transition metal.
II. For metal ions of the same charge, D increases down a group in the periodic table.
III. D is independent of the particular ligands in a complex. Which of these statements are true?

A) I only
B) II only
C) I and II
D) I and III
E) all of these

Question 66

Sulfide ores are roasted to:

A) separate the metal sulfide from other components.
B) remove volatile impurities from the ore.
C) convert the metal sulfides to metal oxides.
D) increase the oxidation state of the metal.
E) none of these.

Question 67

In the blast furnace, iron oxides are reduced by:

A) calcium carbonate.
B) carbon monoxide.
C) carbon dioxide.
D) all of these.
E) none of these.

Question 68

In the oxygen furnace, impurities in iron are removed by:

A) oxidizing the non-metals such as C, Si and P.
B) vaporization of the impurities.
C) precipitation of impurities from aqueous solution.
D) fractional crystallization.
E) none of these.

Question 69

In the electrorefining process the impure metal is:

A) initially present in solution.
B) the cathode in an electrolysis cell.
C) the anode in an electrolysis cell.
D) preferentially reduced.
E) none of these

Question 70

The concentration of ores by flotation takes advantage of differences in:

A) the densities of the components.
B) the chemical properties of the components.
C) the melting points of the components.
D) the solubilities of the components.
E) none of these.

Question 71

Aluminum ores are treated with base to separate the aluminum from iron compounds. Which of the following chemical properties is important in this separation?

A) Aluminum is more easily oxidized than is iron.
B) The iron is reduced to the solid metal in basic solution.
C) Aluminum sulfide decomposes in basic solution, but iron sulfide does not.
D) Aluminum oxide is amphoteric and dissolves in base.
E) none of these

Question 72

Which of the following methods are used for the purification of metals?
I. distillation
II. zone refining
III. electrolysis

A) I and II only
B) II and III only
C) I and III only
D) I, II, and III
E) none of I, II, and III

Question 73

When possible the preferred method of reduction of metals in ores is:

A) electrolysis.
B) displacement with a more reactive metal.
C) to use carbon as a reducing agent.
D) the formation of amalgams.
E) dependent on the impurities present in the ore.