Chapter.21 Exam Questions Metal Complexes - Solution Bank | Chemistry Molecular Nature 8e by Neil D. Jespersen. DOCX document preview.
Chemistry: Molecular Nature of Matter, 8e (Jespersen)
Chapter 21 Metal Complexes
1) Which statement below about ligands that form coordination complexes with transition metals is false?
A) A ligand that attaches itself to a metal ion is acting as a Lewis acid.
B) Neutral molecules can function as ligands and can form coordination complexes with transition metal ions.
C) Anions can function as ligands and can form coordination complexes with transition metal ions.
D) The ligand in a coordination complex contains a particular atom which functions as the donor atom.
E) The bond between the ligand and the transition metal ion in a coordination complex is a coordinate covalent bond.
Diff: 1
Section: 21.1
2) Which of the following is true of all ligands?
A) Ligands can only form one bond with a metal ion.
B) Stronger ligands have a larger diameter.
C) Ligands must contain elements that have a very low electronegativity.
D) Ligands act as a Lewis base when they attach to a metal ion.
E) Ligands are electron deficient.
Diff: 1
Section: 21.1
3) The number of possible donor atoms in the EDTA4- (ethylenediaminetetraacetate) ligand is:
A) 2
B) 3
C) 4
D) 6
E) 8
Diff: 2
Section: 21.1
4) The number of possible donor atoms in each bidentate ligand, C2O42-, in the [Fe(C2O4)3]3- coordination complex ion is:
A) 2
B) 3
C) 4
D) 6
E) 8
Diff: 1
Section: 21.1
5) The charge on the metal ion in the coordination complex ion, [Co(CO3)3]3, is:
A) 0
B) 2+
C) 3
D) 3+
E) 6
Diff: 2
Section: 21.1
6) A coordination compound formed from cobalt(III) sulfate and ammonia contains six ammonia molecules as ligands. The formula of the compound is
A) Co2(SO4)3∙6NH3
B) [Co(NH3)6]2(SO4)3
C) Co3SO4(NH3)6
D) Co2(SO4)3(NH4)6
E) Co2[(NH3)6](SO4)3
Diff: 2
Section: 21.1
7) A coordination compound formed from chromium(III) chloride contains five ammonia molecules and one water molecule, which function as ligands. The coordination compound's formula is:
A) [Cr(NH3)5(H2O)]Cl3
B) Cr3Cl(NH3)5H2O
C) CrCl3∙5NH3∙H2O
D) Cr(NH3)5Cl3∙H2O
E) [Cr(NH3)5]Cl3∙H2O
Diff: 2
Section: 21.1
8) A compound contains a transition metal coordination complex. This coordination complex consists of one iron(III) ion with three C2O42- ions attached as ligands. Which formula below describes a compound that fits this description?
A) K3[Fe(C2O4)3]
B) Fe(C2O4)3
C) [Fe(C2O4)3]Cl3
D) Fe(C2O4)3](SO4)3
E) Ca3[Fe(C2O4)3]
Diff: 2
Section: 21.1
9) A complex ion is formed by a Co3+ ion, which is linked to one carbonate ion and four ammonia molecules. Which formula correctly represents a salt of this complex ion?
A) Na3[Co(NH3)4CO3]
B) Na[Co(NH3)4CO3]
C) [Co(NH3)4CO3]CO3
D) [Co(NH3)4CO3]Cl2
E) [Co(NH3)4CO3]2SO4
Diff: 2
Section: 21.1
10) A compound contains a transition metal coordination complex. This coordination complex consists of one cobalt(III) ion with five ammonia molecules and one cyanide ion attached as ligands. Which formula correctly describes a compound that would fit the description?
A) K4[CoCN(NH3)5]
B) K2[CoCN(NH3)5]
C) [CoCN(NH3)5](SO4)2
D) [CoCN(NH3)5]SO4
E) [CoCN(NH3)5]Cl3
Diff: 2
Section: 21.1
11) A compound contains a transition metal coordination complex. This coordination complex consists of one iron(III) ion with 3 ammonia molecules, one ethylenediamine (en) molecule, and one cyanide ion attached as ligands. Which formula correctly describes a compound that would fit the description?
A) K4[FeCN(NH3)3(en)2]
B) K2[FeCN(NH3)3(en)]
C) [Fe(CN)2(NH3)5(en)2](SO4)2
D) [FeCN(NH3)3(en)2]SO4
E) [Fe(en)CN(NH3)3]Cl3
Diff: 2
Section: 21.1
12) Which coordination complex would you expect to be the most stable?
A) Co(NH3)63+
B) CoF63
C) Co(en)33+
D) Co(dien)23+ dien = H2N–CH2–CH2–NH–CH2–CH2–NH2
E) Co(EDTA) EDTA = ethylenediaminetetraacetate
Diff: 2
Section: 21.1
13) Which of the following ligands would be the most difficult to remove from an iron(III) cation under similar conditions?
A) NH3
B) F
C) en
D) O2
E) EDTA4-
Diff: 2
Section: 21.1
14) EDTA4- (ethylenediaminetetraacetate anion), shown below, is capable of acting as a ________ ligand.
A) monodentate
B) bidentate
C) tridentate
D) tetradentate
E) polydentate
Diff: 2
Section: 21.1
15) How many donor atoms are on a monodentate ligand?
A) 0
B) 1
C) 2
D) 3
E) 4
Diff: 2
Section: 20.1
16) How many donor atoms are on a bidentate ligand?
A) 0
B) 1
C) 2
D) 3
E) 4
Diff: 2
Section: 20.1
17) How many bonds can a polydentate ligand form with a metal cation?
A) 0
B) 1
C) 2
D) 4
E) both C and D are possible
Diff: 2
Section: 20.1
18) Which species can function as a chelating ligand?
A) NH3
B) NH4+
C) CN-
D) CH3–CH2–CH2–NH2
E) NH2–CH2–CH2–NH2
Diff: 2
Section: 21.1
19) Which species can function as a chelating ligand?
A) NH3
B) NH4+
C) CN-
D) CH3–CH2–CH2–O–H
E) NH2–CH2–CH2–NH–CH3
Diff: 2
Section: 21.1
20) Which cobalt complex should be the most stable (having the largest formation constant)?
A) Co(NH3)62+
B) Co(NH3)63+
C) Co(H2O)62+
D) Co(F)63-
E) Co(en)33+
Diff: 2
Section: 21.1
21) The name for the complex ion, [Ni(CN)4]2, is:
A) tetracyanonickel(II)
B) nickel(II) tetracyanide
C) tetracyanonickelo(II)
D) tetracyanonickelate(II)
E) tetracyanonickelite(II)
Diff: 2
Section: 21.2
22) The name for the complex ion, [Co(NH3)6]3+, is
A) cobalt hexammine.
B) cobalt(III) hexamine.
C) hexamminecobaltate(III).
D) hexaminocobaltate(III).
E) hexamminecobalt(III).
Diff: 2
Section: 21.2
23) The name for the transition metal complex [Fe(CN)6]3- is
A) hexacyano ferrate(III).
B) hexacyanoiron(II).
C) iron(III) hexacyanide.
D) ferrous cyanide.
E) ferric cyanide.
Diff: 2
Section: 21.2
24) The name for the transition metal complex [Cr(H2O)6]Cl3 is
A) hexawaterchromium(III) chloride.
B) hexaaquachromium(III) trichloride.
C) hexaaquachromium(III) chloride.
D) chromium(III) aqua chloride.
E) chromium(III) chloride hexahydrate.
Diff: 2
Section: 21.2
25) The correct name for the transition metal complex [CoCl3(NH3)3] is
A) cobalt(III) chloride triammine.
B) triamminetrichlorocobalt(III).
C) triamminetrichlorocobalt(II).
D) cobalt ammonia chloride.
E) cobalt(III) ammonium chloride.
Diff: 2
Section: 21.2
26) The name for the complex ion, [AuCl4], is
A) gold tetrachloride.
B) gold(II) tetrachloride.
C) auric tetrachloride.
D) tetrachlorogold(III).
E) tetrachloroaurate(III).
Diff: 2
Section: 21.2
27) The correct name for the compound, [CrCl2(en)2]2C2O4, is
A) dichlorobis(ethylenediamine)chromium(III) oxalate.
B) bis(ethylenediamine)dichlorochromate(III) oxalate.
C) dichlorobis(ethylenediamine)oxalatochromium(III).
D) dichlorobis(ethylenediamine)oxalatochromate(III).
E) bis(dichlorobis(ethylenediamine)chromium(III)) oxalate.
Diff: 2
Section: 21.2
28) The compound, [Co(NH3)6]2[PtCl4]3, is named
A) cobalt(III) hexammine tetrachloroplatinate(II).
B) cobalt(II) hexammine tetrachloroplatinate(II).
C) cobalt(III) hexammine platinum(II) tetrachloride.
D) hexamminecobalt(III) tetrachloroplatinate(II).
E) hexamminecobalt(III) platinum(II) tetrachloride.
Diff: 2
Section: 21.2
29) The compound, (NH4)3[FeF6], is named
A) ammonium hexafluoroiron(III).
B) ammonium hexafluoroferrate(III).
C) ammonium iron(III) hexafluoride.
D) hexafluoroiron(III) ammonium.
E) triammonium hexafluoroiron(III).
Diff: 2
Section: 21.2
30) The coordination complex, [Co(NO2)(NH3)5]Cl2, is named
A) pentaamminenitrocobalt(III) chloride.
B) pentaamminenitritocobalt(II) chloride.
C) pentaamminenitrocobalt(II) chloride.
D) pentaamminenitritocobalt(III) chloride.
E) nitropentaamminecobalt(II) chloride.
Diff: 2
Section: 21.2
31) The coordination complex, [Co(NO2)(NH3)5]Cl2, is named
A) pentaamminenitrocobalt(III) chloride.
B) pentaamminenitritocobalt(II) chloride.
C) pentaamminenitrocobalt(II) chloride.
D) pentaamminenitritocobalt(III) chloride.
E) nitropentaamminecobalt(II) chloride.
Diff: 2
Section: 21.2
32) The metal complex, [Cr(en)3]Cl3, is named
A) tri(ethylenediamine)chromium(III) trichloride.
B) tri(ethylenediamine)chromium(III) chloride.
C) trichloro ethylenediaminechromate(III).
D) tris(ethylenediamine)chromium(III) chloride.
E) bis(ethylenediamine)chromium(III) trichloride.
Diff: 2
Section: 21.2
33) The complex ion, [Cr(dien)2]3+ is shown below. The coordination number of the chromium ion in the [Cr(dien)2]3+ is:
dien = 
A) 1
B) 2
C) 3
D) 4
E) 6
Diff: 2
Section: 21.3
34) The coordination number of Ag, in the following complex, is:
A) 1
B) 2
C) 3
D) 4
E) 5
Diff: 1
Section: 21.3
35) The coordination number of platinum in the complex ion, [Pt(C2O4)2]2, is:
A) 1
B) 2
C) 3
D) 4
E) 6
Diff: 1
Section: 21.3
36) The coordination number of platinum in the complex ion in the compound, [Pt(NH3)4]SO4, is:
A) 1
B) 2
C) 3
D) 4
E) 6
Diff: 1
Section: 21.3
37) The coordination number of the cobalt ion in the coordination complex ion present in [Co(Cl)(NH3)4(H2O)]Cl2, is:
A) 3
B) 4
C) 5
D) 6
E) 8
Diff: 1
Section: 21.3
38) The coordination number of the nickel ion in the complex ion, [Ni(en)3]2+, is:
(en = H2N―CH2―CH2―NH2)
A) 1
B) 2
C) 3
D) 4
E) 6
Diff: 1
Section: 21.3
39) The coordination number of the cobalt ion in the complex ion in the
[Co(Cl)(NH3)5]Cl2 compound is:
A) 1
B) 3
C) 5
D) 6
E) 8
Diff: 1
Section: 21.3
40) Cu2+ ion reacts with ammonia molecules to form the Cu(NH3)42+ ion.
Which statement below is true?
A) The copper ion is functioning as a Lewis base.
B) The ammonia molecule is functioning as an acceptor molecule.
C) The bond between the ammonia and the copper(II) ion is an ionic bond.
D) The ammonia molecule is a monodentate ligand.
E) The copper(II) ion is a 6-coordinate species in this complex ion.
Diff: 1
Section: 21.3
41) The correct name of the neutral coordination complex shown below is
A) cisdiaminodichloroplatinate(II).
B) cisdiaminodichloroplatinum(II).
C) cisdiamminedichloroplatinum(II).
D) transdiaminodichloroplatinum(II).
E) transdiamminedichloroplatinum(II).
Diff: 2
Section: 21.4
42) A platinum coordination complex has the formula, [PtCl(NH3)2Br], and exhibits a square planar geometry. How many geometric isomers of this compound should exist?
A) 1 (no isomers)
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.4
43) A platinum coordination complex has the formula, [Pt(Br)(Cl)(I)(NH3 )], and exhibits a square planar geometry. How many geometric isomers of this compound should exist?
A) 1 (no isomers)
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.4
44) A platinum coordination complex has the formula, [PtBr(CN)3]+, and exhibits a square planar geometry. How many geometric isomers of this compound should exist?
A) 1 (no isomers)
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.4
45) A coordination complex in which the ligands exhibit an octahedral geometry about the central metal ion has the formula, [CoCl2(NH3)4]. How many geometric isomers of this compound should exist?
A) 1 (no isomers)
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.4
46) A coordination complex in which the ligands exhibit an octahedral geometry about the central metal ion has the formula, [CoCl3(NH3)3]-. How many geometric isomers of this compound should exist?
A) 1 (no isomers)
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.4
47) Which complex ion is a chiral isomer?
A) square planar [Pt(en)2]2+
B) tetrahedral [NiCl4]2
C) octahedral [Co(en)3]3+
D) octahedral [Co(NH3)4Cl2]+
E) square planar [Pt(NH3)ClBrI]
Diff: 2
Section: 21.4
48) A coordination complex in which the ligands exhibit an octahedral geometry about the central metal ion has the formula, [CrCl2(en)2]+. How many geometric isomers of this compound should exist?
A) 1 (no isomers)
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.4
49) A coordination complex in which the ligands exhibit an octahedral geometry about the central metal ion has the formula, [CrCl2(en)2]+. How many isomers of this complex ion should exist?
A) 1 (no isomers)
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.4
50) The splitting of the d-orbitals of transition metals by a particular complex geometry gives rise to the pattern:
dxy dyz dxz
Energy ↑ 
Which one of the following geometries produces the splitting pattern seen above?
A) linear
B) octahedral
C) planar triangular
D) square planar
E) tetrahedral
Diff: 2
Section: 21.5
51) A complex ion which has its absorption maximum in the blue region of the visible spectrum would appear to be ________ in color.
A) blue-green
B) green-yellow
C) blue-violet
D) orange-yellow
E) red-violet
Diff: 2
Section: 21.5
52) A complex ion which has its absorption maximum in the red region of the visible spectrum would appear to be ________ in color.
A) green-blue
B) yellow-green
C) orange-yellow
D) blue-violet
E) red-violet
Diff: 2
Section: 21.5
53) Many coordination complexes are colored due to absorption of light in the visible region of the spectrum. Which one of the following coordination complexes of transition metals is not expected to be a colored complex?
Hint: Electrons transitioning between occupied and unoccupied d-orbitals produce colors in metal complexes.
A) Co(NH3)63+
B) Cr(NH3)62+
C) Cu(NH3)42+
D) V(H2O)63+
E) Zn(NH3)42+
Diff: 3
Section: 21.5
54) The following order is observed in the spectrochemical series for ligands
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
Based on this series, which of the following would absorb the highest energy light?
A) [Fe(NH3)6]2+
B) [Fe(NH3)6]3+
C) [Os(CN)6]4-
D) [Os(NH3)6]2+
E) [Fe(CN)6]3-
Diff: 2
Section: 21.5
55) The following order is observed in the spectrochemical series for ligands
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
Based on this series, which of the following would absorb the highest energy light?
A) [Os(NH3)6]2+
B) [Os(NH3)6]4+
C) [Os(H2O)6]4+
D) [Os(H2O)6]2+
E) [Os(Br)6]3-
Diff: 2
Section: 21.5
56) A Mo2+ ion has ________ 4d electrons.
A) 1
B) 2
C) 3
D) 4
E) 5
Diff: 1
Section: 21.5
57) The following order is observed in the spectrochemical series for ligands
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
It was observed that for the two 6-coordinate cobalt complexes, CoF63 and Co(NH3)63+, one is diamagnetic and one is paramagnetic. How many unpaired electrons are there in the paramagnetic complex ion?
A) 1
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.5
58) The following order is observed in the spectrochemical series for ligands
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
How many unpaired electrons would you expect to find in the complex ion, Cr(CN)63 if the value of the splitting parameter is as large as it is in typical cyanide complexes?
A) 1
B) 2
C) 3
D) 4
E) 5
Diff: 2
Section: 21.5
59) The following order is observed in the spectrochemical series for ligands
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
Cr(NH3)63+ and Ni(NH3)62+ are both positively charged coordination complexes. Which statement describes the magnetic properties of the complexes?
A) Cr(NH3)63+ and Ni(NH3)62+ are both diamagnetic.
B) Cr(NH3)63+ is diamagnetic while Ni(NH3)62+ is paramagnetic.
C) Cr(NH3)63+ is paramagnetic while Ni(NH3)62+ is diamagnetic.
D) Both complex ions are paramagnetic, but Cr(NH3)63+ has a larger number of unpaired electrons than Ni(NH3)62+ hence its paramagnetism is more pronounced.
E) Both complex ions are paramagnetic, but Ni(NH3)62+ has a larger number of unpaired electrons than Cr(NH3)63+ hence its paramagnetism is more pronounced.
Diff: 2
Section: 21.5
60) When bound to oxygen, the iron(II) found in a heme group has what coordination number?
A) 2
B) 4
C) 5
D) 6
E) 8
Diff: 1
Section: 21.6
61) The heme found in cyanocobalamin, otherwise known as vitamin B12, contains what metal ion?
A) Fe(II)
B) Fe(III)
C) Co(II)
D) Cr(III)
E) Cu(II)
Diff: 1
Section: 21.6
62) Heme groups contain a porphyrin structure as a part of their structure. The donor atoms in a porphyrin structure are composed of what element?
A) Oxygen
B) Nitrogen
C) Carbon
D) Iron
E) Sulfur
Diff: 1
Section: 21.6
63) The iron found in hemoglobin serves what purpose?
A) It holds together the structure.
B) It oxidizes bacteria found in the blood, killing them.
C) It converts oxygen into carbon dioxide.
D) It bonds to oxygen and allows the blood to carry oxygen throughout the body.
E) It allows hemoglobin to bond to DNA, helping to protect the DNA from damage.
Diff: 1
Section: 21.6
64) A bidentate ligand has ________ donor atom(s).
Diff: 1
Section: 21.1
65) A monodentate ligand has ________ donor atom(s).
Diff: 1
Section: 21.1
66) Ligands act as Lewis ________ when they react with a metal cation and form a bond.
Diff: 1
Section: 21.1
67) The equilibrium constant expression obtained for the process
Cu2+(aq) + 4NH3(aq) 
Cu(NH3)2+(aq)
is [Cu(NH3)42+]/[Cu2+][NH3]4. This expression is called the ________ constant.
Diff: 1
Section: 21.1
68) A compound contains a transition metal coordination complex. This coordination complex consists of one Ni(II) ion with 2 water molecules, two ethylenediamine (en) molecules, and the remaining positions filled with Cl ions acting as ligands. Write the correct formula for this complex ion with the correct charge.
Diff: 2
Section: 21.1
69) A compound contains a transition metal coordination complex. This coordination complex consists of one Cu(I) ion, complexed with two water molecules, one ethylenediamine molecule, and Cl ions in the remaining ligand positions. Write the correct formula for this complex ion, including the correct charge.
Diff: 2
Section: 21.1
70) Write the correct formula for the metal complex with the name potassium hexacyanoferrate(III).
Diff: 2
Section: 21.2
71) Write the correct formula for the metal complex with the name ammonium diaquatetrachlorocobaltate(II).
Diff: 2
Section: 21.2
72) Write the correct name for the metal complex Na[Co(NO2)6].
Diff: 2
Section: 21.2
73) Write the correct name for the metal complex [Pt(en)2Cl2](NO3)2.
Diff: 2
Section: 21.2
74) The correct formula for the dichlorobis(ethylenediamine) chromium(III) ion is ________.
Diff: 1
Section: 21.2
75) The ethylenediamine molecule (en), functions as a bidentate ligand and forms a coordination complex with platinum: [Pt(en)2]2+. What is the coordination number to the platinum(II) ion in this coordination complex?
Diff: 1
Section: 21.3
76) The ethylenediamine molecule (en), functions as a bidentate ligand and forms a coordination complex with cobalt: [Co(en)2(H2O)2]3+. Assign a coordination number and a charge to the cobalt ion in this coordination complex.
Diff: 1
Section: 21.3
77) Give the names of both isomers of Pt(NH3)2Br2.
Diff: 1
Section: 21.3
78) In the coordination complex [Ag(NH3)2]Br, the coordination number and oxidation number of the central atom are ________.
Diff: 1
Section: 21.3
79) In the coordination complex [Pt(NH3)2Cl2], the coordination number and oxidation number of the central atom are ________.
Diff: 1
Section: 21.3
80) In the coordination complex [Co(NH3)2(H2O)2Cl2]+, the coordination number and oxidation number of the central atom are ________.
Diff: 1
Section: 21.3
81) In the coordination complex [Cr(NH3)2(en)Cl2]Br2, the coordination number and oxidation number of the central atom are ________.
Diff: 1
Section: 21.3
82) Which complex—Cr(CN)6 or Cr(H2O)63+—would have the greatest crystal field splitting, and why?
Diff: 1
Section: 21.5
83) Explain the splitting of the d orbitals in an octahedral crystal field.
Diff: 2
Section: 21.5
84) Which complex—[Cr(H2O)6]2+ or [Cr(H2O)6]3+—has the greatest crystal field splitting, and why?
Diff: 2
Section: 21.5
85) [Fe(H2O)6]2+ is a paramagnetic complex, while [Fe(CN)6]2- is a diamagnetic complex. Explain why the iron forms the two different types of complexes, in terms of crystal field theory.
Diff: 2
Section: 21.5
86) Sketch the 5 d orbitals, and label them.
Diff: 2
Section: 21.5
87) The ion [Co(NH3)6]2+ is octahedral and high spin. What type of magnetism does this complex exhibit?
Hint: Consider the number of electrons that occupy the split d-orbital system.
Diff: 3
Section: 21.5
88) Which complex ion should exhibit the larger value of the crystal field splitting, Co(NH3)62+ or Co(NH3)63+?
Diff: 2
Section: 21.5
89) A V3+ ion has ________ 3d electrons.
Diff: 1
Section: 21.5
90) A porphyrin structure that contains Fe2+ and functions in the transport and storage of oxygen in the blood is called ________.
Diff: 1
Section: 21.6
91) Which complex ion should exhibit the larger value of the crystal field splitting, Co(NH3)63+ or Rh(NH3)63+?
Diff: 2
Section: 21.5
92) The following order is observed in the spectrochemical series for the ligands:
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
It was observed that for the two 6-coordinate cobalt complexes, CoF63 and Co(NH3)63+, one is diamagnetic and one is paramagnetic. Which one is the diamagnetic complex?
Diff: 2
Section: 21.5
93) The following order is observed in the spectrochemical series for the ligands:
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
It was observed that for the two 6-coordinate cobalt complexes, Co(NH3)63+ and Co(H2O)62+, one is diamagnetic and one is paramagnetic. Which one is the paramagnetic complex?
Diff: 2
Section: 21.5
94) A Mn2+ ion has ________ 3d electrons.
Diff: 2
Section: 21.5
95) A Fe2+ ion has ________ 3d electrons.
Diff: 2
Section: 21.5
96) In transition metal complexes, the metal ions are Lewis acids.
Diff: 1
Section: 21.1
97) Coordination complexes of a particular metal ion, in which water is the ligand, usually contain fewer ligands than coordination complexes of the same metal with ethylenediamine as the ligand.
Diff: 2
Section: 21.1
98) A polydentate ligand has more than one acceptor atom that can attach to the metal ion to form a coordination complex.
Diff: 1
Section: 21.1
99) All ligands with two donor atoms are bidentate ligands.
Diff: 1
Section: 21.1
100) A polydentate ligand has more than one donor atom that can attach to the metal ion to form a coordination complex.
Diff: 1
Section: 21.1
101) Ethylenediaminetetraacetate, abbreviated EDTA4, is a ligand whose ability to form coordination complexes has a wide range of useful applications, including good preservation.
Diff: 1
Section: 21.1
102) Monodentate ligands form chelate complexes more readily than polydentate ligands, due to the chelate effect.
Diff: 1
Section: 21.1
103) The chelating effect results in stronger bonds between the ligand and the metal.
Diff: 1
Section: 21.1
104) Another name for ferrocyanide, a transition metal complex ion in which the iron is in the +2 oxidation state, is hexacyanoferrite.
Diff: 1
Section: 21.2
105) Geometric isomers are two structural forms of metal complexes with identical chemical properties.
Diff: 1
Section: 21.2
106) Octahedral metal complexes can have geometric isomers.
Diff: 1
Section: 21.4
107) A coordination complex has the empirical formula, Cr(NH3)5Cl3, and has a limited solubility in water. The reaction of a solution of this complex with silver nitrate solution consistently produces two millimoles of silver chloride for every millimole of the Cr(NH3)5Cl3. Reaction with aqueous H2SO4 or HCl results in no free ammonia in the solution. Which complex ion is consistent with these observations?
Hint: Compare the stoichiometries of the reactant and product complexes.
A) [Co(NH3)5Cl]Cl2
B) [Co(NH3)5Cl2]Cl
C) [Co(NH3)5Cl3]
D) [CoCl3]∙5NH3
E) [Co(NH3)3Cl3]∙2NH3
Diff: 3
Section: 21.1
108) Even though there are two isomers of the square planar complex [Pt(NH3)2Cl2], there are no isomers for a related complex, [Pt(en)Cl2]. Suggest a reason why.
Hint: Consider the behavior of monodentate vs bidentate ligands.
Diff: 3
Section: 21.4
109) A solution was prepared by dissolving 1.378 g of a compound with the formula, Co(NH3)4Cl3, in a small quantity of water. When this solution was treated with aqueous silver nitrate, a white precipitate was obtained. The treatment was continued until precipitation ceased, and the precipitate was carefully collected, washed, dried, and weighed. The yield was 0.8642 g. If the coordination sphere of the metal ion remained intact throughout this procedure, which of the choices below could describe the coordination sphere of the metal ion?
Hint: Consider the identity of the precipitate.
Coordination # geometry # of possible isomers
A) 4 tetrahedral 1 (no isomers)
B) 4 square planar 1 (no isomers)
C) 5 trigonal bipyramid 3
D) 6 octahedral 1 (no isomers)
E) 6 octahedral 2
Diff: 3
Section: 21.4
110) The following order is observed in the spectrochemical series for the ligands:
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
Cr(CN)63- and Co(CN)63- are both negatively charged coordination complexes. Which statement describes the magnetic properties of the complexes?
A) Cr(CN)63- and Co(CN)63- are both diamagnetic.
B) Cr(CN)63- is diamagnetic while Co(CN)63- is paramagnetic.
C) Cr(CN)63- is paramagnetic while Co(CN)63- is diamagnetic.
D) Both complex ions are paramagnetic, but Cr(CN)63- has a larger number of unpaired electrons than Co(CN)63- hence its paramagnetism is more pronounced.
E) Both complex ions are paramagnetic, but Co(CN)63- has a larger number of unpaired electrons than (CN)63- hence its paramagnetism is less pronounced.
Diff: 2
Section: 21.5
111) The carbon monoxide ligand, CO, is a very good crystal field splitter, but O2 is not. Using this information and Figure 21.25 in your book, explain why the bonding of CO to heme in place of O2 is so dangerous to mammals.
Hint: Greater splitting results in a stronger metal-ligand bond.
Diff: 3
Section: 21.5
112) 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+
Diff: 2
Section: 21.5
113) The following order is observed in the spectrochemical series for the ligands:
CN- > NO2- > en > NH3 > H2O > C2O42- > OH- > F- > Cl- > Br- > I-
FeF63 and Fe(CN)63 are both negatively charged coordination complexes. Which statement describes the magnetic properties of the complexes?
A) FeF63 and Fe(CN)63 are both diamagnetic.
B) FeF63 is diamagnetic while Fe(CN)63 is paramagnetic.
C) FeF63 is paramagnetic while Fe(CN)63 is diamagnetic.
D) Both complex ions are paramagnetic, but FeF63 has a larger number of unpaired electrons than Fe(CN)63 hence its paramagnetism is more pronounced.
E) Both complex ions are paramagnetic, but Fe(CN)63 has a larger number of unpaired electrons than FeF63 hence its paramagnetism is more pronounced.
Diff: 2
Section: 21.5
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