Chapter 22 – The Transition Elements and Coordination Compounds
1. Which of the following is not a transition-metal?
A)
cobalt
B)
ruthenium
C)
rhodium
D)
vanadium
E)
aluminum
2. Which of the following is not a characteristic of the transition metals?
A)
variable oxidation state
B)
the ability to form many colored compounds
C)
valence electrons in a d subshell
D)
high electronegativity
E)
the ability to form complex ions
3. Which of the following is not a characteristic property of transition-element compounds?
A)
Most of them are colored.
B)
Most of them are paramagnetic.
C)
Most of the metals exhibit multiple oxidation states.
D)
Most of the elements form many complexes.
E)
Most of the elements, upon ionizing, lose the d electrons first.
4. Transition metals can be distinguished from main-group metals by the fact that
A)
main-group metals have only +1 or +2 oxidation states.
B)
transition metals have higher relative atomic masses than main-group metals.
C)
transition metals have a greater tendency to form colored compounds than main-
group metals.
D)
main-group metals have higher relative atomic masses than transition metals.
E)
only the main-group metals can form complex ions.
5. An element with the electron configuration [Xe]6s24f145d7 would belong to which class on
the periodic table?
A)
rare-earth elements
B)
transition elements
C)
alkaline-earth elements
D)
halogens
E)
none of the above
6. Ti has __________ in its d orbitals.
A)
1 electron
B)
2 electrons
C)
3 electrons
D)
4 electrons
E)
none of these
7. Fe has __________ that is(are) unpaired in its d orbitals.
A)
3 electrons
B)
4 electrons
C)
1 electron
D)
2 electrons
E)
5 electrons
8. 1s22s22p63s23p64s23d2 is the correct electron configuration for which of the following
atoms?
A)
Ti
B)
Ca
C)
Ge
D)
Zr
E)
none of these
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9. The phenomenon called __________ contraction is responsible for the great similarity in
atomic size and chemistry of 4d and 5d elements.
A)
coordination
B)
isomeric
C)
lanthanide
D)
transition
E)
none of these
10. Which of the following statements is incorrect concerning the 3d, 4d, and 5d transition
series?
A)
There is a large increase in radius in going from the 3d to the 4d metals.
B)
There is a general increase in size going left to right across each series due to an
increasing number of electrons.
C)
Hafnium through mercury exhibit what is referred to as the lanthanide contraction.
D)
The separation of hafnium and zirconium found together in nature is difficult due
to their similar chemistries, which are attributed to their virtually identical sizes.
E)
The transition metal from a period 6 group is similar in size to the peroid 5
transition metal sitting above it on the periodic table.
11. What is the maximum oxidation state expected for chromium?
A)
+6
B)
+3
C)
+4
D)
+7
E)
+5
12. Which of the following first-row transition elements is not able to have a +3 oxidation state?
A)
Sc
B)
Cr
C)
V
D)
Zn
E)
Fe
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13. What is the maximum oxidation state for rhenium, Re?
A)
6
B)
3
C)
2
D)
7
E)
4
14. What is the maximum oxidation state for niobium, Nb?
A)
4
B)
3
C)
2
D)
6
E)
5
15. What is the maximum oxidation number for chromium?
A)
7
B)
4
C)
6
D)
5
E)
8
16. In which of the following compounds is the metal atom not in a common oxidation state?
A)
CrOCl2
B)
NiF2
C)
CuI
D)
Zn(NO3)2
E)
MnSO4
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17. A property that many representative nonmetals and many transition elements share is that
they both have
A)
color in many compounds.
B)
many paramagnetic compounds.
C)
high electronegativities.
D)
many compounds that observe the octet rule.
E)
many oxidation states.
18. All of the following elements have the oxidation states listed except
A)
Ti, +3.
B)
Zn, +3.
C)
V, +3.
D)
Co, +3.
E)
Fe, +3.
19. In which compound is cobalt in the highest oxidation state?
A)
Co2(CO)8
B)
[Co(NH3)6]Cl2
C)
[Co(NH3)4Cl2]Cl
D)
Na2[CoCl4]
E)
K4[CoF6]
20. The oxidation number of which of the following elements is often +2 but can be as great
as +7?
A)
manganese
B)
cobalt
C)
aluminum
D)
bismuth
E)
chromium
21. Which of the following statements about transition metals is/are correct?
1.
The sixth period elements have higher ionization energies than the fourth and
fifth period element in their respective groups.
2.
The total number of oxidation states observed for a fourth period element is
greatest for manganese (group VIIB).
3.
Covalent radii uniformly decrease from left to right across each period.
A)
1 only
B)
2 only
C)
3 only
D)
1 and 2
E)
1, 2, and 3
22. Which of the following is a dark green solid?
A)
CrO3
B)
KCr(SO4)2·12H2O
C)
Na2Cr2O7
D)
Na2CrO4
E)
Cr2O3
23. What is the principal ore of chromium?
A)
chromite
B)
chromate
C)
chrome alum
D)
stibnite
E)
hematite
24. Which of the following is a product of the acidification of sodium chromate?
A)
CrO42-(aq)
B)
Cr2O72-(aq)
C)
Cr3+(aq)
D)
CrO3(s)
E)
Cr(s)
25. Copper metal can be oxidized by which of the following acids?
A)
H3PO4
B)
HI
C)
H2SO4
D)
CH3COOH
E)
HBr
26. Common ores of copper may contain which of the following forms of copper?
1.
The free metal or native copper (Cu(s))
2.
Cu2O(s) and CuO(s)
3.
CuS(s)
A)
1 only
B)
2 only
C)
3 only
D)
1 and 2
E)
1, 2, and 3
27. In which of these pairs of elements can both elements normally exhibit multiple oxidation
states?
A)
K and O
B)
Cs and Cl
C)
Mg and Se
D)
Co and Cu
E)
Sc and Al
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28. Which of the following coordination compounds will immediately form a precipitate when
combined with an AgNO3 solution?
A)
K[Cr(NH3)2Cl4]
B)
K3[Cr(CN)6]
C)
[Cr(NH3)6]Cl3
D)
[Cr(NH3)2(H2O)Cl3]
E)
[Cr(NH3)3Cl3]
29. The formula for a platinum(IV) complex is [Pt(NH3)2Br2]Cl2. In aqueous solution, it will
dissociate into
A)
5 ions.
B)
4 ions.
C)
6 ions.
D)
2 ions.
E)
3 ions.
30. What is the oxidation state of iron in K4[Fe(CN)6]?
A)
3
B)
2
C)
4
D)
−4
E)
31. Which of the following is a necessary characteristic of a ligand?
A)
A ligand must be an anion.
B)
A ligand must be an ion.
C)
A ligand must be a Lewis base.
D)
A ligand must be bidentate.
E)
A ligand must be a Lewis acid.
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32. The bond between a metal cation and a ligand is best classified as a(n)
A)
polar covalent bond.
B)
ionic bond.
C)
nonpolar covalent bond.
D)
polydentate bond.
E)
coordinate covalent bond.
33. In which of the following ions does the metal ion have a 3d7 electron configuration?
A)
[NiCl4]2–
B)
[Mn(H2O)6]2+
C)
[CoCl4]2–
D)
[Co(NH3)5Cl]2+
E)
[Co(NH3)4Cl2]+
34. What is the coordination number of iron in K3[Fe(ox)3]?
ox =
A)
6
B)
3
C)
4
D)
5
E)
2
35. What is the coordination number of cobalt in [Co(en)2Cl2]Cl?
en =
A)
6
B)
3
C)
4
D)
5
E)
7
36. In complexes of platinum(IV), the coordination number is usually
A)
3.
B)
4.
C)
6.
D)
2.
E)
1.
37. The freezing point of an aqueous 0.050 m solution of a platinum(IV) complex having the
molecular formula Pt(NH3)3Cl4 is –0.19°C. Which of the following equations best represents
what happens when Pt(NH3)3Cl4 dissociates in water? (Kf for water is 1.86°C/m.)
A)
Pt(NH3)3Cl4(s) → [Pt(NH3)3Cl2]2+(aq) + 2Cl–(aq)
B)
Pt(NH3)3Cl4(s) → [Pt(NH3)3Cl3]+(aq) + Cl–(aq)
C)
Pt(NH3)3Cl4(s) → [Pt(NH3)3Cl]3+(aq) + 3Cl–(aq)
D)
Pt(NH3)3Cl4(s) → [Pt(NH3)2Cl2]2+(aq) + 2Cl–(aq) + NH3(aq)
E)
Pt(NH3)3Cl4(s) → Pt4+(aq) + 4Cl–(aq) + 3NH3(aq)
38. Which of the following species is least likely to function as a ligand in a transition-metal
coordination compound?
A)
NH3
B)
CO32–
C)
H2O
D)
BF3
E)
Cl–
39. Ag+ forms many complexes with a coordination number of 2. Some of these are
[Ag(NH3)2]+, [Ag(CN)2]–, and [Ag(S2O3)2]3–. Which of the following statements is true?
A)
The hybridization of Ag+ is sp2.
B)
In these complexes, Ag+ is a Lewis base.
C)
In these complexes, the ligands are monodentate.
D)
The hybridization of Ag+ is dsp.
E)
The Ag+ complexes are good reducing agents.
40. Which of the following liquids could best act as a bidentate ligand for a metal ion?
A)
NH2Cl
B)
NH3
C)
ClCH2CH2NH2
D)
N2H5+
E)
H2NCH2CH2NH2
41. Which of the following Lewis bases may not serve as a bidentate ligand?
A)
C2O42–
B)
NH2CH2CH2NH2
C)
HOCH2CH2NH2
D)
HOCH2CH2OH
E)
CH3NH2