95) Which one of the following complexes is considered to be tetrahedral?
A) [FeCl4]–
B) [Ni(CN)4]2-
C) [PtCl4]2-
D) [PdCl2(NH3)2]
96) How many unpaired electrons will Co have in the complex [CoCl4]2-?
A) 1
B) 3
C) 4
D) 5
97) Which group of elements, indicated by letter and shading on the periodic table above, represents the
transition elements?
A) A
B) B
C) C
D) D
98) Which group of elements, indicated by letter and shading on the periodic table above, represents the
inner transition elements?
A) A
B) B
C) C
D) D
99) Which element indicated on the above periodic table has the electron configuration [Kr] 4d5 5s2?
A) element A
B) element B
C) element C
D) element D
100) Which element indicated on the above periodic table has the electron configuration [Xe] 4f7 5d1
6s2?
A) element A
B) element B
C) element C
D) element D
101) Which element indicated on the above periodic table has the electron configuration [Ar] 3d3 4s2?
A) element A
B) element B
C) element C
D) element D
102) Which element indicated on the above periodic table has the electron configuration [Ar] 3d10 4s1?
A) element A
B) element B
C) element C
D) element D
103) Which is the most common ion formed by element B on the above periodic table?
A) B+
B) B2+
C) B3+
D) B4+
104) Which is the most common ion formed by element D on the above periodic table?
A) B+
B) B2+
C) B3+
D) B7+
The first transition series metals are shown below.
105) Which has the highest melting point?
A) Sc
B) V
C) Mn
D) Zn
106) Which has the lowest melting point?
A) Sc
B) V
C) Mn
D) Zn
107) Which has the largest atomic radius?
A) Sc
B) V
C) Ni
D) Zn
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108) Which has the smallest atomic radius?
A) Sc
B) V
C) Ni
D) Zn
109) Which has the greatest density?
A) Sc
B) V
C) Cu
D) Zn
110) Which has the most positive standard oxidation potential?
A) Sc
B) V
C) Cu
D) Zn
111) Which has the most negative standard oxidation potential?
A) Sc
B) V
C) Cu
D) Zn
112) Based on the variation in Zeff, which M2+ ion should be the strongest reducing agent?
A) Ti
B) Cr
C) Fe
D) Zn
113) Based on the variation in Zeff, which M2+ ion should be the weakest reducing agent?
A) Ti
B) Cr
C) Fe
D) Zn
114) Based on the variation in Zeff, which oxoanion should be the strongest oxidizing agent?
A) VO43-
B) CrO42-
C) MnO42-
D) FeO42-
115) Based on the variation in Zeff, which oxoanion should be the weakest oxidizing agent?
A) VO43-
B) CrO42-
C) MnO42-
D) FeO42-
116) Which metal exhibits the highest oxidation state in its compounds?
A) Sc
B) Cr
C) Mn
D) Zn
The second transition series metals are shown below.
117) Which has the highest melting point?
A) Y
B) Mo
C) Tc
D) Cd
118) Which has the lowest melting point?
A) Y
B) Mo
C) Tc
D) Cd
119) Which has the largest atomic radius?
A) Y
B) Mo
C) Rh
D) Cd
120) Which has the smallest atomic radius?
A) Y
B) Mo
C) Rh
D) Cd
121) Which has the greatest density?
A) Y
B) Mo
C) Rh
D) Cd
122) Which has the lowest density?
A) Y
B) Mo
C) Rh
D) Cd
The third transition series metals are shown below.
123) Which has the highest melting point?
A) La
B) W
C) Os
D) Hg
124) Which has the lowest melting point?
A) La
B) W
C) Os
D) Hg
125) Which has the largest atomic radius?
A) La
B) W
C) Os
D) Hg
126) Which has the smallest atomic radius?
A) La
B) W
C) Os
D) Hg
127) Which has the greatest density?
A) La
B) W
C) Os
D) Hg
128) Which has the lowest density?
A) La
B) W
C) Os
D) Hg
129) Which of the above are bidentate ligands?
A) All are bidentate.
B) (a) and (b)
C) (c) and (d)
D) None are bidentate.
130) Which of the above are monodentate ligands?
A) All are monodentate.
B) (a) and (b)
C) (c) and (d)
D) None are monodentate.
131) Which of the above are ligands that contain two or more donor atoms?
A) All contain two or more donor atoms.
B) (a) and (b)
C) (c) and (d)
D) None contain two or more donor atoms.
132) Which of the above are bidentate or tridentate ligands, capable of forming chelate rings?
A) (a) and (c)
B) (b) and (d)
C) (a), (b), and (c)
D) (a), (b), (c), and (d)
133) Which of the above are monodentate ligands?
A) (a) and (c)
B) (b) and (d)
C) All are monodentate.
D) None are monodentate.
Consider the following isomers of [Co(NH3)4Br2]+. The black sphere represents Co, gray spheres
represent NH3, and unshaded spheres represent Br.
134) Which are cis-isomers?
A) isomers (1) and (2)
B) isomers (1) and (3)
C) isomers (2) and (4)
D) isomers (3) and (4)
135) Which are trans-isomers?
A) isomers (1) and (2)
B) isomers (1) and (3)
C) isomers (2) and (4)
D) isomers (3) and (4)
136) Which structures are identical?
A) None of the structures are identical.
B) structure (1) = structure (2) and structure (3) = structure (4)
C) structure (1) = structure (3) and structure (2) = structure (4)
D) structure (1) = structure (4) and structure (2) = structure (3)
137) Which exist as enantiomers?
A) All exist as enantiomers.
B) isomers (1) and (3)
C) isomers (2) and (4)
D) None exist as enantiomers.
Consider the following ethylenediamine complexes. The black sphere represents Co, gray connected
spheres represent ethylenediamine, NH2CH2CH2NH2, and unshaded spheres represent Br.
138) Which complexes are chiral?
A) complexes (1), (2), and (3)
B) complexes (1), (2), and (4)
C) complexes (1), (3), and (4)
D) complexes (2), (3), and (4)
139) Which complexes are enantiomers of one another?
A) complexes (1) and (3)
B) complexes (1) and (4)
C) complexes (3) and (4)
D) complexes (1), (3), and (4)
140) Which of the Co(III) complexes above are enantiomers of each other?
A) (A) and (B)
B) (C) and (D)
C) (A), (B), and (C)
D) (A), (B), (C), and (D)
141) Which of the Co(III) complexes above are optically active?
A) (A) and (B)
B) (C) and (D)
C) (A), (B), and (C)
D) (A), (B), (C), and (D)
142) Which Pt(II) complexes are geometric isomers of each other?
A) (a) and (f)
B) (b) and (e)
C) (c) and (d)
D) (a) and (b)
143) Using the above schematic of an artist’s color wheel, determine the color seen if a substance
absorbs red and yellow light.
A) blue
B) green
C) orange
D) violet
144) Using the above schematic of an artist’s color wheel, determine the color seen if a substance
absorbs yellow and blue light.
A) green
B) orange
C) red
D) violet
145) Using the above schematic of an artist’s color wheel, determine the color absorbed if a substance is
seen as being green in color.
A) blue
B) orange
C) red
D) violet
146) The absorbance spectrum of a complex along with an artist’s color wheel is shown below.
Determine the color one might see for this complex.
A) green
B) red
C) red-violet
D) yellow
147) Which is the crystal field energy level diagram for an octahedral ML6 complex?
A) (A)
B) (B)
C) (C)
D) (D)
148) Which is the crystal field energy level diagram for a square pyramidal ML5 complex that contains
a single ligand on the z-axis?
A) (A)
B) (B)
C) (C)
D) (D)
149) Which is the crystal field energy level diagram for a square planar ML4 complex that contains no
ligands on the z-axis?
A) (A)
B) (B)
C) (C)
D) (D)
150) Which is the crystal field energy level diagram for a tetrahedral ML4?
A) (A)
B) (B)
C) (C)
D) (D)
20.2 Algorithmic Questions
1) Which of the following elements is an inner transition metal?
A) Eu
B) Fe
C) Ru
D) Sc
2) What is the ground-state electron configuration for the element chromium (Z = 24)?
A) [Ne] 4s2 3d4
B) [Ar] 4s2 3d4
C) [Ar] 4s1 3d5
D) [Ar] 3d6
3) What is the ground-state electron configuration for Cr3+ (Z = 2 4)?
A) [Ar] 4s2 3d7
B) [Ar] 4s2 3d1
C) [Ar] 3d3
D) [Ar] 4s1 3d2
4) How many d electrons are there in W O42-?
A) 0
B) 1
C) 2
D) 3
5) Which of the following species has the electron configuration [Ar]3d6?
A) Cr
B) Fe3+
C) Co3+
D) Ni3+
6) What is the highest possible oxidation state for manganese?
A) + 2
B) + 5
C) + 6
D) + 7
7) Which of the following can function as a bidentate ligand?
A) CO
B) OH –
C) N H3
D) C2O4 2-
8) Which of the following can function as a chelating agent?
A) SH–
B) H2O
C) H2NCH2CO2–
D) SCN –
9) Which of the following species is diamagnetic?
A) an isolated, gas-phase Cr3+ ion
B) a high-spin octahedral Cr2+ complex
C) an isolated, gas-phase Cu2+ ion
D) a low-spin octahedral Co3+ complex
10) Which ion would you expect to have the largest crystal field splitting Δ?
A) [ Rh(CN)6]4-
B) [ Rh(CN)6]3-
C) [ Rh(H2O)6]2+
D) [ Rh(H2O)6]3+
20.3 Short Answer Questions
1) Transition elements are located in the ________-block of the periodic table.
2) Inner transition elements are found in the ________-block of the periodic table.
3) Using shorthand notation, the electron configuration of Co3+ is ________.
4) Copper has the anomalous short-hand electron configuration ________.
5) Mn2+ has ________ d electrons.
6) Fe3+ has ________ valence electrons.
7) The element that forms a 2+ ion with the electron configuration [Xe] 4f14 5d8 is ________.
8) The short hand electron configuration of iron in [FeF6]3- is ________.
9) The small sizes of third transition series atoms is referred to as the ________ contraction.
10) The first transition series element expected to have the lowest second ionization energy is ________.
11) The oxidation state of chromium in Cr2O72- is ________.
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12) The highest oxidation state attainable by Mn is ________.
13) The coordination number of platinum in Pt(NH3)2Cl2 is ________.
14) The coordination number of cobalt in [Co(NH3)4Cl2]Cl is ________.
15) The coordination number of chromium in [Cr(EDTA)]– is ________.
16) The oxidation state of palladium in K2[PdCl4] is ________.
17) Polydentate ligands are known as ________ agents.
18) The formula for tetraamminedichlorochromium(III) chloride is ________.
19) The number of diastereoisomers possible for [Co(en)2Cl2]+ is ________.
20) [Co(NH3)5NCS]2+ and [Co(NH3)5SCN]2+ are examples of ________ isomers.
21) The color exhibited by coordination compounds is usually due to the absorption of light by a d–
electron, resulting in the promotion of the d-electron from its ground-state d-orbital to a higher energy
orbital. The first transition series element expected to have a colorless aqueous solution M2+ ion is
________.
22) Platinum uses ________ hybrid orbitals to accept electron pairs from ligands in cis-Pt(NH3)2Cl2.
23) The number of unpaired electrons in Co(NH3)63+ is ________.
24) The number of unpaired electrons in square planar PtCl42- is ________.
25) The number of unpaired electrons in tetrahedral NiBr42- is ________.