131) 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)
132) Which of the above are monodentate ligands?
A) (a) and (c)
B) (b) and (d)
C) All are monodentate.
D) None are monodentate.
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Consider the following isomers of [Co(NH3)4Br2]+. The black sphere represents Co, gray
spheres represent NH3, and unshaded spheres represent Br.
133) Which are cis-isomers?
A) isomers (1) and (2)
B) isomers (1) and (3)
C) isomers (2) and (4)
D) isomers (3) and (4)
134) Which are trans-isomers?
A) isomers (1) and (2)
B) isomers (1) and (3)
C) isomers (2) and (4)
D) isomers (3) and (4)
135) 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)
136) 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
137) 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)
138) 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)
139) 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)
140) 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)
141) 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)
142) 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
143) 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
144) 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
145) 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
146) Which is the crystal field energy level diagram for an octahedral ML6 complex?
A) (A)
B) (B)
C) (C)
D) (D)
147) 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)
148) 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) 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
2) Which of the following elements is an inner transition metal?
A) Eu
B) Fe
C) Ru
D) Sc
3) What is the ground-state electron configuration for Cr3+ (Z = 24)?
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, △?
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) Using shorthand notation, the electron configuration of Co3+ is ________.
3) The small sizes of third transition series atoms is referred to as the ________ contraction.
4) The oxidation state of chromium in Cr2O72– is ________.
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5) The coordination number of platinum in Pt(NH3)2Cl2 is ________.
6) Polydentate ligands are known as ________ agents.
7) The formula for tetraamminedichlorochromium(III) chloride is ________.
8) The number of diastereoisomers possible for [Co(en)2Cl2]+ is ________.
9) Platinum uses ________ hybrid orbitals to accept electron pairs from ligands in cis–
Pt(NH3)2Cl2.
10) The number of unpaired electrons in Co(NH3)63+ is ________.