Question 1

Which of the following is a bidentate ligand?

Accepted Answer

A)  H2O 
B)  NO2- 
C)  NH3 
D)  H2NCH2CH2NH2 
E)  [(O2
C) 2NCH2CH2N(CO2)2]4- 
A)  H2O 
B)  NO2- 
C)  NH3 
D)  H2NCH2CH2NH2 
E)  [(O2
C) 2NCH2CH2N(CO2)2]4- D

Question 2

Give the correct name for [AuF4]-.

Accepted Answer

A)  gold fluoride 
B)  tetrafluoroaurate(III) 
C)  gold tetrafluoride 
D)  tetrafluorogold(III) 
E)  tetrafluoride gold 
A)  gold fluoride 
B)  tetrafluoroaurate(III) 
C)  gold tetrafluoride 
D)  tetrafluorogold(III) 
E)  tetrafluoride gold B

Question 3

As ethylenediamine is added to a solution of [Ni(H2O)6]2+, the water molecules are replaced two at a time by ethylenediamine to produce the sequence of ions: [Ni(H2O)6]2+, [Ni(en)(H2O)4]2+, [Ni(en)2(H2O)2]2+, and [Ni(en)3]2+. How does the color change through the sequence?

Accepted Answer

A)  The color changes toward red with the addition of ethylenediamine. 
B)  The color changes toward purple with the addition of ethylenediamine. 
C)  Red, yellow, purple, blue with the addition of ethylenediamine. 
D)  There is no color change with the addition of ethylenediamine. 
E)  The color change cannot be predicted with the addition of ethylenediamine. 
A)  The color changes toward red with the addition of ethylenediamine. 
B)  The color changes toward purple with the addition of ethylenediamine. 
C)  Red, yellow, purple, blue with the addition of ethylenediamine. 
D)  There is no color change with the addition of ethylenediamine. 
E)  The color change cannot be predicted with the addition of ethylenediamine. A

Question 4

What is the concentration of Ni2+ if 0.223 g of NiCl2 is dissolved in 250.0 mL of 0.760 M NH3? Kf ([Ni(NH3)6]2+) = 5.5 × 108

Accepted Answer

A)  6.9 × 10-3 M 
B)  7.6 × 10-11 M 
C)  1.3 × 10-11 M 
D)  9.7 × 10-11 M 
E)  1.4 × 10-11 M 
A)  6.9 × 10-3 M 
B)  7.6 × 10-11 M 
C)  1.3 × 10-11 M 
D)  9.7 × 10-11 M 
E)  1.4 × 10-11 M

Question 5

It is known that the sulfhydryl group, -SH, forms strong coordinate bonds to certain heavy metal ions. Which of the following do you expect to be the best chelating agent for heavy metal ions?

Accepted Answer

A)  HS-CH2-CH(SH)-CH2-OH 
B)  H-SH 
C)  CH3-SH 
D)  CH3-S-S-CH3 
E)  SO42- 
A)  HS-CH2-CH(SH)-CH2-OH 
B)  H-SH 
C)  CH3-SH 
D)  CH3-S-S-CH3 
E)  SO42-

Question 6

What is the concentration of Zn2+ if 0.254 g of ZnCl2 is dissolved in 200.0 mL of 2.00 M NH3? Kf ([Zn(NH3)4]2+) = 4.1 × 108

Accepted Answer

A)  0.0093 M 
B)  1.5 × 10-12 M 
C)  2.4 × 10-9 M 
D)  2.3 × 10-12 M 
E)  0.0019 M 
A)  0.0093 M 
B)  1.5 × 10-12 M 
C)  2.4 × 10-9 M 
D)  2.3 × 10-12 M 
E)  0.0019 M

Question 7

In the cation [CoCl2(en)2]+, the oxidation state of cobalt and its coordination number, respectively, are ________.

Accepted Answer

A)  -3 and two 
B)  +2 and six 
C)  +4 and four 
D)  +3 and six 
E)  -4 and six 
A)  -3 and two 
B)  +2 and six 
C)  +4 and four 
D)  +3 and six 
E)  -4 and six

Question 8

Give the correct name for [Al(H2O)4]3+.

Accepted Answer

A)  hydrated aluminum 
B)  aluminum hydrate 
C)  tetraaquoaluminate(6) 
D)  tetraaquaaluminum(III) 
E)  tetrawateraluminum(4) 
A)  hydrated aluminum 
B)  aluminum hydrate 
C)  tetraaquoaluminate(6) 
D)  tetraaquaaluminum(III) 
E)  tetrawateraluminum(4)

Question 9

The net formation constant for tetrachloromercurate(II) ion is 1.2 × 1015. Calculate the approximate standard electrode potential for: 
[HgCl4]2-(aq) + 2 e- → Hg(l) + 4 Cl-(aq)
Given: Hg2+(aq) + 2 e- → Hg(l) E° + 0.85 V

Accepted Answer

A)  -0.39 V 
B)  -0.63 V 
C)  +0.70 V 
D)  +0.41 V 
E)  zero 
A)  -0.39 V 
B)  -0.63 V 
C)  +0.70 V 
D)  +0.41 V 
E)  zero

Question 10

Conductivity experiments indicate that dichlorotetraamine-palladium (IV) chloride is composed of 3 moles of ions per mole of compound. However, only 2 moles of AgCl per mole of compound are precipitated rapidly when silver nitrate solution is added to a solution of the palladium compound.
What is the probable structure of the complex ion?

Accepted Answer

A)  octahedral 
B)  square planar 
C)  tetrahedral 
D)  linear 
E)  trigonal planar 
A)  octahedral 
B)  square planar 
C)  tetrahedral 
D)  linear 
E)  trigonal planar

Question 11

Which of the following metal ions has coordination numbers of 2 or 4?

Accepted Answer

A)  Fe3+ 
B)  Co3+ 
C)  Cu+ 
D)  Pt2+ 
E)  Cr3+ 
A)  Fe3+ 
B)  Co3+ 
C)  Cu+ 
D)  Pt2+ 
E)  Cr3+

Question 12

A compound has the empirical formula CoCl3 ∙ 5NH3. One mole of it yields two moles of silver chloride when treated with silver nitrate. Ammonia is not removed by treatment with concentrated sulfuric acid. A reasonable formula for the compound is ________.

Accepted Answer

A)  [Co(NH3)5]Cl3 
B)  CoCl3 ∙ 5NH3 
C)  [Co(NH3)4Cl]Cl2 ∙ NH3 
D)  [Co(NH3)5Cl]Cl2 
E)  [Co(NH3)4Cl2]Cl ∙ NH3 
A)  [Co(NH3)5]Cl3 
B)  CoCl3 ∙ 5NH3 
C)  [Co(NH3)4Cl]Cl2 ∙ NH3 
D)  [Co(NH3)5Cl]Cl2 
E)  [Co(NH3)4Cl2]Cl ∙ NH3

Question 13

The hexaaquachromium(III) ion absorbs light in the green part of the visible spectrum, thereby appearing to have the color:

Accepted Answer

A)  blue 
B)  cyan 
C)  green 
D)  purple 
E)  yellow 
A)  blue 
B)  cyan 
C)  green 
D)  purple 
E)  yellow

Question 14

Complex-ion formation can be described in terms of Br∅nsted-Lowry acid-base reactions.

Accepted Answer

A) True 
 B)False

Question 15

[CuCl4]2- absorbs light in the blue part of the visible spectrum, thereby appearing to have the color ________.

Accepted Answer

A)  blue 
B)  cyan 
C)  green 
D)  purple 
E)  yellow 
A)  blue 
B)  cyan 
C)  green 
D)  purple 
E)  yellow

Question 16

When [Ni(NH3)4]2+ is treated with concentrated HCl, two compounds having the same formula, Ni(NH3)4Cl2, designated I and II, are formed. Compound I can be converted to compound II by boiling it in dilute HCl. A solution of I reacts with oxalic acid, H2C2O4, to form Ni(NH3)4(C2O4). Compound II does not react with oxalic acid. Compound II is:

Accepted Answer

A)  the cis isomer 
B)  tetrahedral in shape 
C)  the trans isomer 
D)  the same as compound I 
E)  octahedral in shape 
A)  the cis isomer 
B)  tetrahedral in shape 
C)  the trans isomer 
D)  the same as compound I 
E)  octahedral in shape

Question 17

Choose the INCORRECT statement.

Accepted Answer

A)  A ligand that bonds to the metal ion with more than one atom is unidentate. 
B)  A chelate is produced by a ligand bonding to the metal ion with two or more donor atoms. 
C)  In coordination nomenclature, the cations are named before the anions. 
D)  In coordination nomenclature, the names of the ligands are followed by the name of the central metal ion. 
E)  Anionic ligands end in -o in coordination nomenclature. 
A)  A ligand that bonds to the metal ion with more than one atom is unidentate. 
B)  A chelate is produced by a ligand bonding to the metal ion with two or more donor atoms. 
C)  In coordination nomenclature, the cations are named before the anions. 
D)  In coordination nomenclature, the names of the ligands are followed by the name of the central metal ion. 
E)  Anionic ligands end in -o in coordination nomenclature.

Question 18

Which one of the following could be a chelating ligand?

Accepted Answer

A)  NH3 
B)  CH3-CH2-NH2 
C)  NH2-CH2-CH2-NH2 
D)  any metal ion 
E)  CN- 
A)  NH3 
B)  CH3-CH2-NH2 
C)  NH2-CH2-CH2-NH2 
D)  any metal ion 
E)  CN-

Question 19

Give the correct name for [Fe(H2O)4(OH)2]+.

Accepted Answer

A)  diaquotetrahydroxoiron(III) 
B)  tetrahydroxodiaquoferrate(III) 
C)  hydrated iron hydroxide 
D)  tetrawaterdihydroxoiron(III) 
E)  tetraaquadihydroxoiron(III) 
A)  diaquotetrahydroxoiron(III) 
B)  tetrahydroxodiaquoferrate(III) 
C)  hydrated iron hydroxide 
D)  tetrawaterdihydroxoiron(III) 
E)  tetraaquadihydroxoiron(III)

Question 20

Isomers such as the two forms of the ion [Co(NH3)2Cl4]- that differ only in the way the atoms are oriented in space are called, in general ________.

Accepted Answer

A)  ionization isomers 
B)  crystal field isomers 
C)  hybridization isomers 
D)  optical isomers 
E)  cis-trans isomers 
A)  ionization isomers 
B)  crystal field isomers 
C)  hybridization isomers 
D)  optical isomers 
E)  cis-trans isomers

Exam 24: Complex Ions and Coordination Compounds

Which of the following is a bidentate ligand?

Give the correct name for [AuF4]-.

As ethylenediamine is added to a solution of [Ni(H2O)6]2+, the water molecules are replaced two at a time by ethylenediamine to produce the sequence of ions: [Ni(H2O)6]2+, [Ni(en)(H2O)4]2+, [Ni(en)2(H2O)2]2+, and [Ni(en)3]2+. How does the color change through the sequence?

What is the concentration of Ni2+ if 0.223 g of NiCl2 is dissolved in 250.0 mL of 0.760 M NH3? Kf ([Ni(NH3)6]2+) = 5.5 × 108

It is known that the sulfhydryl group, -SH, forms strong coordinate bonds to certain heavy metal ions. Which of the following do you expect to be the best chelating agent for heavy metal ions?

What is the concentration of Zn2+ if 0.254 g of ZnCl2 is dissolved in 200.0 mL of 2.00 M NH3? Kf ([Zn(NH3)4]2+) = 4.1 × 108

In the cation [CoCl2(en)2]+, the oxidation state of cobalt and its coordination number, respectively, are ________.

Give the correct name for [Al(H2O)4]3+.

The net formation constant for tetrachloromercurate(II) ion is 1.2 × 1015. Calculate the approximate standard electrode potential for: [HgCl4]2-(aq) + 2 e- → Hg(l) + 4 Cl-(aq) Given: Hg2+(aq) + 2 e- → Hg(l) E° + 0.85 V

Which of the following metal ions has coordination numbers of 2 or 4?

A compound has the empirical formula CoCl3 ∙ 5NH3. One mole of it yields two moles of silver chloride when treated with silver nitrate. Ammonia is not removed by treatment with concentrated sulfuric acid. A reasonable formula for the compound is ________.

The hexaaquachromium(III) ion absorbs light in the green part of the visible spectrum, thereby appearing to have the color:

Complex-ion formation can be described in terms of Br∅nsted-Lowry acid-base reactions.

[CuCl4]2- absorbs light in the blue part of the visible spectrum, thereby appearing to have the color ________.

Choose the INCORRECT statement.

Which one of the following could be a chelating ligand?

Give the correct name for [Fe(H2O)4(OH)2]+.

Isomers such as the two forms of the ion [Co(NH3)2Cl4]- that differ only in the way the atoms are oriented in space are called, in general ________.

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Solutions and Their Physical Properties

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

What is the concentration of Ni²⁺ if 0.223 g of NiCl₂ is dissolved in 250.0 mL of 0.760 M NH₃? Kf ([Ni(NH₃)₆]²⁺) = 5.5 × 10⁸

What is the concentration of Zn₂+ if 0.254 g of ZnCl₂ is dissolved in 200.0 mL of 2.00 M NH₃? Kf ([Zn(NH₃)₄]₂+) = 4.1 × 10⁸

In the cation [CoCl₂(en)2]⁺, the oxidation state of cobalt and its coordination number, respectively, are ________.

Give the correct name for [Al(H₂O)₄]³⁺.

The net formation constant for tetrachloromercurate(II) ion is 1.2 × 10¹⁵. Calculate the approximate standard electrode potential for: [HgCl₄]^2-(aq) + 2 e- → Hg(l) + 4 Cl-(aq) Given: Hg₂+(aq) + 2 e- → Hg(l) E° + 0.85 V

A compound has the empirical formula CoCl₃ ∙ 5NH₃. One mole of it yields two moles of silver chloride when treated with silver nitrate. Ammonia is not removed by treatment with concentrated sulfuric acid. A reasonable formula for the compound is ________.

[CuCl₄]^2- absorbs light in the blue part of the visible spectrum, thereby appearing to have the color ________.

Give the correct name for [Fe(H₂O)₄(OH)₂]⁺.

Isomers such as the two forms of the ion [Co(NH₃)₂Cl₄]^- that differ only in the way the atoms are oriented in space are called, in general ________.