Question 1

Ligands approaching in an octahedral pattern cause some orbitals to be raised in energy. How many orbitals are on the higher energy level?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 2

Which combination of central species and net charge is FALSE for complex ions or coordination compounds?

Accepted Answer

A)  neutral metal atom, positive net charge 
B)  neutral metal atom, zero net charge 
C)  metal cation, zero net charge 
D)  metal cation, positive net charge 
E)  metal cation, negative net charge 
A)  neutral metal atom, positive net charge 
B)  neutral metal atom, zero net charge 
C)  metal cation, zero net charge 
D)  metal cation, positive net charge 
E)  metal cation, negative net charge

Question 3

Of the following complex ions: [CoCl(NH3)5]2+, [Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+, one appears pink, two are yellow, and one blue. Which is blue?

Accepted Answer

A)  [Co(NH3)6]3+ 
B)  [CoCl(NH3)5]2+ 
C)  [Co(H2O)6]3+ 
D)  [Co(en)3]3+ 
E)  both [Co(en)3]3+ and [Co(H2O)6]3+ 
A)  [Co(NH3)6]3+ 
B)  [CoCl(NH3)5]2+ 
C)  [Co(H2O)6]3+ 
D)  [Co(en)3]3+ 
E)  both [Co(en)3]3+ and [Co(H2O)6]3+

Question 4

The correct formula of triamminediaquachlorocobalt (III) iodide is ________.

Accepted Answer

A)  [Co(NH3)2(H2O)3Cl]I2 
B)  [Co(NH3)3(H2O)2Cl]I3 
C)  [Co(NH3)3(H2O)2Cl]I2 
D)  [Co(NH3)3(H2O)2Cl]I 
E)  [Co(NH3)3(H2O)2I]Cl2 
A)  [Co(NH3)2(H2O)3Cl]I2 
B)  [Co(NH3)3(H2O)2Cl]I3 
C)  [Co(NH3)3(H2O)2Cl]I2 
D)  [Co(NH3)3(H2O)2Cl]I 
E)  [Co(NH3)3(H2O)2I]Cl2

Question 5

What is the approximate concentration of free Ni2+ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl2 with 5.0 mL of 2.0 M NH3(aq)? [The net formation constant for the hexamminenickel(II) ion is 5.5 × 108.]

Accepted Answer

A)  1.8 × 10-9 M 
B)  7.7 × 10-10 M 
C)  1.3 × 10-10 M 
D)  2.4 × 10-10 M 
E)  0.050 M 
A)  1.8 × 10-9 M 
B)  7.7 × 10-10 M 
C)  1.3 × 10-10 M 
D)  2.4 × 10-10 M 
E)  0.050 M

Question 6

Complex-ions in which ligands are interchanged very slowly are called labile.

Accepted Answer

A) True 
 B)False

Question 7

What is the approximate concentration of free Ni2+ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl2 with 5.0 mL of 2.00 M ethylenediamine? [The net formation constant for the tris(ethylenediaminenickel(II) ion is 2.1 × 1018.]

Accepted Answer

A)  0.050 M 
B)  1.4 × 10-19 M 
C)  4.8 × 10-19 M 
D)  3.9 × 10-20 M 
E)  2.8 × 10-20 M 
A)  0.050 M 
B)  1.4 × 10-19 M 
C)  4.8 × 10-19 M 
D)  3.9 × 10-20 M 
E)  2.8 × 10-20 M

Question 8

What is the correct IUPAC name for K3[Co(NO2)6]?

Accepted Answer

A)  tripotassiumhexanitritocobalt(0) 
B)  tripotassiumhexanitritocobalt(III) 
C)  potassium hexanitritocobaltate(III) 
D)  potassium hexanitritocobalt(III) 
E)  potassium hexanitratocobalt(III) 
A)  tripotassiumhexanitritocobalt(0) 
B)  tripotassiumhexanitritocobalt(III) 
C)  potassium hexanitritocobaltate(III) 
D)  potassium hexanitritocobalt(III) 
E)  potassium hexanitratocobalt(III)

Question 9

If a central ion has a coordination number of 4 we might expect the geometry of the complex ion to be ________.

Accepted Answer

A)  octahedral 
B)  cubical 
C)  trigonal bipyramidal 
D)  square planar 
E)  trigonal planar 
A)  octahedral 
B)  cubical 
C)  trigonal bipyramidal 
D)  square planar 
E)  trigonal planar

Question 10

What is the concentration of Ag+ if 0.125 g of AgC2H3O2 is placed in 100.0 mL of 1.00 M NH3? Kf = 1.6 × 107 for [Ag(NH3)2]+

Accepted Answer

A)  4.8 × 10-10 M 
B)  5.6 × 10-10 M 
C)  8.0 × 10-8 M 
D)  8.3 × 10-6 M 
E)  7.5 × 10-3 M 
A)  4.8 × 10-10 M 
B)  5.6 × 10-10 M 
C)  8.0 × 10-8 M 
D)  8.3 × 10-6 M 
E)  7.5 × 10-3 M

Question 11

Sequestering is using a chelating agents to reduce a free cation concentration to the point that the cation will not react to form objectionable products.

Accepted Answer

A) True 
 B)False

Question 12

Choose the INCORRECT formula/name combination for ligands.

Accepted Answer

A)  Br- bromo 
B)  S2O32- sulfato 
C)  NO2- bonded to N nitrito-N- 
D)  NO2- bonded to O nitrito-O- 
E)  en ethylenediamine N2NCH2CH2NH2 
A)  Br- bromo 
B)  S2O32- sulfato 
C)  NO2- bonded to N nitrito-N- 
D)  NO2- bonded to O nitrito-O- 
E)  en ethylenediamine N2NCH2CH2NH2

Question 13

Write the correct formula for tetrachloroplatinate (II) ion.

Accepted Answer

A)  [PtCl4]2- 
B)  PtCl3Cl 
C)  [Pt4Cl]- 
D)  [PtCl3]-Cl- 
E)  [PtCl2]42+ 
A)  [PtCl4]2- 
B)  PtCl3Cl 
C)  [Pt4Cl]- 
D)  [PtCl3]-Cl- 
E)  [PtCl2]42+

Question 14

Of the following complex ions: [CrCl(NH3)5]2+, [Cr(NH3)6]3+, [CrCl(H2O)5]2+, [Cr(H2O)6]3+, one appears pink, one yellow, one blue-green and one violet. Which is blue-green?

Accepted Answer

A)  [Cr(NH3)6]3+ 
B)  [CrCl(NH3)5]2+ 
C)  [CrCl(H2O)5]2+ 
D)  [Cr(H2O)6]3+ 
E)  both [CrCl(H2O)5]2+ and [CrCl(NH3)5]2+ 
A)  [Cr(NH3)6]3+ 
B)  [CrCl(NH3)5]2+ 
C)  [CrCl(H2O)5]2+ 
D)  [Cr(H2O)6]3+ 
E)  both [CrCl(H2O)5]2+ and [CrCl(NH3)5]2+

Question 15

Which is the most plausible and consistent combination of hybrid orbital notation and magnetic/geometric description of [CoF6]3-?

Accepted Answer

A)  sp2d/diamagnetic/square planar 
B)  sp2d/paramagnetic/square planar 
C)  sp3d2/diamagnetic/octahedral 
D)  sp3d2/paramagnetic/octahedral 
E)  sp2d/paramagnetic/tetrahedral 
A)  sp2d/diamagnetic/square planar 
B)  sp2d/paramagnetic/square planar 
C)  sp3d2/diamagnetic/octahedral 
D)  sp3d2/paramagnetic/octahedral 
E)  sp2d/paramagnetic/tetrahedral

Question 16

Molecules which are nonsuperimposable mirror images of each other are called ________.

Accepted Answer

A)  achiralomers 
B)  enantiomers 
C)  diastereomers 
D)  cis/trans isomers 
E)  geometers 
A)  achiralomers 
B)  enantiomers 
C)  diastereomers 
D)  cis/trans isomers 
E)  geometers

Question 17

In the cation [CrCl2(H2O)4]+, the oxidation state of chromium and its coordination number, respectively, are ________.

Accepted Answer

A)  -3 and two 
B)  +3 and six 
C)  0 and four 
D)  +2 and six 
E)  -4 and six 
A)  -3 and two 
B)  +3 and six 
C)  0 and four 
D)  +2 and six 
E)  -4 and six

Question 18

A complex is any species involving coordination of ligands to a metal center.

Accepted Answer

A) True 
 B)False

Question 19

Some wavelengths of light are the correct energy to be used to promote electrons to higher energy levels and are thus lost from white light. The loss of these wavelengths causes solutions of transition elements to be colored.

Accepted Answer

A) True 
 B)False

Question 20

Based on concepts from both crystal field theory and valence bond theory, the most likely combination of molecular orbital, magnetic and geometric descriptions for the [Fe(H2O)6]2+ ion is ________.

Accepted Answer

A)  sp2d/diamagnetic/square planar 
B)  sp2d/paramagnetic/square planar 
C)  sp3d2/diamagnetic/octahedral 
D)  sp3d2/paramagnetic/octahedral 
E)  sp2d/paramagnetic/tetrahedral 
A)  sp2d/diamagnetic/square planar 
B)  sp2d/paramagnetic/square planar 
C)  sp3d2/diamagnetic/octahedral 
D)  sp3d2/paramagnetic/octahedral 
E)  sp2d/paramagnetic/tetrahedral

Exam 24: Complex Ions and Coordination Compounds

Ligands approaching in an octahedral pattern cause some orbitals to be raised in energy. How many orbitals are on the higher energy level?

Which combination of central species and net charge is FALSE for complex ions or coordination compounds?

Of the following complex ions: [CoCl(NH3)5]2+, [Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+, one appears pink, two are yellow, and one blue. Which is blue?

The correct formula of triamminediaquachlorocobalt (III) iodide is ________.

What is the approximate concentration of free Ni2+ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl2 with 5.0 mL of 2.0 M NH3(aq)? [The net formation constant for the hexamminenickel(II) ion is 5.5 × 108.]

Complex-ions in which ligands are interchanged very slowly are called labile.

What is the approximate concentration of free Ni2+ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl2 with 5.0 mL of 2.00 M ethylenediamine? [The net formation constant for the tris(ethylenediaminenickel(II) ion is 2.1 × 1018.]

What is the correct IUPAC name for K3[Co(NO2)6]?

If a central ion has a coordination number of 4 we might expect the geometry of the complex ion to be ________.

What is the concentration of Ag+ if 0.125 g of AgC2H3O2 is placed in 100.0 mL of 1.00 M NH3? Kf = 1.6 × 107 for [Ag(NH3)2]+

Sequestering is using a chelating agents to reduce a free cation concentration to the point that the cation will not react to form objectionable products.

Choose the INCORRECT formula/name combination for ligands.

Write the correct formula for tetrachloroplatinate (II) ion.

Of the following complex ions: [CrCl(NH3)5]2+, [Cr(NH3)6]3+, [CrCl(H2O)5]2+, [Cr(H2O)6]3+, one appears pink, one yellow, one blue-green and one violet. Which is blue-green?

Which is the most plausible and consistent combination of hybrid orbital notation and magnetic/geometric description of [CoF6]3-?

Molecules which are nonsuperimposable mirror images of each other are called ________.

In the cation [CrCl2(H2O)4]+, the oxidation state of chromium and its coordination number, respectively, are ________.

A complex is any species involving coordination of ligands to a metal center.

Some wavelengths of light are the correct energy to be used to promote electrons to higher energy levels and are thus lost from white light. The loss of these wavelengths causes solutions of transition elements to be colored.

Based on concepts from both crystal field theory and valence bond theory, the most likely combination of molecular orbital, magnetic and geometric descriptions for the [Fe(H2O)6]2+ ion is ________.

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

Of the following complex ions: [CoCl(NH₃)₅]²⁺, [Co(NH₃)₆]³⁺, [Co(en)₃]³⁺, [Co(H₂O)₆]³⁺, one appears pink, two are yellow, and one blue. Which is blue?

What is the approximate concentration of free Ni²⁺ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl₂ with 5.0 mL of 2.0 M NH₃(aq)? [The net formation constant for the hexamminenickel(II) ion is 5.5 × 10⁸.]

What is the approximate concentration of free Ni²⁺ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M NiCl₂ with 5.0 mL of 2.00 M ethylenediamine? [The net formation constant for the tris(ethylenediaminenickel(II) ion is 2.1 × 10¹⁸.]

What is the correct IUPAC name for K₃[Co(NO₂)₆]?

What is the concentration of Ag⁺ if 0.125 g of AgC₂H₃O₂ is placed in 100.0 mL of 1.00 M NH₃? Kf = 1.6 × 10⁷ for [Ag(NH₃)₂]⁺

Of the following complex ions: [CrCl(NH₃)₅]²⁺, [Cr(NH₃)6]³⁺, [CrCl(H₂O)₅]²⁺, [Cr(H₂O)₆]³⁺, one appears pink, one yellow, one blue-green and one violet. Which is blue-green?

In the cation [CrCl₂(H₂O)₄]⁺, the oxidation state of chromium and its coordination number, respectively, are ________.

Based on concepts from both crystal field theory and valence bond theory, the most likely combination of molecular orbital, magnetic and geometric descriptions for the [Fe(H₂O)₆]²⁺ ion is ________.