Question 1

Why are Zn2+ ions colorless in water?

Accepted Answer

A)  they don't form coordination complexes with water. 
B)  the Zn2+/H2O coordination complexes have filled d orbitals. 
C)  the Zn2+/H2O coordination complexes are all paramagnetic. 
D)  the Zn2+/H2O coordination complexes are all tetrahedral. 
E)  none of the above 
A)  they don't form coordination complexes with water. 
B)  the Zn2+/H2O coordination complexes have filled d orbitals. 
C)  the Zn2+/H2O coordination complexes are all paramagnetic. 
D)  the Zn2+/H2O coordination complexes are all tetrahedral. 
E)  none of the above

Question 2

The octahedral complex [Co(H2O)6]3+ has an absorption at 549 nm. Based on this where do you think the absorption will be for [Co(NH3)6]3+ might be?

Accepted Answer

A)  590 nm 
B)  437 nm 
C)  549 nm 
D)  It won't have an absorption because it will be a high spin complex. 
E)  There is no way to predict. 
A)  590 nm 
B)  437 nm 
C)  549 nm 
D)  It won't have an absorption because it will be a high spin complex. 
E)  There is no way to predict.

Question 3

[Cu(CF3)4]- is found to be diamagnetic. What is its structure?

Accepted Answer

A)  square planar 
B)  tetrahedral 
C)  either square planar or tetrahedral 
D)  octahedral (with two other water ligands) 
E)  it will be an unusual shape with a steric number of 8 
A)  square planar 
B)  tetrahedral 
C)  either square planar or tetrahedral 
D)  octahedral (with two other water ligands) 
E)  it will be an unusual shape with a steric number of 8

Question 4

A Zn2+ ion in a strong octahedral field will have how many unpaired electrons?

Accepted Answer

A)  0 
B)  2 
C)  3 
D)  4 
E)  8 
A)  0 
B)  2 
C)  3 
D)  4 
E)  8

Question 5

The enthalpy of hydration for a metal ion is

Accepted Answer

A)  equal to the energy associated with the hydration of the gas phase metal ion 
B)  equal to the ionization energy of the neutral metal atom 
C)  always positive 
D)  always negative 
E)  A and D 
A)  equal to the energy associated with the hydration of the gas phase metal ion 
B)  equal to the ionization energy of the neutral metal atom 
C)  always positive 
D)  always negative 
E)  A and D

Question 6

What is the name of this compound, NbO2?

Accepted Answer

A)  Niobium (II) oxide 
B)  Niobium (III) oxide 
C)  Niobium (IV) oxide 
D)  Oxygen Niobate 
E)  Dioxygen Niobate 
A)  Niobium (II) oxide 
B)  Niobium (III) oxide 
C)  Niobium (IV) oxide 
D)  Oxygen Niobate 
E)  Dioxygen Niobate

Question 7

Given that [Ni(NH3)6]2+ has an absorption at 926 nm and [Cr(NH3)6]3+ has an absorption at 463 nm, what is the ratio of Do in the nickel compound compared to the chromium compound

Accepted Answer

A)  Do in the nickel compound is 2 times that of the chromium compound 
B)  Do in the nickel compound is 0.5 times that of the chromium compound 
C)  Do in the nickel compound is 4 times that of the chromium compound 
D)  Do in the nickel compound is 0.25 times that of the chromium compound 
E)  Do is the same as they have the same ligands 
A)  Do in the nickel compound is 2 times that of the chromium compound 
B)  Do in the nickel compound is 0.5 times that of the chromium compound 
C)  Do in the nickel compound is 4 times that of the chromium compound 
D)  Do in the nickel compound is 0.25 times that of the chromium compound 
E)  Do is the same as they have the same ligands

Question 8

What is the chemical formula of potassium hexafluorocobaltate(III)?

Accepted Answer

A)  [CoK]F6 
B)  K[CoF6] 
C)  K[CoF6]3 
D)  K3[CoF6] 
E)  K[Co3F6] 
A)  [CoK]F6 
B)  K[CoF6] 
C)  K[CoF6]3 
D)  K3[CoF6] 
E)  K[Co3F6]

Question 9

[Co(H2O)6]3+ absorbs at 549 nm while [V(H2O)6]2+ absorbs at 806 nm.

Accepted Answer

A)  Do is larger for the Vanadium compound 
B)  Do is smaller for the Vanadium compound 
C)  Do is the same for the two compounds because they have the same ligands 
D)  there is no way to compare Do for the two compounds from the data given 
A)  Do is larger for the Vanadium compound 
B)  Do is smaller for the Vanadium compound 
C)  Do is the same for the two compounds because they have the same ligands 
D)  there is no way to compare Do for the two compounds from the data given

Question 10

Which of the following statements is true for crystal field theory of an octahedral complex?

Accepted Answer

A)  The dxy, dyz, dxz orbitals are lower in energy than the dz2, and the dx2-y2 because they are unaffected by the ligand field. 
B)  The dxy, dyz, dxz orbitals are lower in energy than the dz2, and the dx2- because their energy is increased less than the dz2, and the dx2-y2. 
C)  in low spin complexes the dz2, and the dx2-y2 are lower in energy than the dxy, dyz, dxz orbitals. 
D)  a & c 
E)  b & c 
A)  The dxy, dyz, dxz orbitals are lower in energy than the dz2, and the dx2-y2 because they are unaffected by the ligand field. 
B)  The dxy, dyz, dxz orbitals are lower in energy than the dz2, and the dx2- because their energy is increased less than the dz2, and the dx2-y2. 
C)  in low spin complexes the dz2, and the dx2-y2 are lower in energy than the dxy, dyz, dxz orbitals. 
D)  a & c 
E)  b & c

Question 11

Which would you expect to have a lower melting temperature CrF2 or CrF5?

Accepted Answer

A)  CrF2 
B)  CrF5 
C)  they will be approximately the same 
D)  they will be exactly the same 
A)  CrF2 
B)  CrF5 
C)  they will be approximately the same 
D)  they will be exactly the same

Question 12

How many optical isomers are there for the square planar compound diaminedichloroplatinum (II)?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  3 
E)  4 
A)  0 
B)  1 
C)  2 
D)  3 
E)  4

Question 13

[Cr(CN)6]3- absorbs at 376 nm. Given that D0 in [Co(NH3)6]3+ is 1.23 time smaller than D0 in [Co(CN)6]3-, where to you think the compound D0 in [Co(NH3)6]3+ will absorb?

Accepted Answer

A)  253 nm 
B)  278 nm 
C)  311 nm 
D)  452 nm 
E)  463 nm 
A)  253 nm 
B)  278 nm 
C)  311 nm 
D)  452 nm 
E)  463 nm

Why are Zn²⁺ ions colorless in water?

The octahedral complex [Co(H₂O)₆]³⁺ has an absorption at 549 nm. Based on this where do you think the absorption will be for [Co(NH₃)₆]³⁺might be?

[Cu(CF₃)₄]^- is found to be diamagnetic. What is its structure?

A Zn²⁺ ion in a strong octahedral field will have how many unpaired electrons?

The enthalpy of hydration for a metal ion is

What is the name of this compound, NbO₂?

Given that [Ni(NH₃)₆]²⁺ has an absorption at 926 nm and [Cr(NH₃)₆]³⁺ has an absorption at 463 nm, what is the ratio of D_o in the nickel compound compared to the chromium compound

What is the chemical formula of potassium hexafluorocobaltate(III)?

[Co(H₂O)₆]³⁺ absorbs at 549 nm while [V(H₂O)₆]²⁺ absorbs at 806 nm.

Which of the following statements is true for crystal field theory of an octahedral complex?

Which would you expect to have a lower melting temperature CrF₂ or CrF₅?

How many optical isomers are there for the square planar compound diaminedichloroplatinum (II)?

[Cr(CN)₆]³^- absorbs at 376 nm. Given that D₀ in [Co(NH₃)₆]³⁺ is 1.23 time smaller than D₀ in [Co(CN)₆]³^-, where to you think the compound D₀ in [Co(NH₃)₆]³⁺ will absorb?

The Atom in Modern Chemistry

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

The Gaseous State

Solids, Liquids, and Phase Transitions

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Structure and Bonding in Solids

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

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Exam 8: Binding in Transition Metal Compounds and Coordination Complexes

Why are Zn2+ ions colorless in water?

The octahedral complex [Co(H2O)6]3+ has an absorption at 549 nm. Based on this where do you think the absorption will be for [Co(NH3)6]3+ might be?

[Cu(CF3)4]- is found to be diamagnetic. What is its structure?

A Zn2+ ion in a strong octahedral field will have how many unpaired electrons?

The enthalpy of hydration for a metal ion is

What is the name of this compound, NbO2?

Given that [Ni(NH3)6]2+ has an absorption at 926 nm and [Cr(NH3)6]3+ has an absorption at 463 nm, what is the ratio of Do in the nickel compound compared to the chromium compound

What is the chemical formula of potassium hexafluorocobaltate(III)?

[Co(H2O)6]3+ absorbs at 549 nm while [V(H2O)6]2+ absorbs at 806 nm.

Which of the following statements is true for crystal field theory of an octahedral complex?

Which would you expect to have a lower melting temperature CrF2 or CrF5?

How many optical isomers are there for the square planar compound diaminedichloroplatinum (II)?

[Cr(CN)6]3- absorbs at 376 nm. Given that D0 in [Co(NH3)6]3+ is 1.23 time smaller than D0 in [Co(CN)6]3-, where to you think the compound D0 in [Co(NH3)6]3+ will absorb?

The Atom in Modern Chemistry

Chemical Formulas, Equations, and Reaction Yields

Chemical Bonding: the Classical Description

Introduction to Quantum Mechanics

Quantum Mechanics and Atomic Structure

Quantum Mechanics and Molecular Structure

Bonding in Organic Molecules

The Gaseous State

Solids, Liquids, and Phase Transitions

Solutions

Thermodynamic Processes and Thermochemistry

Spontaneous Processes and Thermodynamic Equilibrium

Chemical Equilibrium

Acid-Base Equilibria

Solubility and Precipitation Equilibria

Electrochemistry

Chemical Kinetics

Nuclear Chemistry

Molecular Spectroscopy and Photochemistry

Structure and Bonding in Solids

Inorganic Materials

Polymeric Materials and Soft Condensed Matter

Filters

Why are Zn²⁺ ions colorless in water?

The octahedral complex [Co(H₂O)₆]³⁺ has an absorption at 549 nm. Based on this where do you think the absorption will be for [Co(NH₃)₆]³⁺might be?

[Cu(CF₃)₄]^- is found to be diamagnetic. What is its structure?

A Zn²⁺ ion in a strong octahedral field will have how many unpaired electrons?

What is the name of this compound, NbO₂?

Given that [Ni(NH₃)₆]²⁺ has an absorption at 926 nm and [Cr(NH₃)₆]³⁺ has an absorption at 463 nm, what is the ratio of D_o in the nickel compound compared to the chromium compound

[Co(H₂O)₆]³⁺ absorbs at 549 nm while [V(H₂O)₆]²⁺ absorbs at 806 nm.

Which would you expect to have a lower melting temperature CrF₂ or CrF₅?

[Cr(CN)₆]³^- absorbs at 376 nm. Given that D₀ in [Co(NH₃)₆]³⁺ is 1.23 time smaller than D₀ in [Co(CN)₆]³^-, where to you think the compound D₀ in [Co(NH₃)₆]³⁺ will absorb?