Question 1

Assuming a coordination complex is formed with Fe2+ and 1,10-phenanthroline (shown below), which of the following statements is true?

Accepted Answer

A) If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 2. 
B) If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6. 
C) If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 3. 
D) If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6. 
E) If four 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 4. 
A) If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 2. 
B) If two 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6. 
C) If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 3. 
D) If three 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 6. 
E) If four 1,10-phenanthroline molecules are coordinated to the iron ion, then the coordination number is 4.

Question 2

In transition metal complexes, the metal ions are Lewis acids.

Accepted Answer

A) True 
 B)False

Question 3

Which of these ligands produces the strongest crystal field?

Accepted Answer

A) Cl- 
B) CO 
C) OH- 
D) H2O 
E) NH3 
A) Cl- 
B) CO 
C) OH- 
D) H2O 
E) NH3

Question 4

What is the coordination number of chromium in Cr(en)2Cl2?

Accepted Answer

Question 5

What terms describe the geometric isomers that are possible for the complex [CrF2Cl4]3-?

Accepted Answer

Question 6

The electron configuration of an Fe2+ ion is

Accepted Answer

A) [Ar]4s24d4. 
B) [Ar]4s23d6. 
C) [Ar]3d3. 
D) [Ar]3d5. 
E) [Ar]3d6. 
A) [Ar]4s24d4. 
B) [Ar]4s23d6. 
C) [Ar]3d3. 
D) [Ar]3d5. 
E) [Ar]3d6.

Question 7

In the complex ion [Co(en)2Br2]+, the oxidation number of Co is

Accepted Answer

A) +1. 
B) +2. 
C) +3. 
D) -2. 
E) -1. 
A) +1. 
B) +2. 
C) +3. 
D) -2. 
E) -1.

Question 8

Two well-known complex ions containing Ni are [Ni(H2O)6]2+, which is green, and [Ni(en)3]2+, which is purple. Which one of these statements is true?

Accepted Answer

A) The crystal field splitting energy ($\Delta$)is greater for [Ni(en)3]2+ than for [Ni(H2O)6]2+. 
B) [Ni(en)3]2+ absorbs energy in the red region of the spectrum. 
C) Both complex ions are diamagnetic. 
D) [Ni(H2O)6]2+ transmits light with wavelengths of approximately 650-700 nm. 
E) The green complex absorbs green light. 
A) The crystal field splitting energy ($\Delta$)is greater for [Ni(en)3]2+ than for [Ni(H2O)6]2+. 
B) [Ni(en)3]2+ absorbs energy in the red region of the spectrum. 
C) Both complex ions are diamagnetic. 
D) [Ni(H2O)6]2+ transmits light with wavelengths of approximately 650-700 nm. 
E) The green complex absorbs green light.

Question 9

Copper can be separated from iron in the ore chalcopyrite (CuFeS2)by heating the ore in the presence of oxygen to form copper(I)sulfide, iron(II)oxide, and sulfur dioxide.Write a balanced chemical equation for this process.

Accepted Answer

2CuFeS₂(s)+ 4O₂(g)

Question 10

Consider the [CoCl6]4- ion. Which response includes all the following statements that are true and no false statements? I.The oxidation number of Co is -4.
II. The coordination number of cobalt is 6.
III.It is paramagnetic.
IV.It is a low-spin complex.

Accepted Answer

A) I, II, III, IV 
B) I, IV 
C) II, III 
D) I, III 
E) III, IV 
A) I, II, III, IV 
B) I, IV 
C) II, III 
D) I, III 
E) III, IV

Question 11

The neutral monodentate ligand L forms the complex ion [CrL6]2+, and the magnetic properties of this complex correspond to 2 unpaired electrons.Is L a strong-field or weak-field ligand? Explain your reasoning.

Accepted Answer

L is a strong-field ligand.Reasoning (an

Question 12

How many 3d electrons does a V3+ ion have?

Accepted Answer

A) 6 
B) 5 
C) 4 
D) 3 
E) 2 
A) 6 
B) 5 
C) 4 
D) 3 
E) 2

Question 13

Which of these electron energy level patterns would absorb light with the shortest wavelength?

Accepted Answer

The answer of Which of these electron energy level patterns...

Question 14

The oxidation number of Co in [Co(NH3)4Cl2]Cl is +1.

Accepted Answer

A) True 
 B)False

Question 15

A complex with the composition [MA2B2]X2 is found to have no geometrical isomers. Both A and B are monodentate ligands. The structure of the complex is

Accepted Answer

A) linear. 
B) square planar. 
C) tetrahedral. 
D) octahedral. 
A) linear. 
B) square planar. 
C) tetrahedral. 
D) octahedral.

Question 16

A molecule or ion that provides an electron pair for coordinate covalent bond formation is called a Lewis ________.

Accepted Answer

The answer of A molecule or ion that provides an...

Question 17

The total number of electrons in the 3d orbitals of a titanium atom is

Accepted Answer

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

Question 18

Name the complex ion [Ni(CN)4]2-.

Accepted Answer

tetracyano

Question 19

What is the coodination number of silver in [Ag(NH3)2]Cl?

Accepted Answer

Question 20

Give the coordination number (C.N.)and oxidation number (O.N.)of the metal atom in the coordination compound [Cr(NH3)2(en)Cl2].

Accepted Answer

A) C.N.= 4; O.N.= +2. 
B) C.N.= 5; O.N.= +3. 
C) C.N.= 5; O.N.= +2. 
D) C.N.= 6; O.N.= +3. 
E) C.N.= 6; O.N.= +2. 
A) C.N.= 4; O.N.= +2. 
B) C.N.= 5; O.N.= +3. 
C) C.N.= 5; O.N.= +2. 
D) C.N.= 6; O.N.= +3. 
E) C.N.= 6; O.N.= +2.

Exam 22: Transition Metal Chemistry and Coordination Compounds

Assuming a coordination complex is formed with Fe2+ and 1,10-phenanthroline (shown below), which of the following statements is true?

In transition metal complexes, the metal ions are Lewis acids.

Which of these ligands produces the strongest crystal field?

What is the coordination number of chromium in Cr(en)2Cl2?

What terms describe the geometric isomers that are possible for the complex [CrF2Cl4]3-?

The electron configuration of an Fe2+ ion is

In the complex ion [Co(en)2Br2]+, the oxidation number of Co is

Two well-known complex ions containing Ni are [Ni(H2O)6]2+, which is green, and [Ni(en)3]2+, which is purple. Which one of these statements is true?

Copper can be separated from iron in the ore chalcopyrite (CuFeS2)by heating the ore in the presence of oxygen to form copper(I)sulfide, iron(II)oxide, and sulfur dioxide.Write a balanced chemical equation for this process.

Consider the [CoCl6]4- ion. Which response includes all the following statements that are true and no false statements? I.The oxidation number of Co is -4. II. The coordination number of cobalt is 6. III.It is paramagnetic. IV.It is a low-spin complex.

The neutral monodentate ligand L forms the complex ion [CrL6]2+, and the magnetic properties of this complex correspond to 2 unpaired electrons.Is L a strong-field or weak-field ligand? Explain your reasoning.

How many 3d electrons does a V3+ ion have?

Which of these electron energy level patterns would absorb light with the shortest wavelength?

The oxidation number of Co in [Co(NH3)4Cl2]Cl is +1.

A complex with the composition [MA2B2]X2 is found to have no geometrical isomers. Both A and B are monodentate ligands. The structure of the complex is

A molecule or ion that provides an electron pair for coordinate covalent bond formation is called a Lewis ________.

The total number of electrons in the 3d orbitals of a titanium atom is

Name the complex ion [Ni(CN)4]2-.

What is the coodination number of silver in [Ag(NH3)2]Cl?

Give the coordination number (C.N.)and oxidation number (O.N.)of the metal atom in the coordination compound [Cr(NH3)2(en)Cl2].

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Assuming a coordination complex is formed with Fe²⁺ and 1,10-phenanthroline (shown below), which of the following statements is true?

What is the coordination number of chromium in Cr(en)₂Cl₂?

What terms describe the geometric isomers that are possible for the complex [CrF₂Cl₄]^3-?

The electron configuration of an Fe²⁺ ion is

In the complex ion [Co(en)₂Br₂]⁺, the oxidation number of Co is

Two well-known complex ions containing Ni are [Ni(H₂O)₆]²⁺, which is green, and [Ni(en)₃]²⁺, which is purple. Which one of these statements is true?

Copper can be separated from iron in the ore chalcopyrite (CuFeS₂)by heating the ore in the presence of oxygen to form copper(I)sulfide, iron(II)oxide, and sulfur dioxide.Write a balanced chemical equation for this process.

Consider the [CoCl₆]^4- ion. Which response includes all the following statements that are true and no false statements? I.The oxidation number of Co is -4. II. The coordination number of cobalt is 6. III.It is paramagnetic. IV.It is a low-spin complex.

The neutral monodentate ligand L forms the complex ion [CrL₆]²⁺, and the magnetic properties of this complex correspond to 2 unpaired electrons.Is L a strong-field or weak-field ligand? Explain your reasoning.

How many 3d electrons does a V³⁺ ion have?

The oxidation number of Co in [Co(NH₃)₄Cl₂]Cl is +1.

A complex with the composition [MA₂B₂]X₂ is found to have no geometrical isomers. Both A and B are monodentate ligands. The structure of the complex is

Name the complex ion [Ni(CN)₄]^2-.

What is the coodination number of silver in [Ag(NH₃)₂]Cl?

Give the coordination number (C.N.)and oxidation number (O.N.)of the metal atom in the coordination compound [Cr(NH₃)₂(en)Cl₂].