Question 1

Which of these ligands produces the weakest crystal field

Accepted Answer

A)   CN-
B)   I-
C)   OH-
D)   H2O
E)   NH3F) B) and C)
G) B) and E)

Question 2

What is the oxidation number of Co in the complex Co(H2O) 3Cl3

Accepted Answer

A)   +1
B)   +2
C)   +3
D)   +4
E)   None of the aboveF) All of the above
G) A) and B)

Question 3

Which of the following complexes has optical (chiral)  isomers

Accepted Answer

A)   [Co(H2O) 4Br2]+
B)   [Co(en) Cl4]-
C)   [Co(en) (H2O) 4]3+
D)   [Co(en) 2Cl2]+
E)   Co(H2O) 3Cl3F) D) and E)
G) C) and D)

Question 4

Predict the number of unpaired electrons in the [Cr(en) 3]2+ ion.

Accepted Answer

A)   0
B)   1
C)   3
D)   5
E)   None of the aboveF) C) and D)
G) None of the above

Question 5

The correct name of the complex ion [CuCl3Br(NH3)2]2- is:
diamminebromotrichlorocuprate(I) ion

Accepted Answer

A) True 
 B)False

Question 6

In the coordination compound [Co(en) 2Cl2]Cl, the coordination number and oxidation number of the central atom are, respectively,

Accepted Answer

A)   4, +3.
B)   6, +2.
C)   4, +2.
D)   6, +3.
E)   4, +1.F) C) and E)
G) A) and B)

Question 7

Cis-platinum complexes are

Accepted Answer

A)   used in the extraction of silver and gold.
B)   effective antidotes for heavy metal poisoning (e.g., Pb2+ and Hg2+) .
C)   used to provide nutrients for plants.
D)   used to prevent eutrophication of lakes.
E)   effective antitumor agents.F) A) and B)
G) A) and C) E

Question 8

What is the oxidation number of Fe in [Fe(CN) 6]4-

Accepted Answer

A)   +1
B)   +2
C)   +3
D)   +4
E)   None of the aboveF) B) and D)
G) A) and E) B

Question 9

Assuming a coordination complex is formed with Fe2+ and 1,10-phenanthroline (shown below) , which of the following statements is true 2+ and 1,10-phenanthroline (shown below) , which of the following statements is true   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." class="answers-bank-image d-inline" rel="preload" >

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.F) C) and D)
G) A) and B)

Question 10

Predict the number of unpaired electrons in the [Fe(CN) 6]4- ion.

Accepted Answer

A)   0
B)   1
C)   3
D)   5
E)   None of the aboveF) C) and D)
G) A) and E)

Question 11

How many unpaired electrons are there in the complex ion [Mn(CN) 6]3-

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) A) and B)
G) B) and D)

Question 12

The terms that describe the geometric isomers that are possible for the complex [CrF2Cl4]3- are cis and trans.

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

A)   6.
B)   7.
C)   8.
D)   9.
E)   10.F) D) and E)
G) All of the above

Question 14

In the coordination compound K2[Co(en) Cl4], the coordination number (C.N.)  and oxidation number (O.N.)  of cobalt are

Accepted Answer

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

Question 15

Bidentate and polydentate ligands are also called chelating agents.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following complexes has optical (chiral)  isomers

Accepted Answer

A)   [Co(NH3) 4Br2]+
B)   [Co(en) 3]3+
C)   Co(NH3) 3Br3
D)   [Co(en) Br4]-
E)   [Co(en) (NH3) 4]3+F) B) and D)
G) All of the above

Question 17

In the complex ion [ML6]n+, Mn+ has six d electrons and L is a weak field ligand. According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   4F) A) and B)
G) B) and E)

Question 18

The total number of electrons in the 3d orbitals of Co3+ is

Accepted Answer

A)   4.
B)   5.
C)   6.
D)   7.
E)   10.F) A) and B)
G) B) and D) C

Question 19

In the complex ion [ML6]n+, Mn+ has five d electrons and L is a strong field ligand. According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons

Accepted Answer

A)   0
B)   1
C)   2
D)   3
E)   5F) A) and B)
G) B) and C)

Question 20

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

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) C) and D)
F) A) and B)

Exam 23: Transition Metals Chemistry and Coordination Compounds

Which of these ligands produces the weakest crystal field

Correct AnswerverifiedShow Answer

What is the oxidation number of Co in the complex Co(H2O) 3Cl3

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Which of the following complexes has optical (chiral) isomers

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Predict the number of unpaired electrons in the [Cr(en) 3]2+ ion.

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The correct name of the complex ion [CuCl3Br(NH3)2]2- is: diamminebromotrichlorocuprate(I) ion

Correct AnswerverifiedShow Answer

In the coordination compound [Co(en) 2Cl2]Cl, the coordination number and oxidation number of the central atom are, respectively,

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Cis-platinum complexes are

Correct AnswerverifiedE

What is the oxidation number of Fe in [Fe(CN) 6]4-

Correct AnswerverifiedB

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

Correct AnswerverifiedShow Answer

Predict the number of unpaired electrons in the [Fe(CN) 6]4- ion.

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How many unpaired electrons are there in the complex ion [Mn(CN) 6]3-

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The terms that describe the geometric isomers that are possible for the complex [CrF2Cl4]3- are cis and trans.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In the coordination compound K2[Co(en) Cl4], the coordination number (C.N.) and oxidation number (O.N.) of cobalt are

Correct AnswerverifiedShow Answer

Bidentate and polydentate ligands are also called chelating agents.

Correct AnswerverifiedShow Answer

Which of the following complexes has optical (chiral) isomers

Correct AnswerverifiedShow Answer

In the complex ion [ML6]n+, Mn+ has six d electrons and L is a weak field ligand. According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons

Correct AnswerverifiedShow Answer

The total number of electrons in the 3d orbitals of Co3+ is

Correct AnswerverifiedC

In the complex ion [ML6]n+, Mn+ has five d electrons and L is a strong field ligand. According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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What is the oxidation number of Co in the complex Co(H₂O) ₃Cl₃

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Predict the number of unpaired electrons in the [Cr(en) ₃]²⁺ ion.

Correct Answer
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The correct name of the complex ion [CuCl₃Br(NH₃)₂]^2- is: diamminebromotrichlorocuprate(I) ion

Correct Answer
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In the coordination compound [Co(en) ₂Cl₂]Cl, the coordination number and oxidation number of the central atom are, respectively,

Correct Answer
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E

What is the oxidation number of Fe in [Fe(CN) ₆]^4-

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B

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

Correct Answer
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Predict the number of unpaired electrons in the [Fe(CN) ₆]^4- ion.

Correct Answer
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How many unpaired electrons are there in the complex ion [Mn(CN) ₆]^3-

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The terms that describe the geometric isomers that are possible for the complex [CrF₂Cl₄]^3- are cis and trans.

Correct Answer
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In the coordination compound K₂[Co(en) Cl₄], the coordination number (C.N.) and oxidation number (O.N.) of cobalt are

Correct Answer
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In the complex ion [ML₆]ⁿ⁺, Mⁿ⁺ has six d electrons and L is a weak field ligand. According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons

Correct Answer
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The total number of electrons in the 3d orbitals of Co³⁺ is

Correct Answer
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C

In the complex ion [ML₆]ⁿ⁺, Mⁿ⁺ has five d electrons and L is a strong field ligand. According to crystal field theory, the magnetic properties of the complex ion correspond to how many unpaired electrons

Correct Answer
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Correct Answer
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