Question 1

In the complex ion [Fe(CN) 6]4-, the oxidation number of Fe is

Accepted Answer

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

Question 2

The correct formula for the dichlorobis(ethylenediamine) chromium(III) ion is

Accepted Answer

A)  [Cr(en) 2Cl2]3+.
B)  [Cr(en) Cl2]+.
C)  [Cr(en) 2Cl2]2+.
D)  [Cr(en) 2Cl2]+.
E)  [Cr(en) 3Cl2]+.F) A) and E)
G) C) and D)

Question 3

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

Question 4

In the following pair of complex ions, choose the one that absorbs light at a longer wavelength.

Accepted Answer

A)  [Co(H2O) 6]2+
B)  [Co(NH3) 6]2+C) A) and B)
D) undefined

Question 5

How many geometric isomers are possible for the complex [CrF3Br3]3-? Draw these isomers.

Accepted Answer

Two geometric isomer...

Question 6

A molecule or atom that accepts an electron pair to form a coordinate covalent bond is called a Lewis _______.

Accepted Answer

The answer of A molecule or atom that accepts an...

Question 7

In the following pair of complex ions, choose the one that absorbs light at a shorter wavelength.

Accepted Answer

A)  [Co(NH) 6]3+
B)  [CoCl6]3-C) A) and B)
D) undefined

Question 8

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

Accepted Answer

Question 9

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

Question 10

The correct formula for the dibromobis(oxalato)cobaltate(III)ion is [Co(C2O4)Br2]3+.

Accepted Answer

A) True 
 B)False

Question 11

Give (a)the oxidation number of the metal, (b)the number of d electrons, (c)the coordination number, (d)the charge of the complex ion, and (e)the number and type of ligands for the coordination compound shown below.

Accepted Answer

(a)+3, (b)3 d electr...

Question 12

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

Accepted Answer

A) True 
 B)False  False

Question 13

How would you expect the molecule 1,10-phenanthroline (shown below) to function as a ligand?

Accepted Answer

A)  It would be expected to be a monodentate ligand.
B)  It would be expected to be a bidentate ligand.
C)  It would be expected to be a tridentate ligand.
D)  It would be expected to be a tetradentate ligand.
E)  It would not be expected to function as a ligand.F) C) and D)
G) A) and E)

Question 14

Labile complexes are coordination complexes that

Accepted Answer

A)  are labeled with a radioactive isotope.
B)  are thermodynamically stable.
C)  are thermodynamically unstable.
D)  undergo rapid ligand exchange reactions.
E)  undergo very slow ligand exchange reactions.F) None of the above
G) B) and C)

Question 15

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 ( Δ\DeltaΔ ) 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. F) A) and D)
G) A) and C)

Question 16

In the complex ion [Cr(C2O4) 2(H2O) 2]-, the oxidation number of Cr is

Accepted Answer

A)  +1.
B)  +2.
C)  +3.
D)  -2.
E)  -1.F) D) and E)
G) All of the above C

Question 17

How many unpaired electrons does the manganese ion have in [Mn(CN) 6]4- ?

Accepted Answer

A)  1 unpaired electron
B)  2 unpaired electrons
C)  3 unpaired electrons
D)  5 unpaired electrons
E)  No unpaired electronsF) B) and E)
G) A) and E)

Question 18

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) B) and D)

Question 19

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 20

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) A) and E)

Exam 20: The Chemistry of Coordination Compounds

In the complex ion [Fe(CN) 6]4-, the oxidation number of Fe is

Correct AnswerverifiedB

The correct formula for the dichlorobis(ethylenediamine) chromium(III) ion is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In the following pair of complex ions, choose the one that absorbs light at a longer wavelength.

Correct AnswerverifiedShow Answer

How many geometric isomers are possible for the complex [CrF3Br3]3-? Draw these isomers.

Correct AnswerverifiedTwo geometric isomer...View AnswerShow Answer

A molecule or atom that accepts an electron pair to form a coordinate covalent bond is called a Lewis _______.

Correct AnswerverifiedShow Answer

In the following pair of complex ions, choose the one that absorbs light at a shorter wavelength.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The electron configuration of an Fe2+ ion is

Correct AnswerverifiedShow Answer

The correct formula for the dibromobis(oxalato)cobaltate(III)ion is [Co(C2O4)Br2]3+.

Correct AnswerverifiedShow Answer

Give (a)the oxidation number of the metal, (b)the number of d electrons, (c)the coordination number, (d)the charge of the complex ion, and (e)the number and type of ligands for the coordination compound shown below.

Correct Answerverified(a)+3, (b)3 d electr...View AnswerShow Answer

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

Correct AnswerverifiedFalse

How would you expect the molecule 1,10-phenanthroline (shown below) to function as a ligand?

Correct AnswerverifiedShow Answer

Labile complexes are coordination complexes that

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

In the complex ion [Cr(C2O4) 2(H2O) 2]-, the oxidation number of Cr is

Correct AnswerverifiedC

How many unpaired electrons does the manganese ion have in [Mn(CN) 6]4- ?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

In the complex ion [Fe(CN) ₆]^4-, the oxidation number of Fe is

Correct Answer
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B

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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

Correct Answer
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How many geometric isomers are possible for the complex [CrF₃Br₃]^3-? Draw these isomers.

Correct Answer
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Two geometric isomer...
View Answer

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

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The electron configuration of an Fe²⁺ ion is

Correct Answer
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The correct formula for the dibromobis(oxalato)cobaltate(III)ion is [Co(C₂O₄)Br₂]³⁺.

Correct Answer
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Correct Answer
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(a)+3, (b)3 d electr...
View Answer

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

Correct Answer
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False

Correct Answer
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Correct Answer
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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?

Correct Answer
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In the complex ion [Cr(C₂O₄) ₂(H₂O) ₂]^-, the oxidation number of Cr is

Correct Answer
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C

How many unpaired electrons does the manganese ion have in [Mn(CN) ₆]^4- ?

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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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