Question 1

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 2

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) C) and D)
G) A) and E)

Question 3

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) All of the above
G) A) and B)

Question 4

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 5

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) D) and E)

Question 6

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 7

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

Accepted Answer

Question 8

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

Accepted Answer

Two geometric isomer...

Question 9

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) A) and B)
G) A) and C) C

Question 10

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) C) and D)

Question 11

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 C)
G) All of the above

Question 12

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) B) and E)
G) D) and E) B

Question 13

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

Accepted Answer

A) True 
 B)False  False

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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 16

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

Accepted Answer

A)  A
B)  B
C)  C
D)  DE) None of the above
F) A) and D)

Question 17

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) D) and E)
G) B) and E)

Question 18

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 19

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) A) and C)
G) D) and E)

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) None of the above
G) C) and E)

Exam 20: The Chemistry of Coordination Compounds

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

Correct AnswerverifiedShow Answer

The electron configuration of an Fe2+ ion is

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

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

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

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedTwo geometric isomer...View AnswerShow Answer

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

Correct AnswerverifiedC

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

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

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

Correct AnswerverifiedB

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

Correct AnswerverifiedFalse

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

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

Labile complexes are coordination complexes that

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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

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

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

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The electron configuration of an Fe²⁺ ion is

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

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

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Two geometric isomer...
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In the complex ion [Cr(C₂O₄) ₂(H₂O) ₂]^-, the oxidation number of Cr is

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C

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

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

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B

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

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False

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

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