Question 1

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

Accepted Answer

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

Question 2

Two complex ions containing Ni are [Ni(NH3) 6]2+, which is blue, 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(NH3) 6]2+ than for [Ni(en) 3]2+.
B)  [Ni(en) 3]2+ absorbs light in the violet region of the spectrum.
C)  Both complex ions are diamagnetic.
D)  The energy of the photon absorbed by [Ni(en) 3]2+ is greater than that absorbed by [Ni(NH3) 6]2+.
E)  The wavelength of the light absorbed by [Ni(en) 3]2+ is greater than the wavelength absorbed by [Ni(NH3) 6]2+. F) B) and E)
G) A) and B)

Question 3

Which of the following choices can function as a bidentate ligand?

Accepted Answer

A)  PH3
B)  Cl-
C)  CN-
D)  (-OCH2CH2CH2O-) 
E)  COF) D) and E)
G) A) and B)

Question 4

In the coordination compound [Cr(NH3) (en) 2Cl]Br2, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom are, respectively,

Accepted Answer

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

Question 5

What is the coordination number of cobalt in [Co(NH3)6]Cl3?

Accepted Answer

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

Question 7

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

Question 8

The best name for the complex shown below is

Accepted Answer

A)  cobalt(III) bis(ethylenediamine) bromide.
B)  dibromobis(ethylenediamine) cobalt(III) bromide.
C)  dibromidedi(ethylenediamine) cobalt(III) bromide.
D)  dibromodiethylenediaaminecobalt(III) bromide.
E)  tribromobis(ethylenediamine) cobalt(III) .F) C) and D)
G) A) and E)

Question 9

Ethylenediaminetetraacetic acid (EDTA) is

Accepted Answer

A)  not useful as a chelating agent.
B)  an effective antidote for heavy metal poisoning (e.g., Pb2+ and Hg2+) .
C)  a monodentate ligand.
D)  known to form unstable complex ions with Fe3+, Hg2+, and Zn2+.
E)  known to form complexes with platinum that inhibit the growth of cancerous cells.F) A) and B)
G) A) and E)

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) C) and D)
F) B) and C)

Question 11

The correct formula for pentaamminechloroplatinum(IV) chloride is:

Accepted Answer

A)  [Pt(NH3) 5Cl]Cl3
B)  [Pt(NH3) 5Cl]Cl2
C)  [Pt(NH3) 5]Cl3
D)  [Pt(NH3) 5Cl]Cl4
E)  [Pt(NH3) 5]Cl4F) C) and D)
G) A) and D)

Question 12

In K4[Fe(CN) 6], how many 3d electrons does the iron atom have?

Accepted Answer

A)  3
B)  4
C)  5
D)  6
E)  7F) C) and E)
G) B) and D)

Question 13

Which one of these complex ions would absorb light with the shortest wavelength?

Accepted Answer

A)  [Co(H2O) 6]2+
B)  [Co(NH3) 6]2+
C)  [CoF6]4-
D)  [Co(CN) 6]4-
E)  [Co(en) 6]2+F) A) and D)
G) C) and E)

Question 14

Which of these square planar complex ions can have cis-trans isomers?

Accepted Answer

A)  [Pt(NH3) 4]2+
B)  [Ni(NH3) 4]2+
C)  [Pt(NH3) 2Cl2]
D)  [Pt(NH3) Cl3]-
E)  [Ni(NH3) 3Cl]+F) A) and E)
G) A) and C)

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

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

Question 17

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) B) and E)

Question 18

What is the oxidation number of Co in the complex [Co(H2O)4Cl2]Cl?

Accepted Answer

Question 19

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) All of the above

Question 20

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) A) and B)
G) B) and D)

Exam 23: Transition Metal Chemistry and Coordination Compounds

Which of these square planar complex ions can have cis-trans isomers?

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The electron configuration of an Fe2+ ion is

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The best name for the complex shown below is

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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

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Which one of these complex ions would absorb light with the shortest wavelength?

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In the coordination compound [Cr(NH3) (en) 2Cl]Br2, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom are, respectively,

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Two complex ions containing Ni are [Ni(NH3) 6]2+, which is blue, and [Ni(en) 3]2+, which is purple.Which one of these statements is true?

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Which of the following complexes has optical (chiral) isomers?

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Labile complexes are coordination complexes that

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

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

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In K4[Fe(CN) 6], how many 3d electrons does the iron atom have?

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What is the oxidation number of Co in the complex [Co(H2O)4Cl2]Cl?

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

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Which of the following choices can function as a bidentate ligand?

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What is the coordination number of cobalt in [Co(NH3)6]Cl3?

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Ethylenediaminetetraacetic acid (EDTA) is

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

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The correct formula for pentaamminechloroplatinum(IV) chloride is:

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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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The electron configuration of an Fe²⁺ ion is

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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

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In the coordination compound [Cr(NH₃) (en) ₂Cl]Br₂, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom are, respectively,

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Two complex ions containing Ni are [Ni(NH₃) ₆]²⁺, which is blue, and [Ni(en) ₃]²⁺, which is purple.Which one of these statements is true?

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

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In K₄[Fe(CN) ₆], how many 3d electrons does the iron atom have?

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What is the oxidation number of Co in the complex [Co(H₂O)₄Cl₂]Cl?

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

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What is the coordination number of cobalt in [Co(NH₃)₆]Cl₃?

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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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