Question 1

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)  5F) B) and C)
G) A) and B)

Question 2

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

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

Question 3

What is the coordination number of cobalt in the complex ion [Co(en) Cl4]-? (en = ethylenediamine)

Accepted Answer

A)  1
B)  2
C)  4
D)  6
E)  8F) A) and C)
G) B) and C)

Question 4

What is the formula for pentaamminechlorocobalt(III) chloride?

Accepted Answer

A)  [Co(NH3) 5Cl]Cl
B)  [Co(NH3) 5Cl]Cl2
C)  [Co(NH3) 5Cl]Cl3
D)  [Co(NH3) 5Cl]Cl4
E)  [CoCl3](NH3) 5F) None of the above
G) B) and D)

Question 5

A bidentate ligand always

Accepted Answer

A)  forms bonds to two metal ions.
B)  has a charge of 2+ or 2-.
C)  forms complex ions with a charge of 2+ or 2-.
D)  has two donor atoms.
E)  has medical uses.F) A) and B)
G) A) and C)

Question 6

In the compound K[Co(C2O4) 2(H2O) 2] (where C2O42- = oxalate) the oxidation number and coordination number of cobalt are _____ and _____,respectively.

Accepted Answer

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

Question 7

Which one of these species is a bidentate ligand?

Accepted Answer

A)  CN-
B)  NH3
C)  CO
D)  H2NCH2CH2NH2
E)  EDTAF) A) and D)
G) A) and C)

Question 8

Which of the following ligands has two different types of donor atoms?

Accepted Answer

A)  NH3
B)  H2O
C)  NH4+
D)  NO2-
E)  ethylenediamineF) D) and E)
G) C) and D)

Question 9

Which of the following will be diamagnetic?

Accepted Answer

A)  Ni2+
B)  Cr2+
C)  Mn2+
D)  Co3+
E)  Ti4+F) B) and D)
G) A) and B)

Question 10

Why is the +2 oxidation state so common among transition elements?

Accepted Answer

The outermost electr...

Question 11

In a reaction between a metal ion and a group of anions or a polar molecule,the anions or polar molecule acts as a _______ ________.

Accepted Answer

The answer of In a reaction between a metal ion...

Question 12

How many 3d electrons does a ground-state Pd2+ ion have?

Accepted Answer

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

Question 13

What is the electron configuration of a ground-state Nb2+ ion?

Accepted Answer

A)  1s22s22p63s23p64s23d104p65s24d1
B)  1s22s22p63s23p64s23d104p64d3
C)  1s22s22p63s23p64s23d104p65s14d2
D)  1s22s22p63s23p64s23d104p64d5
E)  1s22s22p63s23p64s23d104p65s24d3F) B) and E)
G) A) and B)

Question 14

Which are the most common transition metals?

Accepted Answer

A)  The transition metals in the 3rd period.
B)  The transition metals in the 4th period.
C)  The elements in Group 6B.
D)  The transition metals in the 5th period.
E)  The transition metals in the 6th period.F) B) and D)
G) All of the above

Question 15

Which of these diagrams represent the crystal field splitting between d orbitals in an octahedral complex?

Accepted Answer

A)   
B)   
C)   
D)   E) C) and D)
F) All of the above

Question 16

The following energy-level diagram could correspond to which coordination compound?

Accepted Answer

A)  hexabromomanganate(II) 
B)  hexacyanoferrate(II) 
C)  hexacyanoferrate(III) 
D)  hexabromomanganate(IV) 
E)  hexachlorochromate(II) F) A) and D)
G) All of the above

Question 17

Ethylenediaminetetraacetic acid (EDTA)is an effective antidote for heavy metal poisoning (e.g.,Pb2+ and Hg2+).

Accepted Answer

A) True 
 B)False

Question 18

The compound Rh(CO) (H) (PH3)2 forms cis and trans isomers.Use this information to predict the geometry of this complex isomer.

Accepted Answer

The complex has four ligands a...

Question 19

What is the name of the molecules or ions that surround the metal in a complex ion?

Accepted Answer

A)  Chelaters
B)  Donors
C)  Acceptors
D)  Coordinators
E)  LigandsF) None of the above
G) C) and D)

Question 20

What type of structure is exhibited by most of the transition metals?

Accepted Answer

A)  Close-packed
B)  Tetrahedral
C)  Trigonal planar
D)  Trigonal pyramidal
E)  None of the answers is correct.F) D) and E)
G) A) and D)

Exam 22: Coordination Chemistry

A bidentate ligand always

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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,respectively,

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

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Which of the following will be diamagnetic?

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In the compound K[Co(C2O4) 2(H2O) 2] (where C2O42- = oxalate) the oxidation number and coordination number of cobalt are _____ and _____,respectively.

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Which of the following ligands has two different types of donor atoms?

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What is the coordination number of cobalt in the complex ion [Co(en) Cl4]-? (en = ethylenediamine)

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Why is the +2 oxidation state so common among transition elements?

Correct AnswerverifiedThe outermost electr...View AnswerShow Answer

What is the name of the molecules or ions that surround the metal in a complex ion?

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Which of these diagrams represent the crystal field splitting between d orbitals in an octahedral complex?

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Ethylenediaminetetraacetic acid (EDTA)is an effective antidote for heavy metal poisoning (e.g.,Pb2+ and Hg2+).

Correct AnswerverifiedShow Answer

The following energy-level diagram could correspond to which coordination compound?

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Which one of these species is a bidentate ligand?

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What is the formula for pentaamminechlorocobalt(III) chloride?

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Which are the most common transition metals?

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The compound Rh(CO) (H) (PH3)2 forms cis and trans isomers.Use this information to predict the geometry of this complex isomer.

Correct AnswerverifiedThe complex has four ligands a...View AnswerShow Answer

What is the electron configuration of a ground-state Nb2+ ion?

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In a reaction between a metal ion and a group of anions or a polar molecule,the anions or polar molecule acts as a _______ ________.

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How many 3d electrons does a ground-state Pd2+ ion have?

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What type of structure is exhibited by most of the transition metals?

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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,respectively,

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

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In the compound K[Co(C₂O₄) ₂(H₂O) ₂] (where C₂O₄^2- = oxalate) the oxidation number and coordination number of cobalt are _ and _,respectively.

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What is the coordination number of cobalt in the complex ion [Co(en) Cl₄]^-? (en = ethylenediamine)

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The outermost electr...
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Correct Answer
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Ethylenediaminetetraacetic acid (EDTA)is an effective antidote for heavy metal poisoning (e.g.,Pb²⁺ and Hg²⁺).

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The compound Rh(CO) (H) (PH₃)₂ forms cis and trans isomers.Use this information to predict the geometry of this complex isomer.

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The complex has four ligands a...
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What is the electron configuration of a ground-state Nb²⁺ ion?

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In a reaction between a metal ion and a group of anions or a polar molecule,the anions or polar molecule acts as a _ __.

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How many 3d electrons does a ground-state Pd²⁺ ion have?

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Correct Answer
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