Question 1

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

Accepted Answer

The outermost electr...

Question 2

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) All of the above

Question 3

Which of the following will be diamagnetic?

Accepted Answer

A)  Ni2+
B)  Cr2+
C)  Mn2+
D)  Co3+
E)  Ti4+F) D) and E)
G) All of the above

Question 4

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 5

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

Question 6

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

Question 7

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) C) and D)
G) All of the above

Question 8

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) B) and C)

Question 9

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) B) and C)

Question 10

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

Question 11

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

Accepted Answer

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

Question 12

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) A) and D)
G) None of the above

Question 13

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) B) and E)

Question 14

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

Question 15

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

Accepted Answer

A)  1s22s22p63s23p64s23d104p65s24d1
B)  1s22s22p63s23p64s23d104p64d3
C)  1s22s22p63s23p64s23d104p65s14d2
D)  1s22s22p63s23p64s23d104p64d5
E)  1s22s22p63s23p64s23d104p65s24d3F) A) and D)
G) None 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 E)
G) None 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

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

Accepted Answer

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

Question 19

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 20

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 D)
G) A) and C)

Exam 22: Coordination Chemistry

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

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

Correct AnswerverifiedThe outermost electr...View AnswerShow Answer

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

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

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Which of the following will be diamagnetic?

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

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

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

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Which one of these species is a bidentate ligand?

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A bidentate ligand always

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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 are the most common transition metals?

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What is the formula for pentaamminechlorocobalt(III) chloride?

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

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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

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

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

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

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

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

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

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

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