Question 1

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

Accepted Answer

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

Question 2

Iron(III) forms an octahedral complex with the ligand CN-.How many unpaired electrons are in the d orbitals of iron?

Accepted Answer

A)  1
B)  3
C)  5
D)  7
E)  9F) A) and B)
G) A) and C)

Question 3

Consider the following structures (1 and 2 are octahedral; 3 and 4 are square planar) .  Which one of the following statements about the above structures is correct?

Accepted Answer

A)  Structures 1 and 2 are superimposable.
B)  Structures 1 and 2 are geometric isomers.
C)  Structures 3 and 4 are structural isomers.
D)  Structures 3 and 4 are optical isomers.
E)  Structures 3 and 4 are geometric isomers.F) D) and E)
G) A) and C)

Question 4

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 C)
G) A) and D)

Question 5

The maximum oxidation state of an element in the first transition series never exceeds its group number.

Accepted Answer

A) True 
 B)False

Question 6

Consider the following octahedral complex structures,each involving ethylene diamine and two different,unidentate ligands X and Y.  Which one of the following statements about these structures is incorrect?

Accepted Answer

A)  Structures 1 and 2 are optical isomers.
B)  Structures 1 and 3 are optical isomers.
C)  Structures 1 and 3 are different complexes.
D)  Structures 1 and 4 are geometrical isomers.
E)  Structures 3 and 4 are the same complex.F) A) and C)
G) A) and E)

Question 7

What is the systematic name for [CoCl3(H2O) ]-?

Accepted Answer

A)  cobalt(III) chloride monohydrate
B)  aquatrichlorocobalt(II) 
C)  aquatrichlorocobaltate(II) 
D)  aquatrichlorocobaltite(I) 
E)  monoaquotris(chloro) cobalt(IV) F) B) and D)
G) B) and E)

Question 8

What is the name that refers to the number of donor atoms surrounding the central metal atom in a complex ion?

Accepted Answer

A)  Donor number
B)  Coordination number
C)  Metal number
D)  Metal-donor ratio
E)  Acceptor numberF) C) and D)
G) B) and D)

Question 9

Coordination compounds may exhibit ___________ and __________ types of stereoisomerism.

Accepted Answer

geometrica...

Question 10

Which is the appropriate energy-level diagram for the octahedral coordination complex hexaammineiron(III) ?

Accepted Answer

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

Question 11

How should the color of the solution change as [Fe(CN) 6]4- undergoes the following chemical change? [Fe(H2O) 6]2+(aq) + 6CN-(aq) → [Fe(CN) 6]4-(aq) + 6H2O(l)

Accepted Answer

A)  The solution should change from yellow to blue.
B)  The solution should change from blue to yellow.
C)  The solution should not change color.
D)  The solution should become colorless because H2O is a colorless liquid.
E)  It is impossible to tell without performing a measurement.F) C) and E)
G) C) and D)

Question 12

Cisplatin complexes are

Accepted Answer

A)  used in the extraction of silver and gold.
B)  effective antidotes for heavy metal poisoning (e.g.,Pb2+ and Hg2+) .
C)  used to provide nutrients for plants.
D)  used to prevent eutrophication of lakes.
E)  effective antitumor agents.F) B) and C)
G) A) and C)

Question 13

Which of the following ions is most likely to form colored compounds?

Accepted Answer

A)  Sc3+
B)  Cu+
C)  Zn2+
D)  Cr3+
E)  Ca2+F) C) and D)
G) A) and D)

Question 14

Which response gives the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH3) 2(H2O) 2Cl2]+?

Accepted Answer

A)  C.N.= 2; O.N.= +3
B)  C.N.= 3; O.N.= +1
C)  C.N.= 4; O.N.= +2
D)  C.N.= 6; O.N.= +1
E)  C.N.= 6; O.N.= +3F) C) and D)
G) A) and B)

Question 15

In the coordination compound [Pt(NH3) 2Cl2],the coordination number and oxidation number of the central atom are _____ and _____,respectively.

Accepted Answer

A)  2; 0
B)  4; +4
C)  5; 0
D)  4; +2
E)  6; +2F) B) and D)
G) B) and E)

Question 16

How many 3d electrons does a ground-state Nb3+ ion have?

Accepted Answer

A)  2
B)  4
C)  3
D)  10
E)  5F) B) and C)
G) A) and E)

Question 17

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

Accepted Answer

A) True 
 B)False

Question 18

The method of distinguishing between the stability of a complex ion and its tendency to react in an exchange reaction is known as which of the following?

Accepted Answer

A)  Exchange number
B)  Coordination kinetics
C)  Reaction rate
D)  Kinetic lability
E)  ComplexationF) All of the above
G) A) and E)

Question 19

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

Question 20

Which of the following is a bidentate ligand?

Accepted Answer

A)  cyanide ion
B)  nitrite ion
C)  ammonia
D)  thiocyanate ion
E)  ethylenediamineF) All of the above
G) A) and B)

Exam 22: Coordination Chemistry

Which of the following is a bidentate ligand?

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In the coordination compound [Pt(NH3) 2Cl2],the coordination number and oxidation number of the central atom are _____ and _____,respectively.

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

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Iron(III) forms an octahedral complex with the ligand CN-.How many unpaired electrons are in the d orbitals of iron?

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Cisplatin complexes are

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Coordination compounds may exhibit ___________ and __________ types of stereoisomerism.

Correct Answerverifiedgeometrica...View AnswerShow Answer

Consider the following structures (1 and 2 are octahedral; 3 and 4 are square planar) . Which one of the following statements about the above structures is correct?

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Which response gives the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH3) 2(H2O) 2Cl2]+?

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What is the name that refers to the number of donor atoms surrounding the central metal atom in a complex ion?

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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?

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How many 3d electrons does a ground-state Nb3+ ion have?

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The method of distinguishing between the stability of a complex ion and its tendency to react in an exchange reaction is known as which of the following?

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

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How should the color of the solution change as [Fe(CN) 6]4- undergoes the following chemical change? [Fe(H2O) 6]2+(aq) + 6CN-(aq) → [Fe(CN) 6]4-(aq) + 6H2O(l)

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Which of the following ions is most likely to form colored compounds?

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

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Which is the appropriate energy-level diagram for the octahedral coordination complex hexaammineiron(III) ?

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Consider the following octahedral complex structures,each involving ethylene diamine and two different,unidentate ligands X and Y. Which one of the following statements about these structures is incorrect?

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The maximum oxidation state of an element in the first transition series never exceeds its group number.

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What is the systematic name for [CoCl3(H2O) ]-?

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In the coordination compound [Pt(NH₃) ₂Cl₂],the coordination number and oxidation number of the central atom are _ and _,respectively.

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

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Iron(III) forms an octahedral complex with the ligand CN^-.How many unpaired electrons are in the d orbitals of iron?

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Coordination compounds may exhibit _ and types of stereoisomerism.

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geometrica...
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Which response gives the correct coordination number (C.N.) and oxidation number (O.N.) of the transition metal atom in [Co(NH₃) ₂(H₂O) ₂Cl₂]⁺?

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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?

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How many 3d electrons does a ground-state Nb³⁺ ion have?

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How should the color of the solution change as [Fe(CN) ₆]^4- undergoes the following chemical change? [Fe(H₂O) ₆]²⁺(aq) + 6CN^-(aq) → [Fe(CN) ₆]^4-(aq) + 6H₂O(l)

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

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What is the systematic name for [CoCl₃(H₂O) ]^-?

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