Question 1

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

Question 2

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. 
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.

Question 3

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. 
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.

Question 4

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. 
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.

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)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. 
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.

Question 6

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

Accepted Answer

A) 2 
B) 4 
C) 3 
D) 10 
E) 5 
A) 2 
B) 4 
C) 3 
D) 10 
E) 5

Question 7

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. 
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.

Question 8

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.= +3 
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.= +3

Question 9

Which of the following is a bidentate ligand?

Accepted Answer

A) cyanide ion 
B) nitrite ion 
C) ammonia 
D) thiocyanate ion 
E) ethylenediamine 
A) cyanide ion 
B) nitrite ion 
C) ammonia 
D) thiocyanate ion 
E) ethylenediamine

Question 10

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

Question 11

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) 
A) hexabromomanganate(II) 
B) hexacyanoferrate(II) 
C) hexacyanoferrate(III) 
D) hexabromomanganate(IV) 
E) hexachlorochromate(II)

Question 12

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) Complexation 
A) Exchange number 
B) Coordination kinetics 
C) Reaction rate 
D) Kinetic lability 
E) Complexation

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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

Question 15

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

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

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

Question 18

Coordination compounds may exhibit ___________ and __________ types of stereoisomerism.

Accepted Answer

geometrica

Question 19

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) 9 
A) 1 
B) 3 
C) 5 
D) 7 
E) 9

Question 20

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

Accepted Answer

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

Exam 22: Coordination Chemistry

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

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)

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?

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?

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?

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

Cisplatin complexes are

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]+?

Which of the following is a bidentate ligand?

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

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

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?

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

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

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

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

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

Coordination compounds may exhibit ___________ and __________ types of stereoisomerism.

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

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

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

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)

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?

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

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]⁺?

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

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

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

Coordination compounds may exhibit _ and types of stereoisomerism.

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