Question 1

Which of the following ions could exist in only the high-spin state in an octahedral complex?

Accepted Answer

A)  Cr2+ 
B)  Mn4+ 
C)  Fe3+ 
D)  Co3+ 
E)  Ni2+ 
A)  Cr2+ 
B)  Mn4+ 
C)  Fe3+ 
D)  Co3+ 
E)  Ni2+

Question 2

The systematic name of the coordination compound K2[Co(H2O)2I4] is potassium diaquotetraiodocobaltate(II).

Accepted Answer

A) True 
 B)False

Question 3

In complexes of transition metals, the maximum coordination number of the metal is equal to its number of d electrons.

Accepted Answer

A) True 
 B)False

Question 4

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y.   Which, if any, of the following pairs are optical isomers?

Accepted Answer

A)  Structures 1 and 2 
B)  Structures 1 and 3 
C)  Structures 1 and 4 
D)  Structures 3 and 4 
E)  Structures 1, 2, 3, and 4 
A)  Structures 1 and 2 
B)  Structures 1 and 3 
C)  Structures 1 and 4 
D)  Structures 3 and 4 
E)  Structures 1, 2, 3, and 4

Question 5

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 6

How many 4d electrons does a ground-state Ag+ ion have?

Accepted Answer

A)  8 
B)  1 
C)  10 
D)  2 
E)  9 
A)  8 
B)  1 
C)  10 
D)  2 
E)  9

Question 7

The net rotation of plane-polarized light by a racemic mixture is ________.

Accepted Answer

A)  to the right 
B)  to the left 
C)  zero 
A)  to the right 
B)  to the left 
C)  zero

Question 8

The atom in a ligand that is bound directly to the metal atom is known as the ________ ________.

Accepted Answer

The answer of The atom in a ligand that is...

Question 9

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

Question 10

Which of the following octahedral complexes should have the largest crystal field splitting energy, Δ?

Accepted Answer

A)  [Cr(H2O)6]3+ 
B)  [Cr(SCN)6]3 
C)  [Cr(NH3)6]3+ 
D)  [Cr(CN)6]3- 
E)  [Cr(en)3]3+ (en = ethylenediamine) 
A)  [Cr(H2O)6]3+ 
B)  [Cr(SCN)6]3 
C)  [Cr(NH3)6]3+ 
D)  [Cr(CN)6]3- 
E)  [Cr(en)3]3+ (en = ethylenediamine)

Question 11

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 12

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 13

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

Accepted Answer

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

Question 14

In the coordination compound [Cr(NH3)2(en)Cl2]Br2, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom, respectively, are

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. = 5; O.N. = +4. 
E)  C.N. = 4; O.N. = +3. 
A)  C.N. = 6; O.N. = +4. 
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.

Question 15

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)  5 
A)  0 
B)  1 
C)  2 
D)  3 
E)  5

Question 16

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. 
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.

Question 17

What name is given to the species that has the ability to hold the metal atom, in the complex ion, like a claw?

Accepted Answer

A)  Claw complex 
B)  Grasp agent 
C)  Chelating agent 
D)  Clutch ligand 
E)  Clasp a ligand 
A)  Claw complex 
B)  Grasp agent 
C)  Chelating agent 
D)  Clutch ligand 
E)  Clasp a ligand

Question 18

In the complex ion [Co(en)2Br2]+, what is the oxidation number of Co?

Accepted Answer

A)  +1 
B)  +2 
C)  +3 
D)  -2 
E)  -1 
A)  +1 
B)  +2 
C)  +3 
D)  -2 
E)  -1

Question 19

What is the oxidation number of Fe in [Fe(CN)6]4-?

Accepted Answer

Question 20

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.

Exam 22: Coordination Chemistry

Which of the following ions could exist in only the high-spin state in an octahedral complex?

The systematic name of the coordination compound K2[Co(H2O)2I4] is potassium diaquotetraiodocobaltate(II).

In complexes of transition metals, the maximum coordination number of the metal is equal to its number of d electrons.

Consider the following octahedral complex structures, each involving ethylene diamine and two different, unidentate ligands X and Y. Which, if any, of the following pairs are optical isomers?

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

How many 4d electrons does a ground-state Ag+ ion have?

The net rotation of plane-polarized light by a racemic mixture is ________.

The atom in a ligand that is bound directly to the metal atom is known as the ________ ________.

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

Which of the following octahedral complexes should have the largest crystal field splitting energy, Δ?

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

Which of the following is a bidentate ligand?

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

In the coordination compound [Cr(NH3)2(en)Cl2]Br2, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom, respectively, are

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

A bidentate ligand always

What name is given to the species that has the ability to hold the metal atom, in the complex ion, like a claw?

In the complex ion [Co(en)2Br2]+, what is the oxidation number of Co?

What is the oxidation number of Fe in [Fe(CN)6]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?

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Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

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Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

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Nonmetallic Elements and Their Compounds

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Filters

The systematic name of the coordination compound K₂[Co(H₂O)₂I₄] is potassium diaquotetraiodocobaltate(II).

How many 4d electrons does a ground-state Ag⁺ ion have?

The atom in a ligand that is bound directly to the metal atom is known as the .

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

In the coordination compound [Cr(NH₃)₂(en)Cl₂]Br₂, the coordination number (C.N.) and oxidation number (O.N.) of the metal atom, respectively, are

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

In the complex ion [Co(en)₂Br₂]⁺, what is the oxidation number of Co?

What is the oxidation number of Fe in [Fe(CN)₆]^4-?