Question 1

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

Accepted Answer

A) Sc 3+ 
B) Ni 2+ 
C) Mn 2+ 
D) Ti 4+ 
E) Zn 2+ 
A) Sc 3+ 
B) Ni 2+ 
C) Mn 2+ 
D) Ti 4+ 
E) Zn 2+

Question 2

10.0 mL of a 0.100 mol/L solution of a metal ion M2+ is mixed with 10.0 mL of a 0.100 mol/L solution of a ligand L. A reaction occurs in which the product is ML3. Approximately, what is the maximum concentration of ML32+, in mol/L, which could result from this reaction?

Accepted Answer

A) 0.100 
B) 0.050 
C) 0.033 
D) 0.025 
E) 0.017 
A) 0.100 
B) 0.050 
C) 0.033 
D) 0.025 
E) 0.017

Question 3

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

Accepted Answer

A) 1 and 2 
B) 1 and 3 
C) 1 and 4 
D) 3 and 4 
E) None of these choices are correct. 
A) 1 and 2 
B) 1 and 3 
C) 1 and 4 
D) 3 and 4 
E) None of these choices are correct.

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Which of the following complexes could have isomeric forms?

Accepted Answer

A) [Pt(NH 3)3Cl] + 
B) [Fe(CN)6] 3 + 
C) [Pt(NH 3)Br 3] + 
D) [Pt(en)Cl 2] 
E) [Co(H 2O)4Cl 2] + 
A) [Pt(NH 3)3Cl] + 
B) [Fe(CN)6] 3 + 
C) [Pt(NH 3)Br 3] + 
D) [Pt(en)Cl 2] 
E) [Co(H 2O)4Cl 2] +

Question 6

A certain transition metal complex has the formula MX42+. If the metal ion has a d8 electron configuration, what is the shape of the complex?

Accepted Answer

A) Octahedral 
B) Square pyramid 
C) Tetrahedral 
D) Trigonal pyramid 
E) Square planar 
A) Octahedral 
B) Square pyramid 
C) Tetrahedral 
D) Trigonal pyramid 
E) Square planar

Question 7

The ground state electron configuration of a transition element atom cannot have more than one incomplete subshell.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following ligands could participate in linkage isomerism?

Accepted Answer

A) NH 3 
B) H 2O 
C) NH 4 + 
D) NO 2 − 
E) Ethylenediamine 
A) NH 3 
B) H 2O 
C) NH 4 + 
D) NO 2 − 
E) Ethylenediamine

Question 9

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) 8 
A) 1 
B) 2 
C) 4 
D) 6 
E) 8

Question 10

Of the 3d transition series of elements, zinc has the greatest atomic radius.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following ligands is most likely to form a high spin octahedral complex with cobalt(II)?

Accepted Answer

A) CN − 
B) en (ethylenediamine) 
C) NO 2 − 
D) CO 
E) I − 
A) CN − 
B) en (ethylenediamine) 
C) NO 2 − 
D) CO 
E) I −

Question 12

Which of the following coordination numbers applies to octahedral complexes?

Accepted Answer

A) 4 
B) 5 
C) 6 
D) 8 
E) None of these choices are correct. 
A) 4 
B) 5 
C) 6 
D) 8 
E) None of these choices are correct.

Question 13

In a coordination compound involving a complex ion of square planar geometry, which of the following types of isomerism is/are never possible?

Accepted Answer

A) Geometric 
B) Optical 
C) Linkage 
D) Coordination 
E) More than one of these 
A) Geometric 
B) Optical 
C) Linkage 
D) Coordination 
E) More than one of these

Question 14

A characteristic of ligands is that

Accepted Answer

A) they are Lewis acids. 
B) they are Lewis bases. 
C) they are ions. 
D) they are electron pair acceptors. 
E) they are Brønsted-Lowry acids. 
A) they are Lewis acids. 
B) they are Lewis bases. 
C) they are ions. 
D) they are electron pair acceptors. 
E) they are Brønsted-Lowry acids.

Question 15

Which of the following ligands is most likely to form a low-spin octahedral complex with iron(III)?

Accepted Answer

A) Cl − 
B) H 2O 
C) NH 3 
D) OH − 
E) CO 
A) Cl − 
B) H 2O 
C) NH 3 
D) OH − 
E) CO

Question 16

The Cu2+ ion has 1 unpaired electron.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following transition elements can have an oxidation number of +7?

Accepted Answer

A) V 
B) Cr 
C) Mn 
D) Fe 
E) Co 
A) V 
B) Cr 
C) Mn 
D) Fe 
E) Co

Question 18

The most common oxidation state for ions of the transition elements is

Accepted Answer

A) +2. 
B) +3. 
C) +4. 
D) +5. 
E) +6. 
A) +2. 
B) +3. 
C) +4. 
D) +5. 
E) +6.

Question 19

Which of the following transition elements can achieve the largest oxidation number?

Accepted Answer

A) Chromium, Cr, Group 6B(6) 
B) Manganese, Mn, Group 7B(7) 
C) Iron, Fe, Group 8B(8) 
D) Cobalt, Co, Group 8B(9) 
E) Zinc, Zn, Group 2B(12) 
A) Chromium, Cr, Group 6B(6) 
B) Manganese, Mn, Group 7B(7) 
C) Iron, Fe, Group 8B(8) 
D) Cobalt, Co, Group 8B(9) 
E) Zinc, Zn, Group 2B(12)

Question 20

In the spectrochemical series, which one of the following ligands has the strongest field?

Accepted Answer

A) H 2O 
B) CN − 
C) NH 3 
D) OH − 
E) Cl − 
A) H 2O 
B) CN − 
C) NH 3 
D) OH − 
E) Cl −

Exam 23: Transition Elements and Their Coordination Compounds

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

10.0 mL of a 0.100 mol/L solution of a metal ion M2+ is mixed with 10.0 mL of a 0.100 mol/L solution of a ligand L. A reaction occurs in which the product is ML3. Approximately, what is the maximum concentration of ML32+, in mol/L, which could result from this reaction?

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

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

Which of the following complexes could have isomeric forms?

A certain transition metal complex has the formula MX42+. If the metal ion has a d8 electron configuration, what is the shape of the complex?

The ground state electron configuration of a transition element atom cannot have more than one incomplete subshell.

Which of the following ligands could participate in linkage isomerism?

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

Of the 3d transition series of elements, zinc has the greatest atomic radius.

Which of the following ligands is most likely to form a high spin octahedral complex with cobalt(II)?

Which of the following coordination numbers applies to octahedral complexes?

In a coordination compound involving a complex ion of square planar geometry, which of the following types of isomerism is/are never possible?

A characteristic of ligands is that

Which of the following ligands is most likely to form a low-spin octahedral complex with iron(III)?

The Cu2+ ion has 1 unpaired electron.

Which of the following transition elements can have an oxidation number of +7?

The most common oxidation state for ions of the transition elements is

Which of the following transition elements can achieve the largest oxidation number?

In the spectrochemical series, which one of the following ligands has the strongest field?

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Nuclear Reactions and Their Applications

Filters

10.0 mL of a 0.100 mol/L solution of a metal ion M²⁺ is mixed with 10.0 mL of a 0.100 mol/L solution of a ligand L. A reaction occurs in which the product is ML₃. Approximately, what is the maximum concentration of ML₃²⁺, in mol/L, which could result from this reaction?

A certain transition metal complex has the formula MX₄²⁺. If the metal ion has a d⁸ electron configuration, what is the shape of the complex?

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

The Cu²⁺ ion has 1 unpaired electron.