Question 1

Dioxygenases are enzymes in which one atom of O2 is inserted into an organic molecule and the other is reduced to water.

Accepted Answer

A) True 
 B)False  False

Question 2

Which of the following metals has the largest atomic radius?

Accepted Answer

A)  Y 
B)  Tc 
C)  Ru 
D)  Rh 
E)  Zr 
A)  Y 
B)  Tc 
C)  Ru 
D)  Rh 
E)  Zr A

Question 3

What are iron-sulfur proteins? How do they transfer electrons?

Accepted Answer

All known bacteria, plants, and animals use iron-sulfur proteins to transfer electrons. Iron-sulfur proteins transfer electrons over a wide range of reduction potentials, and their iron content can range from 1 to more than 12 Fe atoms per protein molecule. In addition, most iron-sulfur proteins contain stoichiometric amounts of sulfide (S²⁻). These properties are due to the presence of four different kinds of iron-sulfur units, which contain one, two, three, or four iron atoms per Fe-S complex. In all cases, the Fe²⁺ and Fe³⁺ ions are coordinated to four sulfur ligands in a tetrahedral environment. Due to tetrahedral coordination by weak-field sulfur ligands, the iron is high spin in both the Fe³⁺ and Fe²⁺ oxidation states, which results in similar structures for the oxidized and reduced forms of the Fe-S complexes. Consequently, only small structural changes occur after oxidation or reduction of the Fe-S center, which results in rapid electron transfer.

Question 4

The maximum oxidation state of Molybdenum is _____.

Accepted Answer

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

Question 5

A(n) _____ is a highly reactive organic species that contains one or more unpaired electrons and produces undesirable reactions.

Accepted Answer

The answer of A(n) _____ is a highly reactive organic...

Question 6

The group 5 metals are normally found in nature as _____.

Accepted Answer

The answer of The group 5 metals are normally found...

Question 7

An isomer in which three ligands occupy opposite triangular faces of an octahedron is called a _____ isomer.

Accepted Answer

A)  mer 
B)  optical 
C)  cis 
D)  fac 
E)  trans 
A)  mer 
B)  optical 
C)  cis 
D)  fac 
E)  trans

Question 8

An ion or a molecule that contains one or more pair of electrons that can be shared with the central metal in a metal complex is called a(n) _____.

Accepted Answer

A)  isomer 
B)  radical 
C)  ligand 
D)  adduct 
E)  coordination compound 
A)  isomer 
B)  radical 
C)  ligand 
D)  adduct 
E)  coordination compound

Question 9

Which of the following is most likely to form stable compounds in +4 oxidation state?

Accepted Answer

A)  La 
B)  Ac 
C)  Zr 
D)  Nb 
E)  Fe 
A)  La 
B)  Ac 
C)  Zr 
D)  Nb 
E)  Fe

Question 10

A _____ isomer is a type of isomer in which the ligands or the substituents are adjacent to one another in a rigid molecule or a metal complex.

Accepted Answer

A)  cis 
B)  trans 
C)  structural 
D)  fac 
E)  mer 
A)  cis 
B)  trans 
C)  structural 
D)  fac 
E)  mer

Question 11

Which of the following proteins does not contain a metal-porphyrin complex?

Accepted Answer

A)  Hemoglobin 
B)  Cytochromes 
C)  Myoglobin 
D)  Hemocyanin 
E)  Cytoglobin 
A)  Hemoglobin 
B)  Cytochromes 
C)  Myoglobin 
D)  Hemocyanin 
E)  Cytoglobin

Question 12

The transition metals become more reactive from left to right across a row.

Accepted Answer

A) True 
 B)False

Question 13

Only one arrangement of d electrons is possible for metal ions with d7 configuration.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following elements has the highest electrical conductivity?

Accepted Answer

A)  Sc 
B)  Au 
C)  Re 
D)  Nb 
E)  Cr 
A)  Sc 
B)  Au 
C)  Re 
D)  Nb 
E)  Cr

Question 15

The function of electron-transfer proteins is to catalyze a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 16

A(n) _____ is a chemical compound composed of a central metal atom or ion bonded to one or more ligands.

Accepted Answer

The answer of A(n) _____ is a chemical compound composed...

Question 17

Most transition metals are found in nature as free metals.

Accepted Answer

A) True 
 B)False

Question 18

State the Jahn-Teller theorem.

Accepted Answer

The Jahn-Teller theorem states that non-

Question 19

The transition metals Nb, Tc, and Mo, when arranged in the increasing order of their electrical conductivities follow the order:

Accepted Answer

A)  Nb < Tc < Mo. 
B)  Nb < Mo < Tc. 
C)  Mo < Tc < Nb. 
D)  Tc < Mo < Nb. 
E)  Mo < Nb < Tc. 
A)  Nb < Tc < Mo. 
B)  Nb < Mo < Tc. 
C)  Mo < Tc < Nb. 
D)  Tc < Mo < Nb. 
E)  Mo < Nb < Tc.

Question 20

The valence electron configuration of lanthanum is _____.

Accepted Answer

A)  5s24d1 
B)  6s25d1 
C)  7s26d1 
D)  5s24d2 
E)  6s25d2 
A)  5s24d1 
B)  6s25d1 
C)  7s26d1 
D)  5s24d2 
E)  6s25d2

Exam 23: The D-Block Elements

Dioxygenases are enzymes in which one atom of O2 is inserted into an organic molecule and the other is reduced to water.

Which of the following metals has the largest atomic radius?

What are iron-sulfur proteins? How do they transfer electrons?

The maximum oxidation state of Molybdenum is _____.

A(n) _____ is a highly reactive organic species that contains one or more unpaired electrons and produces undesirable reactions.

The group 5 metals are normally found in nature as _____.

An isomer in which three ligands occupy opposite triangular faces of an octahedron is called a _____ isomer.

An ion or a molecule that contains one or more pair of electrons that can be shared with the central metal in a metal complex is called a(n) _____.

Which of the following is most likely to form stable compounds in +4 oxidation state?

A _____ isomer is a type of isomer in which the ligands or the substituents are adjacent to one another in a rigid molecule or a metal complex.

Which of the following proteins does not contain a metal-porphyrin complex?

The transition metals become more reactive from left to right across a row.

Only one arrangement of d electrons is possible for metal ions with d7 configuration.

Which of the following elements has the highest electrical conductivity?

The function of electron-transfer proteins is to catalyze a chemical reaction.

A(n) _____ is a chemical compound composed of a central metal atom or ion bonded to one or more ligands.

Most transition metals are found in nature as free metals.

State the Jahn-Teller theorem.

The transition metals Nb, Tc, and Mo, when arranged in the increasing order of their electrical conductivities follow the order:

The valence electron configuration of lanthanum is _____.

Introduction to Chemistry

Molecules, Ions, and Chemical Formulas

Chemical Reactions

Reactions in Aqueous Solution

Energy Changes in Chemical Reactions

The Structure of Atoms

The Periodic Table and Periodic Trends

Ionic Versus Covalent Bonding

Molecular Geometry and Covalent Bonding Models

Gases

Liquids

Solids

Solutions

Chemical Kinetics

Chemical Equilibrium

Aqueous Acidbase Equilibriums

Solubility and Complexation Equilibriums

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Periodic Trends and the S-Block Elements

The P-Block Elements

Organic Compounds

Filters

Dioxygenases are enzymes in which one atom of O₂ is inserted into an organic molecule and the other is reduced to water.

Only one arrangement of d electrons is possible for metal ions with d⁷ configuration.