Coordination compounds. Molecular orbital theory : tests

44 Pages·2018·0.43 MB·Russian

by  M. M. Petrova, E. M. Zueva, A. M. Kuznetsov

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The Ministry of Education and Science of the Russian Federation
Kazan National Research Technological University

COORDINATION COMPOUNDS.
MOLECULAR ORBITAL THEORY

Tests

Kazan
KNRTU Press
2018
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UDC 546; 54-386

The study guide is published in accordance with the decision
of the Faculty of Chemical Technologies

Reviewers:
Ph. D. (in chemistry), Full Prof. N. B. Berezin
Ph. D. (in chemistry), Full Prof. M. B. Gazizov

Contributors:
Assoc. Prof. М. М. Petrova
Full Prof. Е. М. Zueva
Full Prof. А. М. Kuznetsov

Coordination compounds. Molecular orbital theory : tests / сontributors :
M. M. Petrova, E. M. Zueva, A. M. Kuznetsov; The Ministry of Education
and Science of the Russian Federation, Kazan National Research
Technological University. – Kazan: KNRTU Press, 2018. – 44 p.

The study guide contains individual test tasks, which can be used to control
student achievements in the topic "Coordination compounds. Molecular orbital
theory".
The tasks are developed for the first-year students of engineering degree
programs, who study the discipline "General and Inorganic Chemistry" and "The
additional chapters of Inorganic Chemistry" in English.
The study guide was prepared at the Department of Inorganic Chemistry.

UDC 546; 54-386
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INDIVIDUAL TASKS

Variant 1

Task 1. Determine the electronic structure of the octahedral [Co(NH ) ]2+
3 6
complex within the framework of the molecular orbital (MO) theory.

1. The number of valence electrons in this complex is
А) 18 C) 20
B) 19 D) 21

2. Draw the MO-diagram of this complex (without accounting for the
π-bonding effect) and distribute valence electrons into atomic and
molecular orbitals in accordance with the available Δ and P values (see
Appendix). Specify the ground-state valence electron configuration of this
complex.
А) σ2σ 6σ 4πº 6σ* 1 C) σ2σ 6σ 4πº 5σ* 2
s p d d d s p d d d
B) σ2σ 6σ 4πº 4σ* 3 D) σ2σ 6σ 4πº 3σ* 4
s p d d d s p d d d

3. Linear combinations of which two orbitals (metal-based and ligand-
based ones) form the  - and *-MOs?
x x

А) C)

B) D)

4. How many electrons occupy bonding, antibonding, and non-bonding
MOs in this complex?
А) 12; 2; 5 C) 5; 2; 12
B) 12; 5; 2 D) 5; 12; 2
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5. Specify whether this complex is a high-spin or a low-spin one,
paramagnetic or diamagnetic.
А) paramagnetic C) high-spin
B) diamagnetic D) low-spin

Task 2. The electronic transition in a complex corresponds to the light
absorption at 495 nm. What color is the complex (see Appendix)?
А) green C) colorless
B) blue-green D) red

Variant 2
Task 1. Determine the electronic structure of the octahedral [FeF ]3−
6
complex within the framework of the molecular orbital (MO) theory.

1. The number of valence electrons in this complex is
А) 16 C) 18
B) 17 D) 19

2. Draw the MO-diagram of this complex (without accounting for the
π-bonding effect) and distribute valence electrons into atomic and
molecular orbitals in accordance with the available Δ and P values (see
Appendix). Specify the ground-state valence electron configuration of this
complex.
А) 2644*1 C) 2645
s p d d d s p d d
B) 2642*3 D) 2643*2
s p d d d s p d d d

3. Linear combinations of which two orbitals (metal-based and ligand-
based ones) form the  - and * -MOs?
x2y2 x2y2

А) C)

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B) D)

4. How many electrons occupy bonding, antibonding, and non-bonding
MOs in this complex?
А) 12; 2; 3 C) 12; 5; 2
B) 12; 3; 2 D) 12; 3; 1

5. Specify whether this complex is a high-spin or a low-spin one,
paramagnetic or diamagnetic.
А) paramagnetic C) high-spin
B) diamagnetic D) low-spin

Task 2. The electronic transition in a complex corresponds to the light
absorption at 654 nm. What color is the complex (see Appendix)?
А) green C) colourless
B) blue-green D) red

Variant 3
Task 1. Determine the electronic structure of the octahedral [Co(CN) ]3−
6
complex within the framework of the molecular orbital (MO) theory.

1. The number of valence electrons in this complex is
А) 16 C) 18
B) 17 D) 19

2. Draw the MO-diagram of this complex (without accounting for the
π-bonding effect) and distribute valence electrons into atomic and
molecular orbitals in accordance with the available Δ and P values (see
Appendix). Specify the ground-state valence electron configuration of this
complex.
А) 2644*2 C) 2646
s p d d d s p d d
B) 2643*3 D) 2645*1
s p d d d s p d d d
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3. Linear combinations of which two orbitals (metal-based and ligand-
based ones) form the  - and *-MOs?
z z

А) C)

B) D)

4. How many electrons occupy bonding, antibonding, and non-bonding
MOs in this complex?
А) 12; 0; 6 C) 12; 5; 1
B) 12; 6; 0 D) 12; 3; 3

5. Specify whether this complex is a high-spin or a low-spin one,
paramagnetic or diamagnetic.
А) paramagnetic C) high-spin
B) diamagnetic D) low-spin

Task 2. The electronic transition in a complex corresponds to the light
absorption at 568 nm. What color is the complex (see Appendix)?
А) violet C) colourless
B) blue-green D) yellow-green

Variant 4

Task 1. Determine the electronic structure of the octahedral [Co(H O) ]2+
2 6
complex within the framework of the molecular orbital (MO) theory.

1. The number of valence electrons in this complex is
А) 16 C) 18
B) 17 D) 19
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2. Draw the MO-diagram of this complex (without accounting for the
π-bonding effect) and distribute valence electrons into atomic and
molecular orbitals in accordance with the available Δ and P values (see
Appendix). Specify the ground-state valence electron configuration of this
complex.

А) 2645*2 C) 2646
s p d d d s p d d
B) 2643*3 D) 2645*1
s p d d d s p d d d

3. Linear combinations of which two orbitals (metal-based and ligand-
based ones) form the  - and * -MOs?
z2 z2

А) C)

B) D)

4. How many electrons occupy bonding, antibonding, and non-bonding
MOs in this complex?
А) 12; 0; 6 C) 12; 5; 1
B) 12; 6; 0 D) 12; 2; 5

5. Specify whether this complex is a high-spin or a low-spin one,
paramagnetic or diamagnetic.
А) paramagnetic C) high-spin
B) diamagnetic D) low-spin

Task 2. The electronic transition in a complex corresponds to the light
absorption at 425 nm. What color is the complex (see Appendix)?
А) violet В) colorless
C) blue-green D) yellow-green
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Variant 5

Task 1. Determine the electronic structure of the octahedral [Fe(CN) ]4−
6
complex within the framework of the molecular orbital (MO) theory.

1. The number of valence electrons in this complex is
А) 16 C) 18
B) 17 D) 19

2. Draw the MO-diagram of this complex (without accounting for the
π-bonding effect) and distribute valence electrons into atomic and
molecular orbitals in accordance with the available Δ and P values (see
Appendix). Specify the ground-state valence electron configuration of this
complex.
А) 2646 C) 2644*2
s p d d s p d d d
B) 2643*3 D) 2645*1
s p d d d s p d d d

3. Linear combinations of which two orbitals (metal-based and ligand-
based ones) form the  - and *-MOs?
s s

А) C)

B) D)

4. How many electrons occupy bonding, antibonding, and non-bonding
MOs in this complex?
А) 12; 0; 6 C) 12; 5; 1
B) 12; 6; 0 D) 12; 3; 3

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5. Specify whether this complex is a high-spin or a low-spin one,
paramagnetic or diamagnetic.
А) paramagnetic C) high-spin
B) diamagnetic D) low-spin

Task 2. The electronic transition in a complex corresponds to the light
absorption at 600 nm. What color is the complex (see Appendix)?
А) green В) colorless
C) orange D) green-blue

Variant 6

Task 1. Determine the electronic structure of the octahedral [Mn(H O) ]2+
2 6
complex within the framework of the molecular orbital (MO) theory.

1. The number of valence electrons in this complex is
А) 16 C) 18
B) 17 D) 19

2. Draw the MO-diagram of this complex (without accounting for the π-
bonding effect) and distribute valence electrons into atomic and molecular
orbitals in accordance with the available Δ and P values (see Appendix).
Specify the ground-state valence electron configuration of this complex.
А) 2645 C) 2644*1
s p d d s p d d d
B) 2643*2 D) 2642*3
s p d d d s p d d d

3. Linear combinations of which two orbitals (metal-based and ligand-
based ones) form the  - and *-MOs?
y y

А) C)

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B) D)

4. How many electrons occupy bonding, antibonding, and non-bonding
MOs in this complex?
А) 12; 2; 3 C) 12; 5; 0
B) 12; 4; 1 D) 12; 3; 2

5. Specify whether this complex is a high-spin or a low-spin one,
paramagnetic or diamagnetic.
А) paramagnetic C) high-spin
B) diamagnetic D) low-spin

Task 2. The electronic transition in a complex corresponds to the light
absorption at 750 nm. What color is the complex (see Appendix)?
А) purple C) colourless
B) orange D) green

Variant 7

Task 1. Determine the electronic structure of the octahedral [Co(NH ) ]3+
3 6
complex within the framework of the molecular orbital (MO) theory.

1. The number of valence electrons in this complex is
А) 16 C) 18
B) 17 D) 19

2. Draw the MO-diagram of this complex (without accounting for the
π-bonding effect) and distribute valence electrons into atomic and
molecular orbitals in accordance with the available Δ and P values (see
Appendix). Specify the ground-state valence electron configuration of this
complex.
А) 2646 C) 2644*2
s p d d s p d d d
B) 2643*3 D) 2645*1
s p d d d s p d d d
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