Coordination compounds. Molecular orbital theory : tests = Комплексные соединения. Теория молекулярных орбиталей : тесты


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

        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 / contributors : 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

2

    INDIVIDUAL TASKS


    Variant 1


Task 1. Determine the electronic structure of the octahedral [Co(NH3)6]²⁺ complex within the framework of the molecular orbital (MO) theory.


1.  The number of valence electrons in this complex is

А) 18
B) 19


C) 20
D) 21

2. Draw the MO-diagram of this complex (without accounting for the п-bonding effect) and distribute valence electrons into atomic and molecular orbitals in accordance with the available A and P values (see Appendix). Specify the ground-state valence electron configuration of this complex.
А) -.<■:•■*                 C) OsVodVdV?
B) QsVodVdVd³               D) QsVod4n%*d⁴


3. Linear combinations of which two orbitals (metal-based and ligand-

                                *
based ones) form the <7X - and ax -MOs?

А)

B)

C)

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

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 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 [FeF6]³ 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 п-bonding effect) and distribute valence electrons into atomic and molecular orbitals in accordance with the available A and P values (see Appendix). Specify the ground-state valence electron configuration of this complex.

2—6—4 —°5
C⁾ asapad^J

D)


2—6—4 — °4—*1 A⁾ °а°Л Od

     2—6 — 4 —°2-*3
B⁾ ОО°~, Od

—2—6—4 — °3— *2
О О О ^TZj О л s pdd d

4

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)6]³ 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 п-bonding effect) and distribute valence electrons into atomic and molecular orbitals in accordance with the available A and P values (see Appendix). Specify the ground-state valence electron configuration of this

complex.
А) ^»j^:⁴^:²
b) tXt»*³


C)
D)

  2 6 4 ^об
Ts Оp^d^d
_2 б 4 o5 *1
О О О,, i О л
  s pdd  d

5

3. Linear combinations of which two orbitals (metal-based and ligand-

*
based ones) form the <tz - and az -MOs?

А)

B)

C)

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(H2O)6]²⁺ 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


6

2. Draw the MO-diagram of this complex (without accounting for the п-bonding effect) and distribute valence electrons into atomic and molecular orbitals in accordance with the available A and P values (see Appendix). Specify the ground-state valence electron configuration of this complex.

    2-,.6 _4 ^-5^*²

        A⁾ asapad~d &d

    2_6 _4 ^-3 *3
B⁾ WpWi ^d

C)264

        jPd^


-6 d

*1 d

D) P^V

3. Linear combinations of which two orbitals (metal-based and ligand-

a 2 -MOs? z



C)

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


7

    Variant 5


Task 1. Determine the electronic structure of the octahedral [Fe(CN)6]⁴ * 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 п-bonding effect) and distribute valence electrons into atomic and molecular orbitals in accordance with the available A and P values (see Appendix). Specify the ground-state valence electron configuration of this complex.


        А)  afa⁶ₚaffi

B)  a²apad^d³a*3


c) ^»j^:⁴^:²
d) aa ^>*1

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

А)

B)

D)

4. How many electrons occupy bonding, antibonding, and non-bonding

MOs in this complex?
А) 12; 0; 6

B) 12; 6; 0

C) 12; 5; 1
D) 12; 3; 3

8

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(H2O)6]²⁺ 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 n-bonding effect) and distribute valence electrons into atomic and molecular orbitals in accordance with the available A and P values (see Appendix). Specify the ground-state valence electron configuration of this complex.

    2_6_4 ^°5
А) asapadⁿd
B) a ²a⁶a 4л°³ *a*²
    s pdd d


2—6—4—°4— *1 C⁾ ^s^p^d^d ad
D) a a 6a »*³
s pdd d

3. Linear combinations of which two orbitals (metal-based and ligand-

based ones) form the ay - and a* -MOs?

А)

C)

9

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(NH3)6]³⁺ 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 п-bonding effect) and distribute valence electrons into atomic and molecular orbitals in accordance with the available A and P values (see Appendix). Specify the ground-state valence electron configuration of this

complex.
    2—6—4  °6

        A⁾  asapaj~j

B)  & 2^ 6^ 4л°3CT*³
    s pdd d


C)
D)

  2 6 4 °4 *2
°\ ^p^d^d ^d
  2 6 4 °5 *1
asapad^d ad

10