Introduction to Transition Metals and Coordination Chemistry (CHMS3205)
BSc, Chemistry - CHMS
Semester: Second Semester
Level: 300
Year: 2017
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REPUBLIC OF CAMEROON THE UNIVERSITY OF BAMENDA
PEACE - WORK - FATHERLAND P.O Box 39 Bambili
FACULTY OF SCIENCE Course Instructor: Prof. Agwara Moise Ondoh
Department of Chemistry Course Code and: CHMG3205
Academic Year: 2016/2017 Course Title : Coordination Chemistry
SEMESTE : 2 Duration : 3hours
Date: 02/08/2017 Time : 11:00-14:00
Instructions: Answer All Questions
QUESTION 1 :
a) Differentiate between the following, giving examples in each case
i. Coordination compounds and double salts
ii. Transition metals and d-block elements
iii. Labile and Inert
iv. Degeneracy and non-degeneracy
v. Ligand and Lewis base
b) Give the Group, Period and Block of the following elements m the Periodic Table
l)
30
X n)
29
X iii)
16
X iv)
12
X
c) Explain the following properties of transition metals, giving examples in each case
i) Variable Oxidation States
ii) Coloured compounds
iii) Catalytic activities
d) Complete the table below by stating the primary Valency, secondary Valency and electrolyte ratio of
each of the complexes below.
Complex
Primary Valency (
Secondary Valency
Electrolyte Ratio
K
3
[Fe(SCN)
6
]
[Ni(CO)
4
]
K
2
[Ni(CN)
4
l
[Ti(H
2
0)
6
]Cl
2
[Au(NH
3
)
2
]Cl
QUESTION 2
(a)Name the following compounds
i. [C
O
(NH
3
)
4
(N0
2
)C1]
+
ii. [Co(PPh
3
)
3
S
0
4
]Br
iii. [Cr(NH
3
)
6
][Co(CN)
6
]
iv. Na
3
[Co(N0
2
)6]
v. [Co(en)
3
]Cl
3
vi. KA1(S 0
4
)
2
12H
2
0
b) Give the formulas of the following
i. tetraamminenickel(II) perchlorate
ii. chlorobis(ethylenediamine)thiocyanatocobalt(III) tetrachlorocadmate(ll)
iii. bis(ethylenediamine) sulphatoiron (II)
iv. bis(ethylenediamine)cobalt (III) suphate
v. sodium hexanitritocobaltate (IIX)
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QUESTION 3
a) Considering the stability of complex ions in solution where M is the metal atom (or ion) and L a monodentatate
ligand, show that
=
QUESTION 4:
a) Using the VBT, give the hybridisation, geometry and the spin-only magnetic moment of the complexes
i) [Fe(CN)
6
]
+
ii)
[Mn(H
2
0)
6
]
3+
iii) [Ni(Cl)
5
]
3-
b) With the help of sketches, differentiate between e
g
and t
2
g
orbitals
c) On the basis of the Crystal Field Theory,
i) With aid of splitting diagrams, describe bonding in [Fe(H
2
0)
6
]
3+
and [Fe(CN)
6
]
3-
ii) Calculate the Spin Only magnetic Moments of each central metal ion
iii) Calculate the CFSE
iv) Compare the wavelengths of the colours of the two complex ions
v) Which of the two complexes is stable, why?
vi) State the ground state and first excited state electronic configuration of each complex
d) Explain Jahn Teller Distortion in [C
U
(H
2
0)6]
2+
QUESTION 5:
a) With the help of examples, define the following
i) Linkage Isomerism
ii) Ionisation isomerism
iii) Geometrical Isomerism
b) Draw all the isomers (geometrical and optical) of:
i) [CoCl
2
(en)
2
]
+
ii) [Co(NH
3
)Cl(en)
2
]
2+
iii) [Co(NH
3
)
2
Cl
2
(en)f
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