Chemistry Tutorials (XXXX)

BSc, Chemistry - CHMS

Semester: First Semester

Level: 200

Year: 2016

Answers (200 )
THE UNIVERSITY OF BAMENDA FACULTY OF SCIENCE
Department of Chemistry
Level 300 Tutorials
ANSWER ALL QUESTIONS
1. a) Explain why [Co(H
2
0)
6
]
3+
and [Co(NH
3
)6]
3+
differ in colour
b) What are the transitions usually observed in ligand spectra?
c) Differentiate between emission and absorption bands.
d) Using a d
2
system show clearly the interactions between the orbitals of these electrons.
2. a) How many energy states are in;
i)
7
N ii)
11
Si iii)[Ni(H
2
O)
6
]
2+
iv) [Cr(NH
3
)
6
]
2+
b) Determine the lowest energy term symbol for;
i)Co
2+
ii)
7
N iii)
5
B iv)
11
Na
c) what are the spectroscopic ground term symbols for;
i) [Ti(H
2
O)
6
]
3+
ii) [Cu(NH
3
)
4
]
2+
iii) [Cr(H
2
O)
6
]
2+
d) The spectrum of the complex ion [Ti(H
2
O)
4
]
3+
shows an absorption band at 900cm-:
i) Derive the ground spectroscopic term symbol.
ii) Draw the energy diagram.
iii) What is the electronic transition?
e) The spectrum of the complex ion [Ti(H
2
0)
6
]
3+
also revealed a band at Xcm-:
i) What is the value of X?
ii) Derive the ground spectroscopic term symbol
iii) Draw the energy diagram
iv) What is the emission electronic transition?
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