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Chem 400: Descriptive Chemistry Of Transition Elements Question Paper

Chem 400: Descriptive Chemistry Of Transition Elements

Course:Bachelor Of Science

Institution: Catholic University Of Eastern Africa question papers

Exam Year:2015

Cuea/ACD/EXM/AUGUST - DECEMBER 2015/CHEMISTRY Page 1
ISO 9001:2008 Certified by the Kenya Bureau of Standards
THE CATHOLIC UNIVERSITY OF EASTERN AFRICA
MAIN EXAMINATION
AUGUST - DECEMBER 2015 TRIMESTER
FACULTY OF SCIENCE
DEPARTMENT OF CHEMISTRY
REGULAR PROGRAMME
CHEM 400: DESCRIPTIVE CHEMISTRY OF TRANSITION ELEMENTS
Date: DECEMBER 2015 Duration: 2 Hours
INSTRUCTIONS: Answer Question ONE and ANY OTHER TWO Questions
Q1. a) Give the electronic configuration of the following
i Cu ( Cu = 29)
ii Zr (Zr = 40)
iii W (w = 74) (3 marks)
b) Using the valence bond theory determine the following on ion in [Fe(CN6)4- i Hybridisation of iron
ii Geometry of the complex
iii Magnetic property
iv Type of complex [Fe = 26] (4 marks)
c) State FOUR factors that determine the magnitude of energy ?E.
(4 marks)
d) The following complexes exhibit isomerism. State the type of isomerism that they exhibit. Sketch and label them
i [Cr (H2O)4 Cl2]+ (2 marks)
ii [Mn (C2O4)3 ]3- (2 marks)
e) Using equations explain the following observations
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Cuea/ACD/EXM/AUGUST - DECEMBER 2015/CHEMISTRY Page 2
ISO 9001:2008 Certified by the Kenya Bureau of Standards
i When excess potassium iodide is added to aqueous solution of copper (II) sulphate in the presence of starch solution a deep blue colour is observed. (4 marks)
ii When a few drops of hydrogen peroxide is added to acidified potassium dichromate solution followed by ether, a blue colored solution results which quickly turn green. (3 marks)
f) Briefly discuss the following trends with regard to the first transition series
i Density. (4 marks)
ii Melting point and boiling point. (4 marks)
Q2. a) Define a metallocene. (2 marks)
b) Using an appropriate example, state THREE ways of preparing mettalocenes. (5 marks)
c) i Sketch the structure of ferrocene. (1 mark)
ii Write the following reactions of ferrocene in:
a) Fredel crafts acylation (in equimolar and in excess) (4 marks)
b) Fredel crafts alkylation. (2 marks)
iii State TWO uses of ferrocene. (2 marks)
d) With reference to ttungsten define relativistic contraction.
(4 marks)
Q3. a) Describe the extraction of titanium from ilmentite. (10 marks)
b) Titanium exhibits several uses that depend on its properties. State FIVE uses of titanium and state the physical property of each use indicated.
(10 marks)
Q4. Write an account of the lanthamids and actinedes. For each series
a) Indicate its position on the periodic table, range of elements and the sublevel being filled with electrons.
Cuea/ACD/EXM/AUGUST - DECEMBER 2015/CHEMISTRY Page 3
ISO 9001:2008 Certified by the Kenya Bureau of Standards
b) FOUR properties of each series.
c) TWO uses for each series
d) Their impact on the environment. (20 marks)
Q5. a) Copper (II) ions are blue, MnO4- is purple, TcO4- is red and ReO4- is white. Explain why these colors vary in the manner observed. (10 marks)
b) i Define a metallic carbonyl. (2 marks)
ii Explain why the metal atom in the carbonyl exists in low oxidation state. (2 marks)
c) Some elements in the 1st, 2nd and third transition series exhibit low unstable oxidation states. Briefly explain how these oxidation states can be stabilized. (6 marks)
*END*

Chem 400: Descriptive Chemistry Of Transition Elements Question Paper

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