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Comparative Study Of Transition Element Question Paper

Comparative Study Of Transition Element

Course:Bachelor Of Science

Institution: Kenyatta University question papers

Exam Year:2011

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2011/2012
INSTITUTE OF OPEN LEARNING – (IOL)
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE AND BACHELOR OF SCIENCE (EDUCATION)
SCH 400: COMPARATIVE STUDY OF TRANSITION ELEMENTS
DATE: Saturday, 17th December, 2011 TIME: 2.00 p.m. – 4.00 p.m.
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INSTRUCTIONS:
Attempt ALL questions.
Question 1
Explain the meaning of the term transition element citing suitable examples. Describe three common properties that characterize transition elements. Write the electron configuration of 29Cu, 42Mo, 64Gd and 95Am and explain why the lanthanides and actinides also called inner transition elements. (12 marks)
Question 2
Give a plausible explanation for each of the following observations
a) TiC14 dissolves in dry organic solvents but fumes in water depositing a white precipitate. (4 marks)
b) A good number of transition metals or their compounds have catalytic properties not seen in non-transition metals. (4 marks)
c) VF5 is a viscous liquid while VC15 is either very unstable or does not form.
(4 marks)
d) Tantalum is more suitable for bone repair but not iron even though it is cheaper.
(4 marks)
Page 2 of 2
Question 3
Write a balanced net ionic equation for each of the following reactions.
a) A solution of Na2Cr2CO7 turns from orange to yellow on addition of an alkali and back to orange when acidified. What is the origin of color in these oxoanions? (4 marks)
b) both acidic and alkaline permanganate, MnO4- solutions are decolorizing by potassium iodide solutions. (6 marks)
c) Pale green FeC12 dissolves in water but the solution turns rusty brown after some time of exposure to air while FeC13 hydrolyzes in water depositing a rusty brown solid. (5 marks)
Question 4
Briefly discuss the conversion of ilmenite, FeTiO3, to pigment grade TiO2. What are the main uses of TiO2 and what properties make it suitable for each of the uses?
(12 marks)
Question 5
a) Draw the structures of the following species:-
i) WBr2
ii) NbBr5
iii) TiF4
b) Briefly describe the polymerization of 1 – butane over TiCl4/AlEt3. What is the
role of each of the components of the catalyst? Could you expect an atactic or isotactic polymer? Explain your answer. (9 marks

Comparative Study Of Transition Element Question Paper

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