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Comparative Study Of Transition Elements Question Paper

Comparative Study Of Transition Elements

Course:Bachelor Of Science

Institution: Kenyatta University question papers

Exam Year:2007

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2007/2008
INSTITUTE OF OPEN LEARNING
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE
SCH 400: COMPARATIVE STUDY OF TRANSITION ELEMENTS
DATE: TUESDAY, 8TH JULY 2008 TIME: 1.00 P.M. – 3.00 P.M.
INSTRUCTIONS: Attempt ALL Questions.
1. (a) Explain what you understand by the phrase “transition element” and
give two examples of such elements. (4 marks)
(b) Write the electron configurations for the following species:-
(i) V3+ ion
(ii) Mn2+ ion
(iii) Nb4+ ion
(iv) W3+ ion
(v) Fe6+ ion
(12 marks)
[Total for Q1 … 16 marks]
2. (a) Explain how the ionic sizes vary as one moves along a given series
from left to the right and give the reasons for these variations. (6 marks)
(b) When a sample of cobalt(III) oxide is boiled with concentrated
sulfuric acid, oxygen gas is given off. On concentrating the solution,
the solid left is found to be strongly paramagnetic. Give reasons for
these observations, supporting your answers, as far as possible, with
balanced chemical equations. (14 marks)
[Total for Q2 … 20 marks]
2
3. Name two important minerals of titanium. (2 marks)
Outline very briefly:-
(i) How a reasonably pure sample of titanium may be extracted from one
of the minerals you have named.
(ii) How a sample of pigment grade rutile can be manufactured from any
of the minerals you have named. (18 marks)
[Total for Q3 … 20 marks]
4. Draw the structures of the following species:-
(i) Molybdenum hexacarbonyl
(ii) The complex species in MoCl2
(iii) [MnO4]-
(iv) [VO3]-
(v) ReCl3
(vi) [Cr2O7]-
(vii) NbBr5
(14 marks)
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Comparative Study Of Transition Elements Question Paper

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