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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:

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2007/2008
INSTITUTE OF OPEN LEARNING
SPECIAL/SUPPLEMENTARY EXAMINATION
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE
SCH 400: COMPARATIVE STUDY OF TRANSITION ELEMENTS
DATE: Monday 6th October 2008 TIME: 10.00am-12.00pm
INSTRUCTIONS: Attempt ALL Questions.
1. (a) Explain what you understand by the phrase “transition element” and give four examples of such an element to support your definition. (5marks)
(b) Give five properties of transition elements and, in each case, use a specific example to illustrate the property you have cited. (15marks)
2. (a) Explain why vanadium forms the pentafluoride, VF5, and yet, no similar compound is known for nickel. (6marks)
(b) When chromium (III) chloride is dissolved in water, all the chlorides are ionized. On the other hand, when molybdenum tetrachloride, MoCl3, in water, only a third of the halogens can be precipitated. Explain. (6marks)
(c) Give a possible reason why permanganate titration are carried out in acidic media supporting your answers, as far as possible with balanced chemical equations. (8marks)
3. (a) Name one important mineral of titanium from which the element is actually extracted. (2marks)
(b) Assume that you are lucky to get a job with a company that is mining this element and the main mineral is the one you have chosen. Describe very briefly a process that can be used to manufacture paint from this mineral. (18marks)
4. Draw the structure of each of the following ions and molecules:-
(i) The complexes, [Fe(H2O)6]2+
(ii) The complexes, Mo(CO)6
(iii) The anionic species in KVO3
(iv) CrF5
(v) ReCI3 (15marks)
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Comparative Study Of Transition Elements Question Paper

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