LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIFTH SEMESTER – APRIL 2011

CH 5506 – TRANSITION ELEMENTS AND NUCLEAR CHEMISTRY

 

 

 

Date : 18-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

Answer ALL questions.                                                                                             (10 x 2 = 20 marks)

 

1. Explain why most of the transition metals form coloured compounds.
2. What are interstitial compounds? Give any two examples.
3. What are actinides? Why are they so called?
4. Name any two minerals of lanthanides.
5. What is co-ordination number? Give an example.
6. What are ligands? Explain with an example.
7. Define radioactivity.
8. What are pi-mesons and K-mesons?
9. What are moderators? Give an example.
10. Explain orbital electron capture.

 

PART – B

Answer any EIGHT questions.                                                                            (8 x 5 = 40 marks)

 

11. Discuss the toxic effects of lead and mercury.
12. How is titanium extracted from its ores?
13. Explain the electronic spectra of lanthanide compounds.
14. Explain the metallurgy of uranium.
15. Explain spectrochemical series.
16. What is chelate effect? Explain.
17. Discuss Cis-trans isomerism in four coordinate square planar complexes.
18. Calculate packing fraction, mass defect and energy released in the formation of argon atom ⁴⁰Ar.   Isotopic mass of Ar = 39.96238 a.m.u.

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19. Discuss the shell model of nucleus on the basis of closed shells of magic number.
20. Describe the working of G.M.counter.
21. Differentiate between atom bomb and hydrogen bomb.
22. Discuss the atomic power projects in India.

 

PART – C

Answer any  FOUR  questions.                                                                          (4 x 10 = 40 marks)

 

23. (a) Explain the preparation of            (i) TiCl₃           (ii)  K₂Cr₂O₇

(b)  Explain the biological importance of any two transition  elements.

 

24. (a) Describe how lanthanides are separated  by ion-exchange chromatography.

(b)  How is neptunium synthesized?   Give its uses.

 

25. (a) Explain the postulates of VB theory of coordination compounds.

(b)  Give possible isomers of  [CO(NH₃)₂(H₂O)₂Cl₂]⁺.

 

26. (a) Discuss any three evidences to support crystal field theory.

(b)  Calculate the CFSE for octahedral high and low spin for d⁴, d⁷ configuration.

 

27. (a) Explain radioactive displacement law.

(b)  Describe the functioning of scintillation counter.

 

28. Explain the construction, working and applications of a nuclear reactor.