LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIFTH SEMESTER – NOVEMBER 2010

CH 5506 – TRANSITION ELEMENTS AND NUCLEAR CHEMISTRY

 

 

 

Date : 01-11-10                     Dept. No.                                                    Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

 

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

 

1. What are molybdates? Give the structure of molybdate ion.
2. Bring out the biological importance of manganese.
3. Why do lanthanides show the characteristic +3 oxidation state?
4. Name the three actinides that are found naturally on Earth.
5. Write the IVPAC name for each of the following complexes:
6.   [CrCl₃(py)₃]^X             b. [Pt(H₂NCH₂CH₂NH₂)₂Cl₂]Cl₂ .
7. Draw the fac and mer isomers of [Co(NH₃)₃Cl₃] and [Co(dien)₂] ³⁺ .
8. What is K-electron capture?
9. Write the mathematical expression of Geiger-Nuttal’s rule.
10. What are the limitations of breeder reactors?
11. Define the term critical mass.

PART – B

 

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

 

11. Discuss the toxic effects of cadmium.
12. Write a brief note on organo zinc compounds.
13. How is neptunium synthesized? What are its uses? Mention its oxidation states.
14. Describe the method of isolation of uranium from its ores.
15. Using VB theory explain the geometry and magnetism of [CoF₆]^3–and [Co(CN)₆]^3– .
16. What are chelates? Why are chelated complexes more stable than similar complexes

with monodentate ligands?

17. Explain the different factors that affect the magnitude of d-orbital splitting values in an

octahedral complex.

18. Write a note on the applications of radioactive isotopes in agriculture and biology.
19. Give the salient features of Shell model of the nucleus.
20. Explain the theory of nuclear fission.
21. Describe the construction and working of GM counter.
22. Explain the principle and application of neutron activation analysis.

 

PART – C

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

 

23. a) Discuss the various oxidations states exhibited by titanium. Which is the most stable

oxidation  state?                                                                                                                       (4)

1. b) How is chromium extracted from its ores? (6)
2. What is lanthanide contraction? What are its consequences?
3. a) Calculate the crystal field stabilization energy in terms of Δo for a d⁸ system in

octahedral and  tetrahedral complexes. Which is more stable?                                     (5)

1. b) What are the major drawbacks of VBT.
2. a) Mention the salient features of crystal field theory. How are d-orbitals split, when a

transition  metal ion is placed in (i) an octahedral field and (ii) a tetrahedral field?    (6)

1. b) Explain coordination isomerism with an example.                                                           (4)
2. a) What is n/p#ratio? How is related to stability of nuclei?                                                 (5)
3. b) What are alpha and beta decay? Give equations.                                                           (5)
4. Give an account of a nuclear fission reactor.

 

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