LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

FIFTH SEMESTER – APRIL 2012

CH 5506 – TRANSITION ELEMENTS AND NUCLEAR CHEMISTRY

 

 

 

Date : 27-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

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

 

1. Explain why the molar volumes of transition elements are much lower than those of

s block elements of the neighbouring  groups.

2. Give the uses of ferro-vanadium alloy.
3. What are lanthanides?
4. Name any two minerals of actinides.
5. What is co-ordination number? Give an example.
6. What is chelate effect?
7. Define radioactivity.
8. What are pi-mesons and K-mesons?
9. What are radiopharmaceuticals? Give an example.
10. Define critical mass.

PART – B

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

 

11. Explain why most of the transition metals form coloured compounds.
12. How is titanium extracted from its ores?
13. What is lanthanide contraction? Explain any one consequence of it.
14. Explain the isolation of uranium.
15. Explain spectrochemical series. Mention the significance of the series.
16. What are ligands? Explain with an example.
17. Discuss Optical isomerism in coordination complexes with two examples.
18. A freshly cut piece of wood gives 16100 counts of β-ray emission per minute per kg and an

old wooden bowl gives 13200 counts per minute per kg.   Calculate the age of the wooden

bowl. The half-life period of ¹⁴C is 5568 years.

19. Describe the functioning of scintillation counter.
20. Explain the significance of ratio with examples.
21. Explain hydrogen bomb.

 

22. Discuss ‘neutron activation analysis’.

 

PART – C

 

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

 

23. (a) Discuss the toxic effects of cadmium.

(b)  Explain the preparation of  K₂Cr₂O₇.

 

24. (a) Explain the electronic spectra of lanthanide compounds.

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

 

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

(b)  Discuss the geometrical isomerism exhibited by coordination compounds with two

examples.

 

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)  Discuss the liquid drop model of the structure of nucleus.

 

28. (a) Discuss the atomic power projects in India.

(b)  Explain the construction and working of a nuclear reactor.

 

 

 

 

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