Loyola College Nuclear & Radio Chemistry Question Papers
Loyola College M.Sc. Chemistry April 2008 Nuclear & Radio Chemistry Question Paper PDF Download
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – CHEMISTRY
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SECOND SEMESTER – APRIL 2008
CH 2952 – NUCLEAR AND RADIO CHEMISTRY
Date : 29-04-08 Dept. No. Max. : 100 Marks
Time : 1:00 – 4:00
Part A
Answer the following: 10 x 2 = 20 marks
- What are magic numbers? What is its significance?
- What is the difference between sub-atomic particles and basic particles?
- Why are electrons not found in the nucleus?
- Why is γ- rays emitted in all nuclear processes?
- When does emission of X-rays occur from nucleus?
- What are primary radiolytic products? How are they significant?
- Explain Szillard Charmer’s process. What is its application?
- What are stellar reactions?
- What are synthetic elements?
- What are thermal neutrons?
Part B
Answer any EIGHT of the following: 8 x 5 = 40 marks
- What are mesons? How do they stabilize the nucleus?
- Calculate density of 20Ne nucleus. What is inferred from the value of the density?
- Account for the following:
(a) Halogens have isotopes with alternate mass numbers. (b) Helium, oxygen and calcium have very few isotopes.
- Explain decay constant and half-life of a nucleus. Calculate these factors for a process, in which 30% completion was observed in 45 min.
- What are the limitations of shell model?
- Explain β+ emission and electron capture. How are they related to each other?
- Explain principle of scintillation counters and their classification
- Explain energy tapping by nuclear fusion? Why is this process useful for destructive purposes only?
- What is meant by carbon dating? What are its applications?
- Explain the working principle of charged particle accelerators.
- Why is nuclear pollution of hydrosphere considered most dangerous?
- What is neutron diffraction? What are its advantages and disadvantages?
Part C
Answer any FOUR of the following: 4 x 10 = 40 marks
- Discuss the concept of mass defect and binding energy. How is the factor ‘binding energy per nucleon’ useful to predict the stabilities of a nucleii?
- How does liquid drop model explain various spontaneous processes of an unstable nucleus?
- Discuss the mechanism of radiolysis of water.
- Explain the plot of signal size to applied potential obtained in an ion chamber. Also mention the suitable counters in each region.
- Write an essay on breeder reactors with special reference to working principle and
- How are solvated electrons produced? Discuss models available for their stabilities.
Loyola College M.Sc. Chemistry April 2009 Nuclear & Radio Chemistry Question Paper PDF Download
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – CHEMISTRY
|
SECOND SEMESTER – April 2009
CH 2954 / 2952 – NUCLEAR AND RADIO CHEMISTRY
Date & Time: 27/04/2009 / 1:00 – 4:00 Dept. No. Max. : 100 Marks
PART A
Answer the following: 10 x 2 = 20 marks
- How are basic particles different from sub-atomic particles?
- Why do nuclei show quadrupole moment?
- Explain nuclear isomerism?
- When does a nucleus emit α-particle?
- What is a compound nucleus? Cite an example.
- What is the source of neutrons in a fission reactor?
- What is the range of α particles less than that of β?
- What is meant by ‘Linear Energy Transfer’?
- What is the application of positron-annihilation technique
- What is the principle of carbon-dating?
PART B
Answer any EIGHT of the following: 8 x 5 = 40 marks
- Compare properties of mesons and electrons.
- Explain any two reasons to expect nucleons inside the nucleii are independent of each other.
- Using Shell Model of nucleus explain magic numbers.
- Explain the principle of Mossbauer spectroscopy.
- A radioactive isotope (mass number=200) emits one α particle with a half life of 30min. If 20g of this isotope was allowed to stand in a sealed vessel for 40min, what shall be the volume (at STP) of helium present in the container?
- Give an account of counters employed to measure intensity of radiation.
- Explain nuclear fusion reaction and its applications.
- Explain principle and working of cyclotron.
- Write a note on chemical dosimeters.
- Discuss the preparation and properties of solvated electrons.
- How are radioactive isotopes useful in understanding chemical reaction mechanisms?
- What are the advantages, disadvantages and threats of tapping nuclear energy?
PART C
Answer any FOUR of the following: 4 x 10 = 40 marks
- Using concepts of liquid drop model derive an expression for binding energy of a nucleus.
- Discuss various spontaneous and induced nuclear processes.
- Explain the use of fission reaction to produce energy and principle involved in it.
- Explain proposed mechanisms for radiolysis of water.
- Explain the principle and uses of isotope dilution analysis.
- Write short notes on
- Szillard Charmer’s Process.
- Aufbau Order for filling of nucleons in shells.
Loyola College M.Sc. Chemistry April 2012 Nuclear & Radio Chemistry Question Paper PDF Download
LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
M.Sc. DEGREE EXAMINATION – CHEMISTRY
SECOND SEMESTER – APRIL 2012
CH 2954 – NUCLEAR AND RADIO CHEMISTRY
Date : 24-04-2012 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
Part – A
Answer all the questions: (10 x 2 = 20)
- What is meant by mass defect of a nucleus?
- What is binding energy per nucleon? What is its significance?
- Derive a relationship between t1/2 and decay constant of a radioactive isotope.
- What are dosimeters? How are they classified?
- What is meant by electron capture?
- When does a nucleus emit gamma ray?
- What are nuclear isomers?
- What is n/p ratio of a nucleus? What is its significance?
- What is meant by compound nucleus?
- How are nuclear processes classified? Give examples for each class.
Part – B
Answer any eight questions: (8 x 5 = 40)
- Discuss mesons in terms of their types, characteristics and roles.
- Why are electrons not found in the nucleus?
- Explain odd-even rule with examples.
- An isotope of plutonium with mass number 240 disintegrates to form stable 232 Assuming only a and b–particles are emitted, deduce the number of a and b– emitted in this process.
- Explain the difference between a spallation reaction and nuclear fission reaction citing an example.
- Natural isotopic abundance of 79Br and 81Br are 75% and 25% respectively. Calculate the atomic weight of bromine obtained from natural sources ?
- How are nuclear wastes disposed?
- What are the qualities of a good coolant used in nuclear reactors?
- Account for the fact that tin has many isotopes whereas lead has only a few.
- What is meant by ‘Hot atom chemistry’? What is its application?
- Briefly explain an experiment to prove that large volume of an atom is empty space.
- Explain spontaneous and induced nuclear processes with one examples.
Part – C
Answer any four questions: (4 x 10 = 40)
- Discuss factors affecting stability of a nucleus.
- Discuss any two models available for filling of nucleons in the nucleus.
- Why are nuclear fusion reactions unsuitable for energy tapping?
- Explain the production of solvated electrons and a method to study its properties.
- Explain the use of radioactive isotopes in understanding chemical reaction mechanisms.
- Explain the working and use of Fricke dosimeter.