M.Sc. (Semester III) (CBCS) Examination Mar/Apr-2018
Inorganic Chemistry
NUCLEAR CHEMISTRY
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Section I is compulsory Attempt any two questions from Section II and any two from Section-III Answer to all questions (Section II, and III) should be written in the same answer book Figures to the right indicate full marks. All questions carry equal marks. Use of calculator and log-table is allowed.
SECTION I
Q.1
Answer the following:-
14
What is threshold energy of nuclear reaction?
Complete the following nuclear reaction 92U238 (7N14,α
Why cadmium and boron metals are used as a control rod in fission reactor?
On which factors does the stability of nucleus depend?
What is nuclear potential?
Who has proposed the term radioactivity?
What is radiolysis? List the products of radiolysis of water.
Which methods are employed in isotope separation?
What is critical mass?
10) Name the heavy water production plants in India.
11) Which quantity is used deciding nuclear reaction?
12) What is elastic scattering?
13) What is the reproduction factor K for nuclear reactors?
14) What is nuclear cross section?
SECTION II
Q.2
What are magic and semi magic numbers? Give experimental evidence in support of magic numbers.
07
Explain heavy water manufacture in India.
07
Q.3
What are special nuclear reactions? Give Bohr's hypothesis of compound nucleus for nuclear reaction.
07
Discuss the formation of compound nucleus and compound nucleus theory in explaining the nuclear reaction mechanism.
07
Q.4
Discuss the different types of interactions between the charged particles of medium energy and matter.
07
Explain the heavy nuclei posses excess neutrons? Find the most stable isobar amongst 28Ni64 and 30Zn64 given that experimental mass of these nuclei are 63.9380 a.m.u. and 63.9292 a.m.u. The masses of proton and neutron are 1.007825 a.m.u. and 1.008665 a.m.u. respectively.
07
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SLR-UF-249
SECTION III
Q.5
How the nuclear reactors are classified? Discuss the construction and working of graphite moderated liquid sodium cooled reactor.
05
Discuss the prospects of the thermonuclear reactors as sources of energy.
05
Discuss the N/P ratio nuclear stability.
04
Q.6
Explain nuclear fission cross section and fission threshold energy.
05
U238 cannot be act as a nuclear fuel but it can act as a potential source of a nuclear fuel. Explain.
05
Explain the nuclear stability with respect to binding energy.
04
Q.7
Write notes on any three:-
14
Extraction of uranium
Fermi gas model
Research reactor
Photonuclear reactions