Karunya University 2009 B.Sc Chemistry Supplementary , ./t, – I : Theoretical and Inorganic – I (Prior to 2006 Admn.) - Question Paper

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Reg. No. : .........................

Name : ..............................

B.Sc. Supplementary Degree Examination, Aug./Sept. 2009 Part III – Group III : CHEMISTRY

Paper – I : Theoretical and Inorganic Chemistry – I (Prior to 2006 Admn.)

Time: three Hours Max. Marks: 60

Instructions : ans all the ques.. ans either (a) or (b) from

every ques..

PART – A

every ques. carries two marks.

1. a) Write the general form of the Schrodinger formula and discuss the terms in it. OR

b) Explain the different lines in the atomic spectrum of hydrogen atom.

2. a) elaborate the assumptions of Bohr's theory ?

OR

b) How do the Bohr's theory differ from that of Schrodinger ?

3. a) elaborate the physical significance of Heisenberg's uncertainty principle ?

OR

b) Explain the concept of quantum numbers.

4. a) Derive the point groups of the subsequent molecules :
i) Trans-N2F2 and ii) diborane

OR

b) elaborate the symmetry elements current in CHCl3 molecules ?




P.T.O.


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5. a) discuss radioactive displacement legal regulations. OR

b) Write the 4 radioactive decay series.

6. a) elaborate the major applications of radioactive isotopes ?

OR

b) How does the avg. binding energy per nucleon vary with the atomic number of the element ?

7. a) Electron affinities of halogens are high. discuss.

OR

b) The ionization energy of Na+ is more than that of Ne, although both have the identical electronic configuration. Why ?

8. a) explain the factors which influence the electronegativity of an atom.

OR

b) Ionization energies of C, N and O follows the order C < N > O. provide reasons.

9. a) discuss why CO2 and CCl4 molecules are non-polar, while CHCl3 molecule is polar.

OR

b) Write the electronic configuration of a diatomic molecule having bond order three.

10. a) How does the size vary in the subsequent series ? N3–, Na+, Mg2+ and Al3+, O2–, F – ?
OR

b) The dipole moment of NH3 is greater than that of NF3. discuss. (10×2=20 Marks)

PART – B

every ques. carries 4 marks.

11. a) Compare valence bond theory and molecular orbital theory. OR

b) elaborate intermolecular forces ? How do these forces originate ?


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12. a) elaborate Londen dispersion forces ? discuss.

OR

b) What is resonance ? explain resonance using CO23- ion.

13. a) How do ionization energy and electron affinity vary in the periodic table down the groups ?

OR

b) Compare the electronegativity explanations provided by Pauling, Alfred and Mulliken.

14. a) explain the exchange theory of nuclear forces.

OR

b) Compare nuclear fission and fusion as sources of energy.

15. a) explain VSEPR theory.

OR

b) What is hybridisation ? elaborate the important rules of hybridisation.
(5×4=20 Marks)

PART – C
every ques. carries 10 marks.
16. a) i) explain Born formula for theoretical computation of lattice energies. What
conclusions can be drawn from this formula ?
ii) explain Born-Haber Cycle. (5+5=10)
OR
b) i) explain ligand field theory of coordination compounds.
ii) elaborate the consequences of inter and intramolecular hydrogen (5+5=10)
bonds ?
17. a) i) explain Heisenberg's uncertainty principle.
ii) explain briefly the limitations of Bohr's theory of atomic structure. (5+5=10)
OR
b) i) Derive the Schrodinger wave formula.
ii) elaborate radial and angular wave functions ? (6+4=10)
(2×10=20 Marks)


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