CHM 307 – ATOMIC AND MOLECULAR SPECTRUM AND SYMMETRY (2014)

NATIONAL OPEN UNIVERSITY OF NIGERIA

14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS

SCHOOL OF SCIENCE AND TECHNOLOGY

MARCH/APRIL 2014 EXAMINATION

 
COURSE CODE: CHM 307              
COURSE TITLE: ATOMIC AND MOLECULAR SPECTRUM AND SYMMETRY
TIME ALLOWED: 2 1/2 HOURS
 INSTRUCTION:ANSWER ANY FIVE QUESTIONS
 
1a) Write short note on electron shell.
1b) State the reason behind the electronic configuration of Lithium being written as 1s²2s^{1 .}
1c) DefineMadelung’s rule and explains its contribution to electronic configuration of transition
metals.
1d) The Aufbau principle rests on a fundamental postulate that the order of orbital energies is fixed,
both for a given element and between different elements: neither of this is true discuss.
 
2a) Each electron in an atom is described by four quantum number, discuss.
2b) Write out the ground state electron configurations in the orbital box notation showing electron
spin for
i. Chlorine
ii. Manganese
2c)  Highlight the appropriate combinations of orbital to form molecular orbital.
2d) Explain the magnetic behavior of oxygen molecule in relation to Molecular Orbital theory.
 
3a)State  the fundamental Thermodynamic formula
3b)  What is the effect, if density in the formula in 3a above is changed to molar density in an ideal
gas.
3c)   Derive Heat Capacity using quantum mechanics.
3d)   List two examples each of the below
a) Ions having sp² hybrid orbitals.
b) Ions having sp³ hybrid orbitals.
 
4a)   Write on dsp³ Hybrid orbital
4b) write the shape of compounds having the below hybrid orbital;
i. Sp
ii. sp²
iii. sp³
iv. dsp³
v. d²sp³
4c)  Draw the energy levels in a Hydrogen Molecule.
4d)  Highlight the steps to writing resonance.
 
5a)  Show the molecular orbital diagram for a diatomic Oxygen molecule.
5b)   What is the wavelength of a 100Ev
 
6a)   Define Rotational  Spectroscopy
6b)   Classify molecules based on Rotational behaviour
6c)  Explain Centrifugal distortion.
 
7a)  Enumerate the order of the effect of interaction responsible for small changes in spectra.
7b)  What is Symmetry?
7c)   Discuss the symmetry elements.
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Check the sample below