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 1s22s1 .

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.

You can get the exam summary answers for this course from 08039407882

Check the sample below

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