NATIONAL OPEN UNIVERSITY OF NIGERIA
14-16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY JANUARY/FEBRUARY 2013 EXAMINATION
CHM 306: INSTRUMENTAL METHODS OF ANALYSIS INSTRUCTION: ANSWER FOUR QUESTIONS ONLY
(Each question carriers a total 17 1 marks). Duration: 2 hrs
- a) Distinguish clearly between absorption and emission spectroscopy. b) State Beer’s and Lambert’s law
- c) A sample in a 0-cm cell is determined with a spectrometer to transmit 80% light at a certain wavelength. If the absorptivity of this substance at this wavelength is 2.0, what is
the concentration of the substance? Question 2
- a) Discuss the types of molecular vibratio
- b) State the two radiation source used in infrared spectrometry as well as their respective compositio
- c) State the application of infrared spectrometr Question 3
- a) Compare and contrast between flame emission and flame absorption spectrosc b) Outline major types of interferences encountered in atomic absorption analysis and
describe how such problems can be overcome.
- a) Outline four application of X-ray fluorescence analysis. b) Outline seven application of fluorimetr
- c) What is meant by each of the following:
- I) Quenching ii) Flourescent filter iii) Monochromator
- a) What advantages does coulometric has over the conventional titratio b) Outline five general applications of coulometric methods.
- c) State the five applications of refractometer.
- d) What is meant by refraction and refractive index?
- a) What is meant by each of the following:
- i) Specific conductance ii) Molar conductance
- b) Explain the basic principles of conductimetric analysis.
- c) With the aid of a good diagram, describe the basic instrumental design of a conductivity mete