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National Open University Exam Past Question – CHM 306 JANUARY/FEBRUARY 2013 EXAMINATION

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

2

(Each question carriers a total 17  1  marks). Duration:                      2 hrs

 

Question 1

  1. a) Distinguish  clearly between absorption and emission spectroscopy. b)  State Beer’s and Lambert’s law
  2. 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

  1. a) Discuss the types of molecular vibratio
  2. b) State the two radiation source used in infrared spectrometry as well as their respective compositio
  3. c) State the application of infrared spectrometr Question 3
  4. 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.

Question 4

  1. a) Outline four application of X-ray fluorescence analysis. b)  Outline seven application of fluorimetr
  2. c) What is meant by each of the following:
  3. I) Quenching    ii)     Flourescent  filter    iii)           Monochromator

Question 5

  1. a) What advantages does coulometric has over the conventional titratio b)  Outline five general applications of coulometric methods.
  2. c) State the five applications of refractometer.
  3. d) What is meant by refraction and refractive index?
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Question 6

  1. a) What is meant by each of the following:
  2. i) Specific conductance ii)         Molar conductance
  3. b) Explain the basic principles of conductimetric analysis.
  4. c) With the aid of a good diagram, describe the basic instrumental design of a conductivity mete

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