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National Open University Exam Past Question – CHM306 JUNE/JULY 2013 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA

14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY JUNE/JULY EXAMINATION

 

COURSE CODE: CHM306

COURSE TITLE: INSTRUMENTAL METHODS OF ANALYSIS TIME ALLOWED: 2 hours

INSTRUCTION: ANSWER FOUR QUESTIONS ONLY

 

Question 1

a) What is the relationship between absorbance and transmittance? (5 marks)
b) State Beer’s and Lambert’s law (3 marks)

 

2
  1. c) A sample in a 0-cm cell is determined with a spectrometer to transmit 70% light at a certain wavelength. If the absorptivity of this substance at this wavelength is 2.0, what is the concentration of the substance?                                                                             (9 1  marks)

Question 2

  1. a) Explain the following in relation to infrared techniques:
2
  1. i) radiation source  ii)  monochromatic    iii)    detector                            (7 1  marks)
  2. b) In what ways is the study of infrared spectroscopy relevant to an analytical chemist?

(10 marks)

Question 3

  1. a) Discuss the sensitivity and detection limit in atomic absorption spectroscopy  (5 marks)
2
  1. b) Briefly explain the basic application of x-ray spectroscopic analysis  (7  1  marks)
  2. c) Outline six application of fluor                                                              (5 marks)

Question 4

  1. a) With the aid of a well-labeled schematic diagram, briefly explain the working principle of atomic absorption spectrophotometer. (10 marks)

 

2
  1. b) Outline major types of interferences encountered in atomic absorption analysis and describe how such problems can be overcome. (7  1  marks)
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Question 5

a) What advantages does coulometric has over the conventional titration. (5 marks)
b) Outline five general applications of coulometric methods. (5 marks)
2
  1. c) State the five applications of refractomete  (2  1  marks)
  2. d) What are the applications of NMR?  (5 marks)

Question 6

  1. a) What is meant by each of the following:
  2. i) Specific conductance
 1
  1. ii) Molar conductance                                                                                   (4 2  marks)
  2. b) Explain the basic principles of conductimetric analysis.
  3. c) With the aid of a good diagram, describe the basic instrumental design of a conductivity meter.  (10marks)
  4. d) Outline three applications of polarography  (3 marks)

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