NATIONAL OPEN UNIVERSITY OF NIGERIA
UNIVERSITY VILLAGE, PLOT 91 CADASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI – ABUJA.
FACULTY OF SCIENCES
DEPARTMENT OF PURE AND APPLIED SCIENCES
JULY 2018 EXAMINATION
COURSE CODE: CHM 306
COURSE TITLE: INSTRUMENTAL METHODS OF ANALYSIS
COURSE UNIT: 2
TIME: 2 HOURS
INSTRUCTION: Question one is compulsory. Answer question one and any other three questions.
QUESTION ONE
a) Compare and contrast between the following in terms of what happens when they absorb electromagnetic radiation, and the region of the electromagnetic radiation where they absorb energy:
Electronic spectroscopy
Vibrational spectroscopy
Rotational spectroscopy 71/2 Marks.
aii) Write short on absorption of radiation and emission of radiation. 61/2 marks
bi) What is fluorescence spectroscopy. 3 marks
bii) List one compound that can be determined by fluorescence spectroscopy. 1mark
biii) Mention one applications of fluorescence spectroscopy. 1 mark
ci) Explain the basic concept or theory of conductimetry. 5 marks
cii) Highlight the major application of conductimetry. 1 mark
QUESTION TWO
a) What is the principle behind optical methods of analysis? 11/2 marks
b) State and explain briefly the types of optical methods of analysis. 71/2 marks
ci) Write short note on the following terms:
i. Absorbance
ii. Transmittance. 3 marks
cii) Define the relationship between absorbance and transmittance. 3 marks
QUESTION THREE
a) What information can be obtained from measuring the refractive index of a compound using a refractometer? 51/2 marks
b) Describe how the refractive index of a compound can be determined using a refractometer.
7marks
c) List the major classes of spectroscopy that is associated with the nature of the radiation that is been absorbed or emitted. 21/2 marks
QUESTION FOUR
a) What happens when infrared radiation of a characteristic frequency interacts with a molecule? 71/2 marks
4b) Distinguish between Finger print region and Group frequencies. 71/2 marks
QUESTION FIVE
a) Discuss briefly the working principle of the following chemical instrumental method:
flame emission 71/2 marks
b) flame atomic absorption spectroscopy. 71/2 marks
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