CHM306 : INSTRUMENTAL METHODS OF ANALYSIS (2018_2)

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

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