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National Open University Exam Past Question – CHM413 October, 2013 Examination

NATIONAL OPEN UNIVERSITY OF NIGERIA CHM413 ANALYTICAL CHEMISTRY II

14/16, Ahmadu Bello Way, Victoria Island

 

SCHOOL OF SCIENCE AND TECHNOLOGY October, 2013 Examination

 

COURSE CODE: CHM413

 

COURSE TITLE:  ANALYTICAL CHEMISTRY II

 

INSTRUCTION: Six questions to answer four                                                                Duration: 2 hours

 

 

Question 1

 

 

2
  1. a) Define the term ‘error’                                                                                                   (2  1  marks)
  2. b) List and explain the various types of error                                                                 ( 8 marks )
  3. c) Differentiate between accuracy and precisio                                                        ( 7 marks )

 

Question 2

Seven measurements of the pH of a buffer solution yielded the following results;

8.13,   8.21, 7.95, 8.21, 8.18, 8.20, 8.23

Calculate:

 1

  1. i) Mean  (3 2  marks)
  2. ii) Median (4 marks) iii) Standard deviation                                                                                                                       (5 marks) iv) The 95% confidence limits for the true mean.                                                                         (5 marks)

 

Question 3

 

2
  1. a) Explain the basic principle of a liquid membrane electrod                                      (8  1  marks) b)          List and explain the factors that affect the conductance of electrolyte solutions. (9 marks) Question 4
  2. a) List and explain five applications of the differential scanning calorimetry.              (10 marks)
2
  1. b) Explain the basic principle of ion-exchange chromatography.                                     (7  1  marks)

 

Question 5

 1

  1. a) Discuss the factors that affect the conductance of electrolyte solution                 (8 2  marks)
  2. b) Differentiate between thin layer chromatography and column chromatography. (9marks)
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Questions 6

Write short notes on the following:

 

  1. a) Electrochemical deposition         b)          Particulate radiation      c) Electromagnetic radiation

 1                                                             1

  1. d) Ion exchange techniqu                                                       (4 2  mark each; total of 17 2  marks)

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