Loyola College M.Sc. Chemistry April 2007 Instrumental Methods Of Chemical Analysis Question Paper PDF Download

LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

LM 36

M.Sc. DEGREE EXAMINATION – ZOOLOGY / BMIS

SECOND SEMESTER – APRIL 2007

CH 2901 – INSTRUMENTAL METHODS OF CHEMICAL ANALYSIS

 

 

 

 

Date & Time: 26/04/2007 / 1:00 – 4:00      Dept. No.                                       Max. : 100 Marks

 

 

Part-A   ANSWER ALL QUESTIONS (10 x 2 = 20)

 

  1. Define: (i) molarity (ii) ppm
  2. Explain Bathochromic shift with an example.
  3. What is the volume of 6M H2SO4 (MW=98 gmol-1) that contains 20 g of H2SO4 solute?
  4. What are the two sources of flames used commonly in Atomic Absorption Spectrometers?
  5. Define the specific rotation of an optically active compound.
  6. Determine the pH of 10-3M Ba(OH)2
  7. Compare the fundamental vibrational frequency of C-O and C=O.
  8. How is the internuclear distance determined by X-ray diffraction studies?
  9. Which of the following will give NMR signal (i) 8O16 and (ii) 6C13
  10. Predict the m/e value for the molecular ion peak of C6H6.

 

 

Part-B   ANSWER ANY FIVE QUESTIONS (5 x8 = 40)

 

  1. (a) State Beer-Lambert’s law and explain under what conditions it is not applicable.

(b) With a schematic diagram indicate the different parts and working of a Double-Beam Spectrophotometer. What are its advantages?                                      (3+5)

  1. With a sketch discuss the principle, parts and working of a fluorimeter and how it is used in the analysis of riboflavin (vitamin B2).
  1. With a diagram outline the principle, parts and working of a cold-vapor atomic absorption spectrometer in the determination of mercury in a given biological sample?
  1. With a schematic diagram discuss the principle, parts and working of a spectropolarimeter. Mention any one application.
  2. How is the fluoride content in water sample estimated using ion selective electrode?
  3. Describe the principle and instrumentation of NMR spectroscopy.
  4. Write an account of ‘Isotopic dilution analysis’.
  5. Calculate the fundamental frequency in the infrared absorption region for the C=C stretching vibration. (k = 9.77 x 105 dynes cm-1; c = 3 x 1010 cms-1)

 

 

 

Part-C   ANSWER ANY TWO QUESTIONS (2 x20 = 40)

 

  1. (a) Discuss in detail the instrumentation and application of nephelometry

 

(b) Discuss the principle and working of an Atomic Absorption Spectrometer

and how it can be used in the quantitative determination of lead (Pb2+) in blood.

(10+10)

  1. Define and explain briefly the following concepts and its importance with a

suitable example:

 

(a) Difference Spectrometry (b) turbidimetry (c) ICP AES   (d) monochromator

(e) hollow-cathode lamp                                                                    (4 each)

 

  1. (a) Discuss the principle and instrumentation of HPLC.

(b) Describe the applications of neutron diffraction.

 

  1. (a) Give an account of the application of IR spectroscopy.

(b) Distinguish the following

H    H                                            H           H

|      |                                              |             |

(i)    H –C—C—O—H           and       H—C—O—C—H    using NMR.

|      |                                              |             |

H    H                                            H           H

H

|

(ii)   CH3 –C—H           and           CH3 –C–OH             using IR

||                                            |

O                                           H

 

 

(iii)   CH3OH                 and          CH3–CH2–OH         using mass spectra.

 

 

 

 

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