M.Sc. (Semester IV) (CBCS) Examination Nov/Dec-2018
Inorganic Chemistry
INSTRUMENTAL TECHNIQUES
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Section I is compulsory Attempt any two questions from section II and section III. Answer to all questions (Section II and III) should be written in same answer book. All questions carry equal mark. Figures to right indicate full marks. Use of log tables and non programmable calculator is allowed.
Section I
Q.1
Answer the following:
14
What is differential scanning calorimetry?
Which reference material is used in DSC?
What is the relation of isomer shift with s-electron density of Mössbauer nuclei?
Name the main components in instrumentation of X-ray spectroscopy.
What do you mean by coherent and incoherent scattering in X-ray radiations?
How exactly ESR differentiate from NMR in electromagnetic spectrum?
What is hyperfine splitting in ESR?
What is Mössbauer effect?
Define Doppler broadening in Mössbauer spectrum?
What is the use of thermally insulated Dewar flask in thermometric titrations?
Define thermal analysis.
Name the factors causing neutron diffraction.
Define differential thermal analysis.
What are thermometric titrations?
Section II
Q.2
Explain the Instrumentation and application of TMA.
07
What is thermogravimetric analysis? Give the sample characteristics which affect the thermogravimetric curves.
07
Q.3
Explain the powder crystal method of X-ray diffraction used in determination of crystal structure of compounds.
07
Discuss the applications of Mössbauer spectroscopy.
07
Q.4
What is Mössbauer spectroscopy? Draw the schematic diagram of Mössbauer spectrophotometer and explain its principle.
07
Explain the splitting of NQR spectra in nucleus having spin I 1 and I 2 and show the observed NQR transitions.
07
Page 2 of 2
SLR-VF-197
Section III
Q.5
Explain the principle of neutron diffraction. How intense beam of monochromatic neutrons can be produced?
05
Draw a schematic DTA curve for the decomposition of CaC2O4∙H2O in air and in CO2 atmospheres and explain the nature of the curves.
05
How you will differentiate NQR from NMR?
04
Q.6
The compound FeSO4∙7H2O shows quadrupole split Mössbauer spectrum while FeCl3 shows a single line, Explain the behavior.
05
Calculate the ESR frequency of an unpaired electron in a magnetic field of 0.35T. (Given, g h 6.627 x 10-34 Js and β=9.274 x 10−24 JT−1).
05
Give the applications of neutron diffraction technique.
04
Q.7
Write a note on any Three of the following.
14
ENDOR and ELDOR in ESR spectroscopy.
Reflection and refraction of X-ray radiations in crystal
Thermogram of mixture of MgC2O4∙2H2O and MgO
Effect of magnetic filed in Mössbauer spectra.