M.Sc.(Semester IV) (CBCS) Examination Mar/Apr-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 any two from Section-III Answer to all questions (Section II and III) should be written in one answer book. All question carry equal marks. Figures to the right indicate full marks. Use of log table and calculator is allowed.
Section I
Q.1
Answer the following.
14
What is Mössbauer spectrum?
Name is main components in instrumentation of X-ray spectroscopy.
Which reference material is used in DSC?
Which source is used in ESR spectrometer?
Name X-ray diffraction methods used for investigating the internal structure of compounds?
What are the peaks observed in DTA curve?
What is the source of radiations generally used in Mössbauer spectroscopy?
In which region of electromagnetic spectrum, transition between NQR levels observed?
Name the factors affecting DSC curves.
What is the use of thermally insulated Dewar flask in thermometric titrations?
What is the relation of isomer shift with s-electron density of Mössbauer nuclei?
What is hyperfine splitting in ESR?
What is Doppler broadening?
What is the wavelength of X-rays when produce using Cu target?
Section II
Q.2
Discuss the theory of X-ray diffraction, giving a schematic diagram of instrumentation involved.
07
What is thermal analysis? Describe the principle and working of TGA.
07
Q.3
Explain the splitting of NQR spectra in nucleus having spin I=1 and I=2 and show the observed NQR transitions.
07
Explain quadrupole splitting and hyperfine interaction in Mössbauer spectroscopy with suitable example.
07
Q.4
Explain the principle and application of neutron diffraction technique.
07
Explain the factors affecting the magnitude of g value in ESR spectrum.
07
Page 2 of 2
SLR-UF-256
Section III
Q.5
What is mean by thermo mechanical analysis Give a schematic representation of thermo mechanical analyzer.
05
A first order reflection from planes of a cubic crystal observed at glancing angle 11.2° using radiation. Calculate the length of the side of unit cell.
05
What are the essential characteristics which a nuclide should have for exhibiting Mössbauer effect?
04
Q.6
Explain the use of Mössbauer spectroscopy in the determination of bonding in iron complexes.
05
Calculate the ESR frequency of an unpaired electron in a magnetic field of 0.35T. (Given, g=2,h=6.627×10−34 Js and β=9.274×10−24 JT−1)
05
What are the difference between DTA and DSC?
04
Q.7
Write a note on any THREE of the following.
14
Thermogram of mixture of MgC2O4∙2H2O and MgO
Applications of X-ray diffraction
Mössbauer effect
Allocations of NQR spectroscopy