M.Sc. (Semester III) Examination Nov/Dec-2018
Analytical Chemistry
ANALYTICAL SPECTROSCOPY
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Draw neat and labeled diagram and give equations wherever necessary.
All questions carry equal marks.
Figures to the right indicate full marks.
Use of logarithmic table and calculator is allowed.
Q.1 Multiple choice questions 14
The molecule will be Raman active only when its polarizability changes with
the mode.
rotational translation
vibrational electronic
The number of Zeman levels in the nucleus are given by
I I 1
I 1 2I 1
Analysis of surfaces can be achieved by
ESCA NQR
ESR NMR
is the system which will not show ESR spectrum.
N2 NO
CH3 H2
The intensity of Raman band is proportional to square of change in
dipole moment polarizability
magnetic moment energy
The isomer shift is generally decreases with in s-electron density.
high increase
decrease constant
The element which does not produce Auger electron spectra is
Helium Nitrogen
Halogens Carbon
ESR spectra fall in the region of
Radiowave Far IR
X-rays Microwave
Raman lines on the low frequency side of excitation frequency are called

Stokes line Anti stokes line
Rayleigh line Frequency line
10) The region in which NQR spectra are observed is region.
IR Microwave
Radiofrequency Visible
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SLR-VW-51
11) Photoacoustic spectroscopy is also called spectroscopy.
Optoacoustic Photovoltaic
Microscopic Macroscopic
12) In scanning electron microscope electrons are used for
imaging the samples.
primary secondary
ternary basic
13) Raman spectroscopic measurement is usually carried in the range
10-200nm 200-400nm
700-800nm 400-700nm
14) is a piezoelectric transducer used as a detector in PAS.
SbZrO2 PbO
PbZrO2 SnO2
Q.2 Answer the following (any four) 08
Give any two points which differentiate the Raman spectroscopy from IR
spectroscopy.
What is quadrupole moment in NQR spectroscopy?
What is photoelectron spectrum?
Name the best known free radical used in calibration ESR spectra. Write
its structure.
Name the source preferred in SEM technique. What information is
obtained from SEM?
Write notes on (any two) 06
Applications of Resonance Raman Spectroscopy
Limitations of ESCA
Hyperfine structure in the ESR spectrum of hydrogen atom.
Q.3 Answer the following (any two) 08
Discuss in brief resonance Raman effect.
Explain only principle of Mössbauer spectroscopy.
Give the chemical applications of Photoacoustic Spectroscopy (PAS).
Answer the following (any one) 06
Describe the relation of Electric Field Gradient with the molecular
structure of the compounds.
Explain the working of Scanning Tunneling Microscopy.
Q.4 Answer the following (any two) 10
Discuss principle of Raman spectroscopy.
Explain the instrumentation of photo electron spectroscopy.
Describe in brief Atomic Force Microscopy.
Answer the following (any one) 04
The observed Mössbauer spectrum of Fe3(CO)12 consist of three lines of
equal intensity with central line slightly broader than other two. Elucidate
the molecular structure of compound.
Calculate the ESR frequency f an unpaired electron in a magnetic field
of 0.35T. (Given, g h 6.627 x 10-34 Js and 9.274 x 10-24 JT-1).
Q.5 Answer the following (any two) 14
Discuss the quantum mechanical theory of Raman effect.
Explain the splitting of NQR spectra in nucleus having spin I 1 and I 2
and show the observed NQR transitions.
Discuss the basic principle and instrumentation of PAS.