M.Sc. (Semester III) (CBCS) Examination Nov/Dec-2018
Inorganic Chemistry
INORGANIC CHEMICAL 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 total number of operations for Icosahedrons are
110
120
130
140
The subscript or is omitted, if the point group is
noncentrosymmetric Td
centrosymmetric
octahedral
pyramidal
Raman effect is
elastic scattering of light
inelastic scattering of light
emission of light
absorption of light
NMR spectroscopy falls in the frequency region of electromagnetic spectrum.
microwave
rays
radiowave
far IR
Group in which elements obey commutative property is called group.
symmetry
asymmetry
nonabelian
abelian
transition has lowest order of energy.
n→π∗

n→σ∗
σ→σ∗
is not a microwave active species.
HCl
NO
CO
Cl2

are the radiation sources used in photoelectron spectroscopy.
N
He
C
Li
Ammonia molecule belongs to point group.
C4v
C1v
C3v
C2v
10) The energy separation of spectroscopic terms are expressed as
crossing rule
Nephalauxetic ratio
Racah parameter
multiplicity
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SLR-VF-194
11) Raman spectroscopy is based on energy changes in levels.
vibrational
electronic
transition
rotational
12) In the low resolution NMR spectrum of vinyl chloride peaks are obtained.
3
4
1
2
13) The fundamental vibrational modes of nonlinear polyatomic molecules
3n-5
3n-6
3n+5
3n-4
14) The best detector used in PAS is
condensor microphone
piezoelectric transducer
photomultiplier tube
multiplier
Q.2

Answer the following (Any four)
08
Write only three dimensional matrix representation of symmetry of matrix
Give the selection rules for Electron Absorption Spectroscopy.
What are the fundamental vibrational frequencies observed in the IR spectrum of H2O.
Give any two types of photoelectron spectroscopy.
What is molecular symmetry?

Write notes on (Any two)
06
Symmetry aspects of molecular orbitals
Applications of Microwave spectroscopy
Chemical shift and spin-spin coupling parameters in NMR spectroscopy
Q.3

Answer the following (Any two)
08
What is Ramm shift? A sample was excited by the 4358Å line of mercury. A Raman line was observed at 4447Å. Calculate the Raman shift in cm-1.
Explain Morse potential diagram.
Explain Auger effect with illustrative diagram.

Answer he following (Any one)
06
Discuss the symmetry elements and symmetry operations with example.
What do you mean by term symbol? Calculate the Term symbols for d4 and d8 case?
Q.4

Answer the following (Any two)
10
The force constant of the bond in CO molecule is 187 N/m and its reduced mass is 1.14 x 10-26 kg. Compute the frequency of vibration of CO molecule and spacing between the vibrational energy levels. (h=6.63 x 10-34J.s)
Construct the multiplication table for C2v point group.
Give the applications of PAS.

Answer the following (Any one)
04
Describe the great orthogonality theorem
Write a note on charge transfer spectra.
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SLR-VF-194
Q.5
Answer the following (Any Two)
14
a)Explain the nature of the absorption spectra of d1, d4, d6 and d9 cases using Orgel diagram for octahedral systems.
b)Explain the occurrence of stokes and antistokes line in Raman spectrum of molecule.
c)Discuss the basic principle and instrumentation of NMR spectroscopy.