M.Sc. (Semester III) (CBCS) Examination Mar/Apr-2018
Inorganic Chemistry
INORGANIC CHEMICAL SPECTROSCOPY
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all Five questions. Section I is compulsory. Attempt any two questions from section II any two questions from section III. Answers to all Sections II and III) should be written in one and same answer book. All questions carry equal marks. Figures to the right indicate full marks. Use of log table and calculator is allowed.
Section I
Q.1
Answers the following:
14
Which is the best detector used on photoacoustic spectroscopy
Why C12 do not exhibit NMR spectra?
Among HCI,CI2 and C2H4, which is the microwave active species?
Why water cannot be used as a solvent in IR spectroscopy?
What is the ground state term symbol for Mn2+ ion?
Which are the following transitions are allowed transitions?
g→g, u→u, g→u and u→g
To which point group does the allene molecule belongs?
Write the selection rule for pure rotational Raman transitions of diatomic and other linear polyatomic molecules.
Give the total number of operations for Icosahedrons.
Write down the symmetry point group of ammonia?
Which of the following molecule do not show the IR spectrum, why?
HCl,CH4,CO2 and H2
How many modes of vibrations occur in water molecule?
What are the radiation sources used in photoelectron spectroscopy?
What is the value of spin number of H1?
Section II
Q.2
Explain the effect of isotopic substitution in microwave spectrum.
07
Explain the principle and instrumentation of Auger electron spectroscopy.
07
Q.3
Explain the occurrence of stokes and antistoke lines in Raman spectrum of molecule.
07
Draw the Orgel diagram for d2 configuration in both octahedral and tetrahedral environments. On the basis of these diagrams, predict the nature of electronic absorption spectra of complex ion.
07
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SLR-UF-247
Q.4
Explain the local and remote effects in NMR spectroscopy.
07
Construct and explain the character table for C2v point group.
07
Section III
Q.5
Explain the Morse potential energy diagram.
05
Discuss the difference between IR and Raman spectroscopy.
05
The force constant of the bond in CO molecule is 187 N/m and its reduced mass is 1.14 ×10−26 kg. Compute the frequency of vibration of CO molecule and spacing between the vibrational energy levels. h=6.63×10−34 J.s
04
Q.6
Distinguish between proper and improper axis of symmetry with example.
05
With suitable examples, describe the applications of NMR in structural inorganic chemistry.
05
Explain the Stark Effect.
04
Q.7
Write short notes on any Three:
14
Principle of photoacoustic spectroscopy
Spin-spin splitting in NMR
Charge transfer spectra with suitable example
Classification of molecules in point groups