University of Lucknow 2007-1st Sem M.Sc Chemistry --lko university - Question Paper

M.Sc(semester-1}EXAMINATION
DECEMBER,2007
INORGANIC CHEMISTRY

Time allowed:3 hrs,max marks-100


note:answer any five ques. including ques no.1 which is compulsory.ques.no.1 is of 40 marks and rest of 15 ,marks.


1.attempt the following:

a)Why absorption intensities are very weak in case of high spin d5 complexes.
b)the bond angle ONO reduces along the series NO2-,NO2+,NO2.
c)Explain the symmetry point group of[FeCl2]2- and [CuCl2]2-.
d)show the splliting of F term arisingout due to configurationof metals ion under weak magnetic field.
e)explain using MO theory,each boron atom h three valancy,yet it is not held by a triple bond as in N2.
f)what is a cyclic grp?shw the cyclic grp that is abelian.
g)which of the two states 3P,3F of d2 free ion has more energy?
h)what modifications in bond length leads to decrease symmetry frm octahedral to tetrahedral?
i)predict the shape of ICl2-using VSEPR theory.
j)derive the ground term symbol for d3 and d10 configurations of free metal ions.


2.
(a)explain the character table to which NH2 molecule belongs?
(b)write about the mathematical group n show A B C to make set (E,A,B,C)nsuggest a mathematical group whre E is identity element.

3.what are the essentil conditoins for the combination of atomic orbitals to form molecular orbitals?draw MO diagram for a tetrahedral complex.

4.write short note onany two:
(a)Bent rule
(b)d-pie-p-pie bonds
(c)Walsh diagram for penta atomic molecules.
(d)main features of VSEPR theory.

5.
(a)discuss electronic spectra of [Ti(H2O)6]3-.What will be the change in spectra if the ligand is changed by CN-?
(B)draw a combined orgel diagram for d1,d4 octahedral and tetrahedral complexex.

6.what areiso and hetro polyacids.discuss Keggins theory for str of heteropolyacid.

7.describe any two:
(a)spin crossovers
(b)charge transfer spectra.
(c)structure of inter halogens on basis of VSEPR theory.

8.what is the charachter table for a point group?give uses.construct character table for C2v point grp.

9.discuss the spin selection and Laporte selection rules of electron absoption spectroscopy.under what condition these rules are relaxed?

Earning:   Approval pending.