1.

Lithium does not occur with sodium
and potassium though nu belong to
group 1. Explain.



How does bond order change in the
cases 02 to 02 and {iiJ N2 to N2?
Show with MO diagram.



Why HF is a strong acid in liquid
ammonia but is a weak acid in water?


Consider the following reaction

3ClO- 2C1- ClO3


Name the type of such reactions and
give name and example of the reverse
type.




Which of the two ions Fe(II) and Cr(III)
would be easily oxidized?


Fc3 Fe2+ +0·77volt


Cr3+ Cr2+ 0·41 volt



E is standard reduction potential.

Explain why H2 molecule exists but
He2 does not.




Explain packing fraction.




Explain briefly geometrical isomerism.

Draw the structures of various

geometrical isomers of the following
complexes






t(NO2)(C5H5N)(NH3)(NH2OH


Identify the ground term symbol of set

of terms l 3F 3 l F . specify the
spin and angular momenta of

ground state and also the possible total

angular momentum value.



In which of the following, the EAN rule
is not followed? Explain


Co2


V(CO)6






2 Explain briefly the liquid-drop model of
a nucleus. Show that usually U is an

α-emitter and not a β-emitter.


Explain the concept of VSEPR theory
and illustrate its efficacy in predicting
gross geometrical structures of BeF2,
NH3 and CC14






3 .
Write down all the term symbols for
d^2-configuration. Identify the term
symbol for ground state and show
symbol for ground state and show
how it is split up by spin orbit coupling.
how it is split up by spin-orbit coupling.

Explain 'mass defect" and 'binding

energy'. How are they related?


Explain the structure of Cu(II) acetate
dihydrate.




4 . Show diagrammatically the crystal field
splitting of d-orbitals in octahedral and

tetrahedral environment. Show that


Δtd (4/9)Δoct



The log k value of Cr-EDTA complex is
23·O, still Cr(III)cannot be titrated with
EDTA directly. Explain.



Explain the structure and bonding in

Fe3(CO)9.



5 . What is diagonal relationship in the
periodic table? Discuss with reference
to lithium, magnesium, beryllium and
aluminium.



Explain why the magnetic moment of Gd3 complexes can be
obtained by spin only formula but not of


Tb3+(Z 65 complexes.



Discuss the bonding of CO in metal

carbonyls. Find EAN of metal atoms in

Ni(CO)4 and Fe(CO)5. Also give their
structures.










6. Explain briefly tetragonal distortion of
octahedral complexes. in which of the

following complexes, it is observed?

Co(II) in


strong field, and

Mn(III) in weak field


Explain the Lewis concept of acids and
bases.



W hat is pKa value of a weak acid, How

is it related to its pH? Explain.



7.
Differentiate between thermodynamic
and stoichiometric stabilitY constant.

Under which condition the two will be

identical?


Calculate the magnetic moment of e

and [MnBr4]2-.


Write down a brief note on peroxy acids.







8 What are fluorocarbons? Give their
method of preparation, properties and

commercial applications.



Explain which of the following has the
shortest bond leng1h



NO, NO+


Write the structure of diborane.



9 . Explain the structures of different types
of silicates.



Balance the following ionic reaction by
'ion electron' method in acidic medium



Cr2O7^2— Cr3+




Write down the ionic oxidation reaction
for the Liberation of iodine from

potassium iodide in acidic medium by

potassium dichromate.




10. Name all the elements belonging to
group 14 and comment on the group

trend in properties in respect or-


metallic character;


chemical reactivity;

stability of tetrahalides;


basicity of oxides.



Explain the configuration and oxidation
states of lanthanides•.





How is Cu2+ estimated iodometrically?
Explain the reactions involved.



11. Comment on the following



SnCl2 dissolves in HC1 but not in
ammonia.


CO2 is a molecular gas but S i0 2 is
a solid.



SnCl2 shows reducing behaviour.

PbC12 does not.



How are nuclear radiations detected
and measured? Discuss enc method.
and measured? Discuss one method.