Section-A
1. Answer all the 'five 'parts below: Answers to
be 'brief and' to the point: 8x5=40
Chromium in a 'sample can be quantitatively estimated by 'converting it into sodium dichromate",and' titrating the acidified solution with a standard solution of ferrous sulfate. Write down the stoichiometrically balanced equation for ,the reaCtion.

The quantum efficiency of H 2 -Cl 2· reaction is 10 4-10 6 but that of H 2 -Br2 reaction is only- 0·0 1 even though the mechanism is the. same. The H 2 2 reaction does not occur photochemically. Explain giving reasons.
Discuss the effect of temperature on rate of reaction. It is observed that for the reaction
2N0+0 2 2
Rate 2 2].
The rate of this reaction decreases with. increase of temperature. Explain giving the mechanism of reaction.
Which oxide is most acidiCc and why?
Cl 2 Cl 2 0 3 Cl 2 0 5 and Cl 2 0 7
The bond in_ AB is estimated to be 15% ionic and the A-B bond distance is 1· 76 A. What is the dipole. moment AB?

2. What is the difference between a fuel cell and a battery? Describe the mechanism of electricity generation in-
proton exchange membrane fuel cell (PEMFC) usmg protonconducting polymer membrane as the electrolyte;
solid oxide fuel cell (SOFC) using yttria-stabilized zirconia as the electrolyte. 20

What are ion-selective electrodes? 3
What is meant by glass electrode? Draw its labelled diagnuri and give the corresponding electrode reactions. What is it generally used for? 12
The pressure of a real gas is less than that of an ideal gas. Give reason(s). 5

3. What will be the pH of an aqueous solution containing an equimolal concentration of oxalic acid and NaOH? 10
With the help of an appropriate diagram, discuss the structure of electrode/electrolyte interface. 10
Explain the phase diagram for the Na 2 S04 2 0 system, giving clearly the number of components, phases and degrees of freedom at each point in the system. 20

4. When 18 g of liquid water is vaporized at 100 •c at 1·00 atm, how much work. is done?
Data provided are
6.Hvap(H20) =9· 7 kcal mol-l
6.Hrus(H20) kcal mol-l
R=0·0820 litre atm mol-l deg-1
1· 99 cal mol- 1 deg- 1
D[H20(1)]=1·00gcm-3 15
How many cr- and 1t-bonds are there in
the tetracyanoethylene? 10
What type of hybridization does the
sulphur atom adopt in sulphur hexafluoride?
Z Z 16) 10
Calculate the potential of the following
cell and write down the cell reaction
Fe (0·004 MJIICd 2+(0·001
Given
0
E I F 0 · 441 Fe e
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Section-B
5. Answer all the five parts below. Answers to
be ·brief and to the point :· 8x5=40
Briefly describe the various kinds of
crystal defects.
There are carbonyl-containing metal
coordination complexes and metal
clusters. How do they differ
structurally?
What are graphenes? Are they different
from other allotropes of carbon? If so,
how?
Which of the oxides listed below cannot
act" as· a reducing agent?
N0 2 S0 2 C0 2 and Cl0 2
How many of the following have same
bond order?
H2, H2 2 and H 2
6. Tripositive lanthanide ions show
colors in the crystalline
salts. These colors are unaffected by the
alteration of the anion. Explain. 10
What is the preferred geometry for the
transition state formed during ligand
substitution reaction of a. square planar
complex?
Indicate with diagram the position of
the trans, the leaving and the entering
group in the transition. state. What
influence does the trans group have on
the rate of the reaction? 10
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What are 2"electr.on 3-centered bonds?
Explain with an example.
Give the mechanism for an enzyme,
catalyzed reaction and derive the .rate
expression. What are the MlchaelisMenten
constant and the MichaellsMenten
equation?
7. What are the mam assumptions on
which an equation for adsorption
isotherm was derived by :Langmuir and
what are its drawbacks? Derive the
expression and .explain how the
equation accounts for adsorption at
5
15
high pressure and low pressure. 20
Ferredoxins, are known to
electron transfer agents. What
correct .structure of ferredoxin?
act ·as
IS the
Explain, with examples, the mechanism
for the Na fK+ pump responsible for
maintaining appropriate concentration
8
of Na and in the cells. 12
8. A defmite amount of BaC1 2 was
·dissolved in aqueous HCl solution of
unknown concentration. 20 ml of this
solution was treated with 21·4 ml of
Nf 10 NaOH for the complete
neutralization. Further 20 ml of this
solution was added to 50 m1 of
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10 Na 2 C0 3 and the precipitate was
fJ.ltered off. The filtrate reacted with
10·5 ml of 0·08 N H 2 S04 (phenolphthalein
was used as an indicator).
Find the strength of BaC1 2 and HCl
solution.
Explain Heisenberg's uncertainty
principle. Give the Schrodinger equation
for the system of a particle in a onedimensional
box. Derive an expression
for the wave function and energy of the
20
system. 5+10=15
Differentiate between nucleophilicity
and basicity. 5

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