7. What are liquid crystals Explain their characteristics. 10

Explain the collision theory of biomolecular reactions. What are the limitations of this theory 15


Derive the Gibbs-Helmholtz equation and explain the terms involved. 15


Explain the theory of absolute reaction rates. 10


8. Explain the Debye-Huckel theory of strong electrolytes. 15

Discuss the magnetic property and complex formation of lanthanides 10


State and explain the third law of thermodynamics. 15


Explain the concept of chemical potential. 10


9. Explain the application of e.m.f. measurements of fuel cells. 20

Explain the reactions in liquid SO2 with respect to


acid-base reaction,


solvolytic reaction and


complex formation reactions. 15


Calculate the number of moles of HCl(g) produced by the absorption of one joule of radiant energy of wavelength 480 nm in the reaction, Cl2(g) .


if the Quantum yield of the photo-chemical reaction is 1.0×106. 15
EFG-45562 4 400

Total No. of Printed Pages 4 Roll No. ............................

1(CCE.M)2

Chemistry—I




Time Three Hours] [Maximum Marks 300
INSTRUCTIONS

Answers must be written in English.


The number of marks carried by each question is indicated at the end of the question.


The answer to each question or part thereof should begin on a fresh page.

Your answer should be precise and coherent.


The part/parts of the same question must be answered together and should not be interposed between answers to other questions.


Candidates should attempt question no. 1 which is compulsory and any four out of the remaining questions.


If you encounter any typographical error, please read it as it appears in the text book.
(viii) Candidates are in their own interest advised to go through the General Instructions on the back side of the title page of the Answer Script for strict adherence.

No continuation sheets shall be provided to any candidate under any circumstances.


Candidates shall put a cross on blank pages of Answer Script.



EFG-45562 1 Contd.
No blank page be left in between answer to various
questions.
No programmable Calculator is allowed.
(xiii) No stencil (with different markings) is allowed.
1. Discuss the molecular orbital theory of Covalent compounds.
10
Explain the consequences of lanthanide contraction. 10
What is dipole moment Explain with example, how the magnitude
of dipole moment gives an idea about the structure of a molecule.
10
Explain Heisenberg's uncertainty principle and the concept of
probability. 10
Draw the shapes of p and d-orbitals. 10
Explain the limitations of Arrhenius theory of dissociation.
10
Calculate the entropy change of 1 mole of helium when it is
heated from 300 K to 600 K at constant pressure. 10
Explain the laws of photochemistry. 10
Explain Fajans rule. 10
Explain the concept of resonance and resonance energy with
suitable example. 10
2. Construct Born-Haber cycle for the formation of KCl and
explain the terms involved. 15
Explain the Quantum numbers and give their significance.
15
Discuss the splitting of d-orbitals in octahedral and tetrahedral
complexes. 20

3. Derive the relationship between Cp and C v for n moles of ideal
gas. 15
Discuss the significance of . and .2 . 10
One mole of an ideal monoatomic gas expands reversibly
from a volume of 10 dm3 and temperature 298 K to a volume
of 20 dm3 and temperature 250 K. Assuming that CV=3/2 K.
Calculate the entropy change for the process. 10
Explain colour, oxidation states and magnetic properties of
d-block elements. 15
4. Discuss the entropy change in reversible and irreversible
process. 15
Derive the rate equation for second order reaction when there
is only one reactant. Also show that t1/2 (half life) is inversely
proportional to the initial concentration. 20
What is Quantum yield How is it determined
experimentally 15
5. Describe Schrodinger wave equation. Show how the wave
equation supports Bohr's theory of hydrogen atom. 20
What are photochemical reactions Give at least five examples
for photochemical reactions. 15
Explain the separation of lanthanides by ion-exchange method.
15
6. Explain
Precipitation reactions
Acid base reactions
Complex formation reactions in liquid ammonia. 15
What are fuel cells Explain any three types of fuel cells.
15
Derive Bragg's equation. How is it used in the determination
of crystal structure 20

EFG-45562 2 Contd. EFG-45562 3 Contd.