A-JGPT-M-BGDL-A


PAPER-I
CONVENTIONAL)
ITime Allowed Three Hours IIMaximum Marks 200 I

QUESTION PAPER SPECIFIC INSTRUCTIONS
Please read each of the following instructions carefully before attempting questions
There are EIGHT questions in all out of which FIVE are to be attempted.
Question Nos. 1 and 5 are compulsory. Out of the remaining SIX questions, THREE are to be attempted selecting at least ONE question from each of the two Sections A and B.
Attempts of questions shall be counted in chronological order. Unless struck off, attempt of a question shall be counted even if attempted partly. Any page or portion of the page left blank in the Question-cum-Answer Booklet must be clearly struck off.
All questions carry equal marks. The number of marks carried by a question/part is
indicated against it.
Answers must be written in ENGLISH only.
Unless otherwise mentioned, symbols and notations have their usual standard meanings.
Assume suitable data, if necessary and indicate the same clearly.
Neat sketches may be drawn, wherever required.

1 [P.T.a.
SECTION-A
1. Answer all the questions 8x5=40
Draw the molecular orbital diagram of the following species and comment on
their bond energy, bond length and magnetic behaviour: 8
<img src='./qimages/1205-1a.jpg'>

Draw the shapes of d-orbitals. 8
(c)What is meant by extinction coefficient in crystallography? How is it useful in
distinguishing the various types of cubic lattices? 8

(d)Describe the critical phenomenon observed in a gas using appropriate
example. Explain its applications in liquefaction of gases. 8

(e)What is hybridization? Discuss the hybridization of xenon in XeF4. 8

Discuss the significance of each of four quantum numbers. Derive the possible
set of four quantum numbers when n=2. 20

(b)Derive Clausius-Clapeyron equation for a system consisting of liquid in
equilibrium with vapour. Give its applications. 20

What is first-order reaction? Derive a kinetic expression for the first-order
reaction to show that the time required to complete a definite fraction of the
reaction is independent of the initial concentration. 20

the thermal decomposition of gaseous acetaldehyde, decomposed quantity
x-is represented by delta the pressure increase in a closed vessel. The following
results were obtained
Time(sec) 42 242 480
delta 34 134 194
The initial pressure of acetaldehyde in this vessel was 363 mm. Show that the
reaction is of second order. 10

(c)Discuss in brief the difference between bonding and anti-bonding molecular
orbitals. 10

Discuss the phase rule applicable to lead-silver system. Explain the application
of this system for desilverization of lead. 20
(b)Describe the potentio metric determination of pH of a solution using glass
electrode. 20



SECTION-B'
5. Answer all the questions: 8x 5=40
(a)Why is the chemistry of the lanthanides homogeneous whereas there are erratic and irregular variations
in chemical properties in series of d-block elements? 8

(b)What happens when the following substances are treated with liquid NH3? 8

Zn(NO3)2
Hg2Cl2
(iii)KMnO4
(iv)TiCl4
(c)Describe the preparation of sodium nitroprusside explaining the intermediate substances
formed and balance all the chemical reactions. 8

(d)Explain effective atomic number rule with appropriate example. Show that some complexes are exception
to this rule with appropriate example. 8

(e)Explain why Ce3+ ion (4f universe) is colourless, whereas Ti3+ solution is purple in colour. 8

6.Discuss the influence of ionic strength on the rate of ionic reaction utilizing Debye-Huckel limiting law.
Show that the rate constant is independent of ionic strength if one of the reactants is neutral molecule. 40

Draw the possible structures of Fe2(CO)9 with special reference to magnetic and crystallographic studies.
Discuss hybridization involved and give the difference between hybridization and resonance. 20

(b)Explain fluorescence and phosphorescence using the Jablonski diagram. 20

Give a succinct account of the transport of molecular/ionic species through a charged semipermeable membrane. 20
(b)Explain the following terms with suitable example (at least one in each case) 20
(i)Complex
(ii)Chelate
Stability
(iv)Stability constant
(v)Overall stability of a complex
(vi)Steric effect
Dentate character
(viii)Chelate effect