Invigilators Signature
ENTRANCE EXAMINATION -2012
M. Se. Chemistry
TIME: 2 HOURS MAXIMUM MARKS: 100
HALL TICKET NUMBER:


INSTRUCTIONS
1.
Write your HALL TICKET NUMBER in the space provided above and also in the OMR ANSWER SHEET given to you.

2.
Make sure that pages numbered from 1 -21 are present (excluding pages assigned for rough


work).

3.
There are 100 questions in this paper. All questions carry equal marks.

4.
There is negative marking. Each wrong answer carries -0.33 mark.

5.
Answers are to be marked on the OMR answer sheet following the instructions providedthere upon.

6.
Hand over both the question paper booklet and OMR answer sheet at the end of the examination.

7.
In case of a tie, the marks obtained in the first 25 questions (PART will be used to determine the order ofmerit.

8.
No additional sheets will be provided. Rough work can be done in the space provided at the end ofthe booklet.

9.
Calculators are allowed.

10.
Useful constants are provided on top of PART A in the question paper.


1
i-to

Useful Constants:
Rydberg constant 109737 cm Faraday constant 96500 Planck constant 6.625 x 10-34 J Speedoflight=2.998x108m S·l;Boltzmannconstant =1.380x10-23JK-J;Gasconstant =8.314J K-1morl; Mass ofelectron =9.109 x 10-31 kg; Mass ofproton 1.672 x 10-21 kg; Charge ofelectron . 1.6 x 10-19 1 D =3.336 x 10-30 Cm; 1 bar 105 RT/F 0.059 V.

PART-A
1. Cell membranes are made up of

proteins and carbohydrates proteins and nucleic acids


lipids and proteins lipids and nucleic acids


2. The radiation with the highest energy among the following is

X-rays mIcrowave


ultraviolet gamma rays


3. Which ofthe following compounds is used in tear gas?

Benzene hexachloride DDT


Chloropicrine Chloretone


4. Which among the following is not a colloid?

Blood Latex


Ghee Butter


5. An octahedron has

8 faces, 12 edges and 6 vertices 6 faces, 8 edges and 12 vertices


6 faces, 8 edges and 12 vertices 8 faces, 12 edges and 8 vertices




i-to

6. The number ofcommon points on the two curves x2 4y2 5 and 4x2 y2 =5"are

7. Saccharin is an imide of









8. Which ofthe following polymer is used to make bullet proof fiber?
PMMA Lexan Nomex Kevlar
9. When one adds dilute AgN03 solution to another solution containing equal concentration of Cr, and which is precipitated most?
AgCI AgBr AgI All together
10. The enzyme nitrogenase is associated with

manganese magneSIum


molybdenum mercury


11. For the hydrogen atom, which electronic transition would result in the emission ofa photon with the highest energy?

4p-;.2s 3p-;.6d


5f-;.3d 3p



12. Which ofthe following compounds, present in urine, is detected by Benedict's method?

Urea



Steroid

Glucose


Amino acids
13. Theangle ofintersection(inradian) ofthecurves 2x2 20 and XZ is
0 1t/4 1t/2
1t
14. The diagonally adjacent element to beryllium, that exhibits properties·similar to beryllium
is

Magnesium



Boron

Aluminum


Lithium
15. When a coin is tossed 5 times, the probability of getting 3 heads and 2 tails in any order is

5/16



7/16

1/2


9/16
16. The radiation responsible for heating in the "Green House Effect" is

Ultraviolet rays


Infrared rays

Cosmic rays

Visible light
17. Which one of the following compounds will have the highest boiling point?

n-Butane


n-Butyraldehyde

2-Butanone

n-Butanol
4


18. sin4 -cos4
sin 28

cos28
-cos 28
sin 28 cos 28
19. Arrhenius equation is given by:
In k =In A +EalRT Ink InA -EaiRT

k=A· Ea/RT A. eEalRT

20. The most acidic isomer hydrocarbon among the following is






OQ
CH3 CH2

01·

CH3 CH3

21. Which atom among the following has the highest number ofunpaired electrons in its ground state?
C
N 0 F

22. The density of elemental silver having fcc lattice with unit cell length of 4.086 A is (atomic weight ofAg

1.05 glee


10.5 glce

5.01 glee

15.0 glee


23. For a particular orbital, as one goes away from the nucleus along the z-axis, the probability
density decreases to zero, then increases, and finally decreases without increasing a second time. This is consistent with a

3px orbital. 2sorbital.


2pz orbital. 3s orbital.


24. Consider a crystal with a simple cubic lattice. If on heating, the unit cell volume increases
by isotropically (equally in all directions), the percentage increase in the interplanar distance is:
1.64 1.67
2.50 5.00
25. The carrier of genetic information in organisms is

proteins RNA


nucleic acids DNA





PART-B


26. Among the following, the most unstable molecule is
Lh Bez B2


27. Hydrogen peroxide decomposes to water and oxygen according to the reaction below:
2 H202(aq) 2 H20 In the presence oflarge excess ofr ion, the following set ofdata is obtained. What is the average rate ofdisappearance ofH202(aq) in Mis in the first 15.0 seconds ofthe reaction if 1.00L ofH20 2 reacts at 25°C and 1 atm pressure?
Time, s collected, ml
0.0 0.0
45.0 2.00
90.0 4.00
135.0 6.00

9.09xlO-7M1s 1.64xl0-4M/s
4.33x 10-sMis 3.63xlO-6M1s
28. A chiral molecule among the following is















29. IftheH-N-Hangle inNH3is1070, the angle between the direction ofthe lone pair of electron (pyramidal axis) and the N bond is
107.00 109.30 110.00 111.80
30. Identify the unicellular organism(s) among the following earth worm bacteria
hydra yeast:

iii

ii 11, 111 ii, iv
31. Correct order ofbasicity is
NH3 NMe3 NF3
NF3<NMe3 <NH3
NH3<NF3< NMe3
NF3< NH3<NMe3

32. Chlorine reacts with chloroform according to the reaction given below: Ch CHCh CCl4 +HCI
When the initial concentration ofCh is doubled the reaction rate increases by factor of 1.41. What is the order ofreaction with respect to Ch?
2 1/2
-1

33. Which ofthe following compounds will not react through SNI mechanism?
CH3



H3CkcI £bcl
CH3


4J
CI CI
8




34. If the function f AeiB where A is a constant, and then
.

0


fee)
35. Viruses are made up of: proteins only protein and DNA protein and RNA DNA and RNA
ii ii,iii

Ill, IV 11, IV
36. 10 ml of 0.10 M sodium carbonate is added to 20 ml 0.10 M sulphuric acid and the
resultant solution is titrated against 0.10 M sodium hydroxide. What will be the titre value at the end point?
5ml 10 ml

20ml 30 ml
37. If Kc equals to 0.11 at 25°C for the reaction: N204(g) 2N02 what is Kc for the reaction: N02(g) N20
4.5 0.33

3.0 9.1
38. The vinyl chloride does not react with NaOH through SN2 mechanism because

hydroxide is too weak as a nucleophile.


the sp2 C-CI bond is stronger than a Sp3 C-CI bond.


the hydrogen atom trans to the chlorine atom sterically inhibits the substitution reaction.


chlorine atom is not a good leaving group.


9



39. In the DNA double helix, the base complementarity is governed by

electrostatic forces



hydrophobic interaction

hydrogen bonding


van der Waals' forces
40. The reagent that can be used to precipitate Ba2+ from an aqueous solution is

hydrochloric acid


. sulfuric acid

silver nitrate

ammonium chloride

41. At a certain temperature, the equilibrium constant, Kc equals 0.11 for the reaction: 2 Ch(g).
What is the equilibrium concentration ofICI if 0.75 mol ofI2and 0.75 mol ofCh are initially mixed in a 2.0 L flask?
0.28 molslL 0.22 mols/L 0.45 mols/L 0.56 molslL

42. Identify the product with molecular formula, ClsHl602 formed when phenol reacts with acetone in the presence ofconc. H2S04•












43. Consider the following vectors:
X 3j+4k; Y Zk; Z Zf-41+ Zk. Which of the following vectors are orthogonal?
Xand Y Xandi Yand i eX andi

10





44. Equation to the tangent to the curve)' x3 -2x2 at is

x



4x

x 4


4x
45. Which compound among the following can act as Lewis acid as well as a Lewis base?

SnCh


46. What is the standard cell potential for the reaction below?

The standard reduction potential is -2.37 V for the Mg2+/Mg half-cell and +l.09V for the Br2/Br-half-cell.
1.28V . -1.28V

3.46V
-3.46V

47.
Identify the strongest nucleophile from the following.


0
N
6
N
Sr

COOCHa
66N
N

48. The arc length ofthe curve y x3/2 from x 0 to 5 is

27/
27 533
11

49. Which one among the following is an example of"sandwich" compound?





•

50. hnlx..... +00

1
In:x

x
0

51. Based on the following information, 2Mg EO=-2.37V


which ofthe following chemical species is the strongest reducing agent?

Mg2+


Mg
0

52. Heating the triene

promotes the intramolecular cycloaddition reaction to furnish:














HW H(D

12


i-lo

53.
The hybridization ofthe metal centre in

54.
The polar coordinates ofthe point ..J3) is




55. Theabsorption oflightoffrequency1.16x1011 Hz is required for CO molecules to go from the lowest rotational energy level to the next higher rotational energy level. Determine the energy for this transition in kJ/moi. (h=6.626xlO-34 Js)
949 kJ/mol 0.0463 kJ/mol 46.3 kJ/mol 7.69xl0·23 kJ/mol
56. A typical sample (S)-lactic acid shows optical rotation +12.1 0. The optical
rotation of pure (R)-lactic acid is -13.5°. The percentage ofR S lactic acid present in the sample is

R=81,S=19 R S 10


10, S=90 R 95, S 5


57. Identify the most appropriate reaction which involves one C-C and one C-O bond formation

Knoevenagel Darzens condensation


Michael reaction Shapiro reaction


58. Magnitude ofthe area enclosed by the curve, x 2 and the x-axis is
1 1/3 1/6 0

59. The organometallic compound that obeys the 18-electron rule among the following is

s-CsHs)Cr(CO)J]


[CO(l1s-CSHS)2]


60. KCI crystallizes in a cubic unit cell with cr ions at each vertex and face centre. How many ions and cr ions are there in each unit cell ofKCI?

1K+ionand1 crion 8K+ionsand8 crions


4 ions and 4 cr ions 2 ions and 2 cr ions


61. Which of the following information will be necessary to calculate the change in entropy of a reversible process?

Pressure Volume


Internal energy Temperature


62. Identify the most appropriate chiral molecule which may be resolvable:





CI



OSoCI


63. Consideranarray of1mol ofHatoms. Ifeachatomcouldbeinone ofthetwospinstates
the number ofpossible spin distributions for the collection ofH atoms is Avogadro number)
2N

2N N/2
14



64. The crystal field stabilization energy ofTi(III) in octahedral field is more than the crystal field stabilization energy ofTi(III) in tetrahedral field. The difference is
1.33 Dqo 2.67 Dqo


6 Dqo
65. Ifthespin-onlymagneticmoment ofthebrownringcompound[Fe(H20)s(NO)]S04is
3.90 then the oxidation state ofiron is


+3
66. Which ofthe following solvents is not suitable for a Grignard reaction?

Tetrahydrofuran Diethyl ether


Acetonitrile Hexane


67. Given four different dyes R and how many different dye combinations (containing at least two types) can be generated?
4
11
68. Inthermodynamics,apropertyiscalledextensive ifitsvalueisadditive.Which ofthe following is not an extensive property?
Mass Volume Heat capacity Specific heat
69. Theradiationintensity ofasample ofradioactiveNa(halflife= 15h)willbecomeone­tenth of its original intensity in
15h 30h 50h 75h



70. Which one ofthe following is the major constituent ofpetrol?






-ty
71. f1C xcosxdx
-rr

- 0.51t 0 0.5 1t 21t
72. For combustion of benzene in a sealed container having rigid thermally conducting walls that is immersed in a water bath at 25°C

w q 0



w q LU

w q 0



73. The number ofnodal planes present in s antibonding orbital is
0 2 1
74. The preferred method to separate 2-and 4-nitrophenol is

sublimation



fractional distillation

steam distillation filtration

75. For the cell, Cu I CUS04 (O.lmol/kg) II Hg2S04 I Hg I Cu, the cell reaction among the following is:

Cu 2Hg


Hg CUS04 Hg2 Cu


CUS04 +Hg2S04 2Hg+ Cu2+ 2soi­


Cu 2Hg




76. To what pressure must a sample of gas be subjected at constant temperature in order to
compress it from 122 ml to 105 ml if its original pressure is 1.71 atm?

1.99 atm 2.2 atm

3 atm 0.99 atm
77. The number ofdouble bonds in C30Z, satisfying the normal valencies ofthe
elements, is

3 4 1
78. Which one ofthe following alcohols will give ketone with Fenton's reagent?
Methanol Ethanol Isobutanol 2-Butanol
79. The function, that has both an upper bound and a lower bound over its complete domain among the following is
2

x -y2 Xl
x2 -y2 x2 -4y

80. How many moles ofNaCI are produced by the reaction of0.750 mol Ch (with
1.50 mol 0.375 mol 0.750 mol None
81. Among the following, the crystal lattice with the largest packing fraction is

simple cubic body centred cubic


face centred cubic simple tetragonal


82. The isomer which has highest heat of combustion among the following isomers (molecular formula C6H1z) is

1,I,2-trimethylcyclopropane cyclohexane


methylcyclopentane ethylcyclobutane





83. The periodicity ofthe function tanx is
1t

21t 31t 41t
84. Onadditionofasurfactant,thesurfacetension ofwater

increases



remains unchanged

decreases


becomes temperature independent
85. 40.00 ml of0.11 M HCI is diluted to 100 ml with water and then titrated with 0.1 M
NaOH. The pH ofthe resulting solution after addition of 10 ml titrant is

12.49

1.51 0.11
0.21
86. Among the four isomers ofC7H7CI, which one will have weakest carbon-halogen bond?

2-Chlorotoluene



3-Chlorotoluene

4-Chlorotoluene


Benzyl chloride
87. Given two sets A and each with four elements, the number ofrelations that are
possible between A and B in which every element in A is uniquely mapped to B and vice-versa is
24


88. Assuming that the volume ofwater does not change on dissolving NaCI, the density ofa
0.1 M aqueous solution ofNaCI at 25°C (atomic weight ofNa 23.0 and CI 35.5) is
0.93 glml 1.00 glml

1.01 glml 1.10 glml
18

89. Which among the following is a "superoxide"


90. Aqua regia is a powerful oxidizing agent because it contains

free 02 and ChO


free Ch and CINO



91. Rank the following in order ofdecreasing rate ofreaction with ethoxide ion in a
nucleophilic aromatic substitution:

Br BrBr
Br 2 2



&N02
1.0 '.0

.0 N0 .0 N0


N02 N021
2 3 4








92. 4.5 g of PCls on vaporization occupied a volume of 1700 cc at 1 atm and 227°C. The degree ofdissociationofPClsis
100% 92.1% 89.2% 50.5%
93. The function that is continuous over the complete real axis is
cothx cotx tanhx tanx



94. Which ofthe following cannot act as a ligand?
AsH3 NO+

cr
95. What is the major product obtained in the following reaction?
6 Hg(OAc)2




c5
OH




. tanx

96. -IS
"x

00 7tl2 I -00
97. Choose the correct combination of true statements from the statements given below regarding H3BNH3 and H3CCH3

the two molecules are isoelectronic, the two molecules are isostructural. both molecules have zero dipole moment, H3BNH3 is paramagnetic while H3CCH3 is diamagnetic, both may be viewed as coordination compounds


and and


and and


20



98. The IUPAC name of CH3CONBr(CI) is

N-bromo-N-chloroaceiamide N-bromo-N-chloroethanamide


1-(dimethylamino)ethane 1-(ethylamino)methane


99. Iodimetry involves

titration with standard iodine solution


iodine as a reducing agent



production ofiodine from excess iodide by analyte


precipitation of iodine for gravimetric estimation


100. Phenyl isocyanide is prepared by

Stephens reaction carbylamine reaction


Reimer-Tiemann reaction Wurtz reaction