KUET 2021 Question Paper M.Sc. Chemistry

FOR KUET EXAM PREPARATION

KUET 2021
Question Paper · M.Sc.
Chemistry
EXAM YEAR TYPE SUBJECT

KUET 2021 Question Paper M.Sc. Chemistry

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Sr. No. .............................

ENTRANCE TEST-2021
SCHOOL OF PHYSICAL & MATHEMATICAL SCIENCES

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CHEMISTRY
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Question Booklet Series

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Total Questions : 60
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Time Allowed : 70 Minutes Roll No. :

s e g l
g l a Instructions for Candidates :
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1. What is correct for ClF3 molecule ? 5. Match up the following acids to the basicities. Which
pairing is correct ?
(A) It has 2 axial lone pairs
(A) Phosphoric acid; dibasic
(B) It has two equatorial lone pairs
(B) Phosphinic acid; monobasic
(C) It has all fluorine’s of equal bond length
(C) Phosphonic acid; monobasic
(D) It has one axial and one equatorial lone pair
(D) Phosphorous acid is monobasic
2. Match these compounds with their right geometries ?
6. All of the following, except one, are radicals. Which
(a) Ni(CO)4 (I) Tetrahedral is diamagnetic ?
(b) ICl2– (II) Linear (A) NO 2
(c) ICl4– (III) Square Planar (B) NO
(d) FClO (IV) Bent (C) FNO
(e) FClO3 (D) NF 2
(a) (b) (c) (d) (e) 7. Find the incorrect match among the following :
(A) (III) (II) (I) (II) (III) (A) Zinc(II); Carbonic anhydrase
(B) (III) (II) (I) (III) (II) (B) Iron transport; Ferritin
(C) (I) (II) (III) (IV) (I) (C) Cadmium toxicity; Metallothoniens

(D) (I) (II) (III) (IV) (III) (D) Cytochrome 450; monooxygenase

3. Assuming the energy difference between 4s and 3d 8. On structural analogy to hydrogen peroxide,
orbitals to be small, the exchange energy for Cr as peroxosulphuric acids: Caro’s and Marshall’s can be
4s2 3d4 and 4s1 3d5 will correspond to : considered as :

(A) 6 and 15 exchanges respectively (A) Completely analogous to H2O2
(B) Caro’s as monosulphonic derivative of H2O2
(B) 15 and 10 exchanges respectively
(C) Marshall’s as monosulphonic derivative of H2O2
(C) 6 and 10 exchanges respectively
(D) Caro’s as disulphonic derivative of H2O2
(D) 10 and 15 exchanges respectively
9. Which of the following non metal systems shows
4. Which of the following sandwich compounds can be
electrical anisotropy with a possible superconductivity
a good one electron oxidizing agent ?
application around 0.26K ?
(A) Ferrocene (A) Phosphonitrilic halides
(B) Cobaltocene (B) Polyphosphazenes
(C) Manganocene (C) Polythiazyls
(D) Nickelocene (D) Polyphosphates

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10. Match the Boron compounds to their structure : 14. As a comparative property of 3d,4d and 5d transition
metals which of these is incorrect ?
(I) B7H7 2– (i) closo
(A) [MnO4]– is very strong oxidizing agent compared
(II) B9H15 (ii) nido
to [TcO4]– and [ReO4]–
(III) B6H10 (iii) arachno
(B) The metal bonding strength of group
(IV) B6H12

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8 dimers is [Mn2Cl8]2– >[Tc2Cl8] 2– >[Re2Cl8] 2–

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(I) (II) (III) (IV)

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(C) RuO4 is thermodynamically more stable than

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(A) (i) (ii) (iii) FeO4
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(i) (iii) e(ii)
l a
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la (i) (iii) follows the order Cr > Mo > Wg
(B) (D) The kinetic inertness of coordination compounds

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3+
a 3+ 3+

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(C) (iii) (ii)
15. Identify the correct match for Titrations as analytical
(D) (ii) (i) (i) (iii)
methods :
11. The soft sulphur donor ligands can stabilize which of
(I) (II)
the following uncommon transition metal oxidation
states ? (i) Xylenol orange (a) Acid Base Titration

(A) Fe2+ (ii) Methyl Orange (b) Redox Titration

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(iii) Diphenylamine (c) Complexometric
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(B) Cu +
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titrations
(C) Co 3+
(D) Cu 3+
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12. Which isotope is produced by an (n, ?) reactiongstarting (i) (ii) (iii) (iv)

from Th ?
230 (A) (c) (d) (a) (d)

(A) 229Th (B) (c) (b) (d) (a)

(B) Ac
229 (C) (d) (c) (a) (b)

(C) 231Th (D) (c) (a) (b) (d)

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(D) 231Pa 16. The volume of 0.1 M AgNO3 required for precipitation

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of chloride ions present in 30 mL of 0.01 M solution

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13. In the coordination chemistry of Ln(III) centres, bulky

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of [Cr(H2O)5Cl]Cl2, as silver chloride will be :

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amido ligands are used to stabilize :

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(A) 3 mL

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(A) high coordination numbers (>10)

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(B) 4 mL
(B) coordination numbers of 6 to 8
(C) 5 mL
(C) coordination numbers of 8 to 10
(D) 6 mL
(D) low coordination numbers (<6)

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17. Wilson’s disease is related to : 21. Identify the most stable carbocation among the
(A) Hyper-accumulation of copper following :
(A) Ph+
(B) Deficiency of copper
(B) CH2=CH+
(C) Hyper-accumulation of copper and is treated
effectively with EDTA (C) CH3-C+=O
(D) Hyper-accumulation of copper and is treated (D) CH3-CH2+
effectively with d- Penicillamine 22. Which of the following reaction intermediates is
18. For the ligands F , NH3, CN and CO, the correct
– – stereo-chemically unstable and rapidly inverts like
order of their position in spectrochemical series will ammonia ?
be : (A) Carbocations
(A) F < CN– < NH3 < CO (B) Carbanion
(B) CO < NH3 < F– < CN– (C) Free-radicals
(C) F–< NH3 < CN– < CO (D) Carbenes
(D) CN– < NH3< CO < F– 23. The least stable conformer of cyclohexane is :

19. Identify the correct statement about [Ni(H2O)6]2+ and (A) Chair form
[Cu(H2O)6]2+ : (B) Half chair form
(A) All Ni-O and Cu-O bond lengths of individual (C) Twist boat form
species are equal (D) Boat form
(B) Ni-O(equatorial) and Cu-O(equatorial) are only 24. What type of stereoisomers would you expect for the
equal compound CH3CH(OH)CH(OH)CH3 ?
(C) All Ni—O bond lengths are equal whereas (A) A pair of enantiomers
Cu—O (equatorial) bonds are shorter than
(B) Two pair of enantiomers
Cu—O(axial) bonds
(C) A pair of enantiomers and a meso-dia-
(D) All Cu—O bond lengths are equal whereas
stereoisomer
Ni—O (equatorial) bonds are shorter than
Ni—O(axial) bonds (D) A pair of enantiomers and a pair of dia-
stereoisomers
20. Which of the following possesses highest degree of
25. Addition of HCl to 3-methyl-1-butene at 00C
aromatic character ?
gives :
(A) Cyclopentadienyl anion
(A) 2-Choloro-3-methyl butane
(B) Pyrrole
(B) 2-Choloro-2-methyl butane
(C) Furan
(C) Both (A) and (B)
(D) Thiophene
(D) 40:60 mixture of (A) and (B)

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26. The rate of Diels-Alder reaction of maleic anhydride 31. Which of the following acids have lowest pKa value ?
is fastest with :
(A) HCOOH
(A) 1.3 butadiene
(B) C6H5COOH
(B) 2-methyl-1.3 butadiene
(C) CH3COOH
(C) 2,3 Dimethyl-1.3 butadiene
(D) CH3CH2COOH
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(D) Cyclopentadiene
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32. The least basic amines among the following is :

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27. Which of the following will undergo fastest SN2
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(A) C6H5NH2
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reaction ?

l a s (B) (C6H5)2NH
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(A) Allyl halide
(B) Benzyl halide (C) CH3NH2

(C) a halo acetone (D) (CH3)2NH

(D) Ethyl halide 33. λmax for the compound cyclopent-2-en-one :
28. Friedal Craft’s acylation of benzene in presence of (A) 245nm
CH3COCl/AlCl3 is an example of :
(B) 202nm

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(A) Free radical substitution

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(C)

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(B) Nucleophilic substitution
(C) Electrophilic substitution
l a s 34. The absorption band in the IR spectrum for -O-H is
(D) Electrophilic addition
a g observed at the frequency of :
29. Aldol condensation does not take place between :
(A) 3000-2850 cm-1
(A) Two moles of formaldehyde
(B) 3550-3200 cm-1
(B) Two moles of acetaldehyde
(C) 2260-2200 cm-1
(C) Two moles of acetone
(D) 1660-1640 cm-1
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(D) One mole of acetaldehyde and one mole of

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acetone 35. The chemical shift (d ) for aromatic proton in 1HNMR

c.(A)o >C=O on Clemmenson’ reduction yields >CH
30. Which of the following is not correctly matched ? spectra is in the range :
s e m
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(A) 5.5-6.5

la
2

ag >CHOH
(B) 4.2

(C) 7-8
(C) -COCl on Rosenmunds reduction yields -CHO
(D) -C≡N on Stephen’s reduction yields -CHO (D) 10

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36. The total no peaks in the 1H NMR spectra of the 40. The root mean square velocity of SO2 molecule will
organic compound CH3CH2CH2-OH will be : become double its value at STP when the temperature
is :
(A) 3
(A) 1192K
(B) 5
(B) 819 oC
(C) 4
(C) 298K
(D) 6
(D) 40 oC
37. The carbohydrate which serves as reserve glucose in 41. As per the Maxwell distribution of molecular velocities,
body is : the fraction of total gas molecules which has acquired
(A) Sucrose the most probable velocity will ———— with the
decrease in temperature.
(B) Starch
(A) Increase
(C) Glycogen
(B) Decrease
(D) Fructose (C) Remains constant
38. The sequence in which amino acids are arranged in (D) Can’t say without knowing the pressure
protein is called its :
42. The number of atoms in each different cubic unit cells
(A) Primary structure of monoatomic substances is :

(B) Secondary structure (A) SC-1, BCC-2, FCC-4

(B) SC-8, BCC-9, FCC-14
(C) Tertiary structure
(C) SC-1, BCC-9, FCC-3
(D) Quaternary structure
(D) SC-2, BCC-3, FCC-4
39. Which among the following are not the essential
43. Which liquid crystal phase has the least order and is
molecules of life ?
most liquid-like ?
(A) Proteins
(A) Smectic liquid crystal
(B) Carbohydrates
(B) Cholesteric liquid crystal
(C) Lipids (C) Nematic liquid crystal

(D) Vitamins (D) Discotic liquid crystals

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44. For the first-order reaction, after two average lives 47. Consider the following statements :
(tav) , the concentration of reactant is reduced to (1) Half life period of first order reaction is
________. (Given tav = 1/k, k being its rate constant) independent of the initial concentration of
reactants
(A) 25%
(2) The plot of rate of reaction vs concentration of

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(B) 75%

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reactant is a straight line with slope 2k for a

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unimolecular second order reaction
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(C) 100/e %

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(3) A zero order reaction takes finite time for

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(D) 100/e2 %

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completion while the first order reaction would
45. For a reaction,lA(g) + 2B(g) à C(g) + D(g), dx/dt =
aginitial concentration of A and B are
get completed in infinite time
k [A][B]. The Which of the above statement(s) is/are correct ?
respectively 0.1 M and 0.2 M. Now if the
(A) (1) and (2)
concentration of A is reduced to 0.05 M and that of Y
to 0.05 M, then the rate of reaction relative to the (B) (2) and (3)
initial value would be : (C) (1) and (3)

(A) 1/6
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(D) (1), (2) and (3)

48.. Which of the following photochemical reactions shows
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e highest quantum yield ?
s
(B) 1/8

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a
(C) 1/12
(A) Decomposition of HI
(D) 1/200
(B) Decomposition of HBr
46. The rate constant of a first order reaction at 27 oC is
(C) Formation of HBr from H2 and Br2
10–3 min–1. The temperature coefficient of this reaction
is 2. What is the rate constant (in min–1)at 17 oC for (D) Formation of HCl from H2 and Cl2

this reaction ?
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49. Which among the following plots are linear ? (a-x) is

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. reaction
the concentration of reactant remaining after time, t :

c.(B)o 5 x 10 m
(A) 10–3

em se
(A) (a-x) vs t, for a first order

(B) (a-x) vs t, for laa
s
–4

la (C) 2x 10 s a g half order reaction

ag
–3 –1
(C) (a-x) vs t, for a second order reaction
(D) 10 s –2 –1
(D) (a-x)-1 vs t, for a second order reaction

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50. Strike out the INCORRECT statement(s) from the 52. When one mole of an ideal gas is heated to three times
following ? its initial temperature at constant volume, then the
change in entropy would be :
(1) H, U, w and q are all zero for expansion of
an ideal gas under isothermal conditions (A) Zero

(B) (R-Cv)ln3
(2) The entropy change during an irreversible
adiabetic process is zero (C) Cvln3

(D) Cpln3
(3) Entropy is a state function
53. During the conductometric titration of an acid (placed
(A) (1) only in beaker) by an alkali (taken in burette), the plot

(B) (2) only between the conductance and volume of alkali added
was found to initially decrease and followed by a
(C) (2) and (3) constant value. Which of the following combinations
(D) (1), (2) and (3) would give such a plot ?

(A) Strong acid and strong base
51. Consider the following statements :
(B) Weak acid and strong base
(1) For the H2O system, no. of degrees of freedom
(C) Strong acid and weak base
at its triple point is three
(D) Weak acid and weak base
(2) Water expands on melting and has fusion curve
with a positive slope
54. The standard Gibbs free energy of the electrochemical
(3) No. of phases existing on a line in its phase
reaction
diagram is two
Cr2O72– +2Fe +14H+ à 2Cr3+ +2Fe3+ + 7H2O
Which of these statements is/are correct ?
is –793 kJ/mol. What would be the standard cell
(A) (1) and (3) emf ? (Given F=96500 C mol–1; R = 8.314 JK–1mol–1)

(A) +1.37 V
(B) (1) and (2)
(B) +4.11 V
(C) (2) only
(C) + 2.74 V
(D) (3) only
(D) +2.05 V

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55. What is the molar solubility(s) of Al2(SO4)3 in terms 58. Which of the following is an eigenfunction of the
of Ksp ? operator d2/dx2 ?
(A) s = (Ksp/27)1/5 (A) Cos(ax)
(B) s = (Ksp/72)1/5 (B) eax
(C) s = (Ksp/6)1/2 (C) Sin(ax)

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(D) s = (Ksp/108)1/5 (D) All of these
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56. For Cu2+/Cu, Eo = 0.34V and for Cu2+/Cu+, Eo = 0.15V. 59. The selection rule for a vibrational transition in the

e m
The Eo for the disproportionation of Cu+ would be : simple harmonic oscillator is :
la s
l a s (A) ∆v = 0
a g
ag
(A) –0.19V
(B) 0.19V (B) ∆v = ±1
(C) 0.49 V (C) ∆v = ±2
(D) 0.38V (D) ∆v = ±1, ±2, ±3 etc
57. Which of the following is the expression for 60. The frequency of the absorption of a rigid diatomic
Hamiltonian operator ? rotating molecule when it undergoes the rotational

m
transition from j= 2 à j = 3 energy level will be :

co
− h2 2

.
(A) ∇ +V (A) 3B

em
8π 2 m

s
(B) 4B
− h2
∇ +V
g l a
a
(B) (C) 6B
8π 2 m
(D) 12B
−h ∂2 2
(C)
4π 2 ∂x 2

− h2 ∂2
(D) +V
4π 2 ∂φ 2

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ROUGH WORK

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