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CSIR-UGC-NET Chemical Science June -2022 (18/09/2022)

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Q.21 – Q.60 Multiple Choice Question (MCQ), carry TWO marks each
(for each wrong answer: –0.5). You are required to Answer
Maximum 35 Questions.
21. The base ionization constant 𝐊 𝐛 of ammonia in water is 𝟏. 𝟖 × 𝟏𝟎−𝟓. The value of
acid ionization constant, 𝐊 𝐚 , of the conjugate acid is closest to
(a) 5.6 × 10−10 (b) 1.8 × 10−9 (c) 7.0 × 10−7 (d) 5.6 × 104
22. Consider the following statements about Infrared (IR) spectroscopy.
P. It is used to determine the band gap, the band structure and the charge
carrier. It is used to identify functional group(s) of a compound.
Q. It is used to identify functional group(s) of a compound.
R. It is used to characterize different stretching and bending modes of
vibration in molecules.
S. Heteronuclear diatomic molecules are IR active.
The correct statements are
(a) P, Q, R and S (b) Q, R and S only (c) P, Q and R only (d) Q and R only
23. In the stratosphere, the 𝐂𝐥∙ radical produced from chlorofluorocarbons reacts with
𝐎𝟑 as follows

X and Y are respectively,

(a) X = ; Y =

(b) X = ; Y =

(c) X = ; Y = O2

(d) X = ; Y = O2
24. The known oxidation state(s) of Eu in aqueous solution is/are
(a) +2 and +3 (b) +3 and + 4 (c) +2, +3 and + 4 (d) +3 only
25. In the solid state, the stable structure of the metal cluster, [𝐑𝐮𝟑 (𝐂𝐎)𝟏𝟎 (𝐏𝐏𝐡𝟑 )𝟐 ] is

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(a) (b)

(c) (d)

26. The number of moles of Mg-ATP needed for the reduction of one mole of nitrogen
by nitrogenase enzyme is
(a) 8 (b) 16 (c) 6 (d) 2
𝟐𝟑𝟒 𝟐𝟑𝟎
27. For the following nuclear decay series segment, 𝟗𝟎𝐓𝐡 →→→ 𝟗𝟎𝐓𝐡, the overall
emitted particles are
(a) one β, one α and one neutron (b) two β and one α
(c) three β (d) two β and one neutron
28. What is the order of decreasing carbonyl stretching frequencies in the following
species (P-S)?
[Mn(𝐂𝐎)𝟔 ]+ [Os(𝐂𝐎)𝟔 ]𝟐+ [Ir(𝐂𝐎)𝟔 ]𝟑+ Free CO
P Q R S
(a) Q > P > R > S (b) S > R > Q > P (c) P > Q > R > S (d) R > Q > S > P
29. An octahedral 𝐝𝟔 complex has a single spin-allowed absorption band. The spin-
only magnetic moment (B.M) and the electronic transition for this complex,
respectively, are
(a) 0 and 1T1g ← 1A1g (b) 4.9 and 5T2g ← 5Eg
(c) 4.9 and 5Eg ← 5T2g (d) 0 and 1T1g ← 1A1g
30. The geometry around Te in the symmetrical trimeric species of [𝐓𝐞𝐎𝟐 𝐅]− is
(a) Square planar (b) Tetrahedral (c) Trigonalbipyramidal (d) Octahedral
31. The 1H-NMR spectrum of [(𝐂𝟓 𝐇𝟓 )𝟐 𝐅𝐞(𝐂𝐎)𝟐 ] exhibits two peaks of equal intensity
at room temperature, but four resonances of relative intensities 5:2:2:1 at lower
temperature. The hapticities of 𝐂𝟓 𝐇𝟓− are
(a) η5 and η3 (b) η3 and η1 (c) η3 and η3 (d) η5 and η1

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32. Among 𝐒𝐢𝟑 𝐍𝟒 , 𝛂-𝐁𝐍, 𝐀𝐈𝐍 𝐚𝐧𝐝 (𝐒𝐍)𝐱 the compound with the highest conductivity
is
(a) Si3 N4 (b) α-BN (c) AlN (d) (SN)x
33. The ionization energies (𝐈𝐄𝟏 to 𝐈𝐄𝟓 ) of ‘s’ and ‘p’ block elements (X, Y and Z) are
given below.
𝐈𝐄𝟏 𝐈𝐄𝟐 𝐈𝐄𝟑 𝐈𝐄𝟒 𝐈𝐄𝟓
(𝐊𝐉 𝐦𝐨𝐥−𝟏 ) (𝐊𝐉 𝐦𝐨𝐥−𝟏 ) (𝐊𝐉 𝐦𝐨𝐥−𝟏 ) (𝐊𝐉 𝐦𝐨𝐥−𝟏 ) (𝐊𝐉 𝐦𝐨𝐥−𝟏 )
X 1086 2353 4620 6223 37830
Y 800 2427 3060 25030 32830
Z 496 4562 6910 9543 13350
The number of valence electrons in X, Y and Z are
(a) X = 2 ; Y = 3 ; Z = 4
(b) X = 4 ; Y = 1 ; Z = 1
(c) X = 4 ; Y = 3 ; Z = 1
(d) X = 1 ; Y = 3 ; Z = 4
34. The major product formed in the following reaction is

(a) (b)

(c) (d)

35. Which of the following species is/are aromatic?

P Q R
(a) only P (b) only Q (c) only Q and R (d) only P and Q
36. The correct order for the magnitude of heats of formation of the following
structural isomers is

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P Q R
(a) P > Q > R (b) Q > P > R (c) R > P > Q (d) P > R > Q
37. The following reaction sequence is an example of

(a) Convergent synthesis (b) Linear synthesis

(c) Diverted synthesis (d) Divergent synthesis
38. The products of the following reaction of a sample of 2-butanol (𝐞𝐞 = 𝐗 %) show
two doublets in 1H NMR spectrum in the ratio of 3:2. The value of X is ________.

(𝐞𝐞 = 𝐗 %) (𝟏𝟎𝟎% yield)

(a) 40 (b) 60 (c) 20 (d) 80
39. The major product formed in the following reaction is

(a) (b)

(c) (d)

40. The intermediates involved in the given transformation are

P Q

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R S
(a) P and S (b) P and Q (c) R and S (d) R and Q
41. The following reaction involves a

(a) Photochemical 10π-electrocyclic ring closure

(b) Thermal 6π-electrocyclic ring closure
(c) Thermal 10π-electrocyclic ring closure
(d) Photochemical 6π-electrocyclic ring closure
42. The pair of reactions depicted below are

(a) enantioselective reactions (b) diastereotopic reactions

(c) diastereoselective reactions (d) enantiospecific reactions
43. Biosynthetic precursors of the following natural product are

Phenylalanine alanine acetyl CoA geranyl CoA

P Q R S
(a) Q and S (b) Q and R (c) P and S (d) P and R
44. The structure that corresponds to the following 1H NMR spectral data is
1H NMR : δ 3.64 (s, 6H), 2.02 (dd, 2H), 1.62 (td, 1H), 1.20 (td, 1H).

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(a) (b) (c) (d)

45. The number of signals observed in the proton-decoupled 13C-NMR spectrum of

the following compound is

(a) 4 (b) 2 (c) 3 (d) 5

46. The correct IUPAC name of the following compound is

(a) (E)-3-(chloromethyl)pent-3-en-2-one (b) (Z)-3-(chloromethyl)pent-2-en-4-one

(c) (E)-3-(chloromethyl)pent-2-en-4-one (d) (Z)-3-(chloromethyl)pent-3-en-2-one
47. In the process of polyesterification, the average length of polymer formed by a
stepwise process grows linearly with time. The fraction condensed (extent of
reaction) and the degree of polymerization at time 𝐭 = 𝟏. 𝟎 hour, of a polymer
formed with 𝐤 𝐫 = 𝟏. 𝟖𝟎 × 𝟏𝟎−𝟐 𝐝𝐦𝟑 𝐦𝐨𝐥−𝟏 𝐬 −𝟏 and initial monomer
concentration of 𝟑. 𝟎𝟎 × 𝟏𝟎−𝟐 𝐦𝐨𝐥 𝐝𝐦−𝟑 , are respectively
(a) 0.66 and 2.94 (b) 0.33 and 1.50 (c) 0.16 and 1.19 (d) 0.33 and 2.94
48.
For a zero-order reaction , if the initial concentration of A is [𝐀]𝟎 , the
time required to consume all the reactant is
(a) 2[A]0 /k (b) [A]0 /k (c) [A] − [A]0 /k (d) k [A]0
49. The effective activation energy for the reaction:

With the following potential energy versus reaction coordinate plot is

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(a) Ea − Ea ′ − Eb (b) Ea + Eb − Ea ′ (c) −Ea + Ea ′ − Eb (d) Ea + Ea ′ − Eb

50. Two schematic potential energy surfaces for bond bending motions are indicated
as A and B in the accompanying diagram.

The out-of-plane C-H wags in iodoform and chloroform would respectively

correspond to the potential energy surfaces
(a) A and B (b) A and A (c) B and A (d) B and B
51. The limiting molar conductivities, at 𝟐𝟓° 𝐂, of few ionic compounds are given in the
table below. The limiting molar conductivity of AgI, in units of milli-Siemens
(𝐦𝐞𝐭𝐫𝐞)𝟐 𝐦𝐨𝐥−𝟏 , at 𝟐𝟓° 𝐂 is
Ionic Compound Molar conductivity
(milli-Siemens (𝐦𝐞𝐭𝐫𝐞)𝟐 𝐦𝐨𝐥−𝟏 )
NaI 12.69
𝐍𝐚𝐍𝐎𝟑 12.16
𝐀𝐠𝐍𝐎𝟑 13.34
(a) 13.87 (b) 12.73 (c) 11.63 (d) 10.78
52. For the formaldehyde molecule (𝐇𝟐 CO) having 𝐂𝟐𝐕 symmetry with the character
table as given below,
𝐂𝟐𝐕 E 𝐂𝟐 𝛔𝐕 (𝐱𝐳) 𝛔𝐕 (𝐲𝐳)

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𝐀𝟏 1 1 1 1 𝐳
𝐀𝟐 1 1 −𝟏 −𝟏 𝐑𝐙
𝐁𝟏 1 −𝟏 1 −𝟏 𝐗, 𝐑 𝐲
𝐁𝟐 1 −𝟏 −𝟏 1 𝐲, 𝐑 𝐗
The reducible representation Г𝟑𝐍 (or) Г𝐭𝐨𝐭 is Г𝟑𝐍 = 𝟒𝐀 𝟏 + 𝐀 𝟐 + 𝟒𝐁𝟏 + 𝟑𝐁𝟐 . The
reducible representation for the vibrational modes alone, namely Г𝐯𝐢𝐛 will be
(a) 4A1 + 2B2 (b) 3A1 + 2B1 + B2 (c) 3A1 + B1 + 2B2 (d) 4A1 + B1 + B2
53. ̂ 2, 𝐁
Given that the commutator [𝐀 ̂ ] = [𝐀
̂ ,𝐁
̂] 𝐀
̂ +𝐀
̂ [𝐀
̂ ,𝐁
̂ ] , the value of [𝐱, [𝐏
̂𝟐, 𝐱] ]

is
(a) 2iћ2 (b) 2ћ2 (c) −2ћ2 (d) −2iћ2
54. For a system of two fermionic particles that can be in any one of three possible
quantum states each, the ratio of the probability that two particles are in the same
state to that when the two particles are in different states is
(a) 1 (b) 1⁄2 (c) 0 (d) 1⁄3
55. The energy of an electron in a hydrogenic atom is −𝟏𝟑. 𝟔 𝐙𝟐 /𝐧𝟐 eV, where Z is the
atomic number and n is the principal quantum number. Neglecting inter-
electronic repulsion, the energy of the first excited state of the He atom is
(a) −68.0 eV (b) −13.6 eV (c) −27.2 eV (d) −108.8 eV
56. The correct match of the following fine chemicals in column P with their
sustainable feedstocks in column Q is
Column P Column Q
A. I. Lignin

B. II. Xylose

C. III. Vegetable oil

(a) A - I ; B - III ; C - II
(b) A - II ; B - III ; C - I
(c) A - II ; B - I ; C - III

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(d) A - III ; B - II ; C - I

57. The eigen functions of a particle in a cubic box with potential 𝐕 = 𝟎 in the region
𝟎 ≤ 𝐱 ≤ 𝐋, 𝟎 ≤ 𝐲 ≤ 𝐋, and 𝟎 ≤ 𝐳 ≤ 𝐋, and 𝐕 = ∞ outside are denoted as
𝚿(𝐧𝐱, 𝐧𝐲, 𝐧𝐳, ). Which of the following functions is also an eigen function of the
Hamiltonian?
(a) ϕ1 = Ψ123 − Ψ312 (b) ϕ2 = Ψ111 − Ψ222
(c) ϕ3 = Ψ121 − Ψ122 (d) ϕ4 = Ψ212 − Ψ113
58. The rotational absorption spectrum of 1𝐇 𝟑𝟓 Cl shows the following lines:

Neglecting centrifugal distortion, the value of the rotational constant in units of

𝐜𝐦−𝟏 is estimated as
(a) 3 (b) 5 (c) 10 (d) 20
59. During the phase transition, at constant temperature, of a solid from one form to
another, the change in molar volume, ∆𝐕𝐦 = 𝟏. 𝟎 𝐜𝐦𝟑 𝐦𝐨𝐥−𝟏 is independent of
pressure. The change in molar Gibbs free energy, in units of 𝐉 𝐦𝐨𝐥−𝟏 , when the
pressure is increased from 1 bar to 3 bars is
(a) 4 × 10−1 (b) 3 × 10−1 (c) 2 × 10−1 (d) 1 × 10−1
60. 𝟎 𝟎
Given that at 298.15 K, 𝐄𝐅𝐞 +𝟑 /𝐅𝐞 = −𝟎. 𝟎𝟒𝐕; 𝐄𝐅𝐞+𝟐 /𝐅𝐞 = −𝟎. 𝟎𝟒𝐕. At this

𝟎
temperature, the value of 𝐄𝐅𝐞 +𝟑 /𝐅𝐞+𝟐 is

(a) 1.24 V (b) 1.00 V (c) 0.40 V (d) 0.76 V

Q.61 – Q.120 Multiple Choice Question (MCQ), carry FOUR marks

each (for each wrong answer: –1). You are required to Answer
Maximum 25 Questions.
61. A solute S has partition coefficient (𝐊 𝐃 ) of 5.0 between water and chloroform. A
50 ml sample of a 0.050 M aqueous solution of the solute is extracted with 15 ml of

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chloroform. The extraction efficiency for the separation is

(a) 50 % (b) 60 % (c) 30 % (d) 40 %
62. The nucleophilic substituents of 𝐑𝐑′ 𝐑′ ′𝐒𝐢𝐗 (𝐑, 𝐑′ , 𝐑′ ′ = 𝐚𝐥𝐤𝐲𝐥 𝐠𝐫𝐨𝐮𝐩𝐬) by a
nucleophile Y gives the product 𝐑𝐑′ 𝐑′ ′𝐒𝐢𝐘. Among the following
P. Silylium cation is formed during the reaction.
Q. It is a second order reaction.
R. The cleavage of the Si−X bond is not the rate determining step.
S. The product always shows inversion of configuration.
Identify the correct statements.
(a) Q and R only (b) P and Q only (c) R and S only (d) Q, R and S only
63. The number of electrons involved in the enzymatic action of cytochrome c oxidase,
carbonic anhydrase and photosynthetic oxygen evolving complex, respectively, are
(a) 2, 0, 4 (b) 4, 0, 4 (c) 4, 1, 0 (d) 2, 0, 2
64. Consider the following molecules / ions
[𝐌𝐧(𝐇𝟐 𝐎)𝟔 ]𝟑+ [𝐍𝐢(𝐇𝟐 𝐎)𝟔 ]𝟐+ 𝐕𝐂𝐥𝟒
P Q R
The Jahn-Teller effect is expected for
(a) P and R only (b) P only (c) R only (d) P and Q only
65. The number of allowed EPR lines expected for a metal ion with 3 unpaired
𝟕
electrons is (𝐍𝐮𝐜𝐥𝐞𝐚𝐫 𝐬𝐩𝐢𝐧 (𝐈) = 𝟐)

(a) 8 (b) 32 (c) 36 (d) 24

66. The statement(s) that correctly describe(s) the molecular orbital (MO) diagram of
hydroxyl radical (OH.) is / are (consider the O-H bond to be along the x-axis)
P. The Highest Occupied Molecular Orbital (HOMO) is a non-bonded MO that
is predominantly formed with 𝟐𝐩𝐳 and 𝟐𝐩𝐲 atomic orbitals (AOs) of O-atom
Q. The HOMO is a σ-bonded MO that is predominantly formed by the overlap
of H(1s) and O(2s) AOs
R. The σ-bonding MO is formed by the overlap of H(1s) and O(𝟐𝐩𝐳 ) AOs
S. The σ-bonding MO is formed by the overlap of H(1s) and O(𝟐𝐩𝐗 ) AOs
(a) P and R only (b) P and S only (c) Q only (d) S only
67. The correct statement regarding the following physical properties is
(a) Bond orders follows Li2 < C2 < B2 < N2 order

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(b) Melting point follows NH3 < PH3 < AsH3 < SbH3 order
(c) Pauling electronegativity follows Al < Si < S < P order
(d) First ionization energy follows Li < B < Be < C order
68. The second order rate constants for the outer sphere self-exchange electron
transfer reactions for [𝐑𝐮(𝐍𝐇𝟑 )𝟔 ]𝟐+ /[𝐑𝐮(𝐍𝐇𝟑 )𝟔 ]𝟑+ and [Co(𝐍𝐇𝟑 )𝟔 ]𝟐+ /
[Co(𝐍𝐇𝟑 )𝟔 ]𝟑+ are 𝟗. 𝟐 × 𝟏𝟎𝟐 𝐌−𝟏 𝐬𝐞𝐜 −𝟏 𝐚𝐧𝐝 ≤ 𝟏𝟎−𝟗 𝐌−𝟏 𝐬𝐞𝐜 −𝟏 , respectively.
The correct rationale for the above data is
(a) The change in the number of σ∗ - electrons in Co(II)/Co(III) system.
(b) The change in the number of π∗ - electrons in Co(II)/Co(III) system.
(c) The change in the number of both σ∗ and π∗ - electrons in Co(II)/Co(III) system.
(d) The change in the number of σ∗ - electrons in Ru(II)/Ru(III) system.
69. Consider the following statements about the oxo-process:
P. The reaction is first order with respect to olefin.
Q. The rate is faster for terminal olefins compared to internal olefins.
R. The rate is faster for internal olefins compared to terminal olefins.
S. Excess of CO inhibits the reaction.
The correct statements are
(a) P, Q and S only (b) R and S only (c) P and Q only (d) P and S only
70. The electronic spectrum of an aqueous solution of [𝐍𝐢(𝐇𝟐 𝐎)𝟔 ]𝟐+ shows three
distinct bands:
( ~400 nm ) ( ~690 nm ) ( ~1070 nm )
A B C
The transitions assigned to A, B and C, respectively, are
(a) A = T2g (P) ← A2g ; B = T2g ← A2g ; C = T1g ← A2g
(b) A = T1g (P) ← A2g ; B = T1g ← A2g ; C = T2g ← A2g
(c) A = T2g ← A2g ; B = T1g ← A2g ; C = T1g (P) ← A2g
(d) A = T1g ← A2g ; B = T2g ← A2g ; C = T1g (P) ← A2g
71. Consider the following statements about nanoparticles.
P. The energy gap between the valence and conduction bands is greater for
semiconductor nanoparticles than that in metal nanoparticles
Q. Metal nanoparticles exhibit surface Plasmon resonance.
R. Top-down and bottom-up synthetic methods are used to prepare
nanoparticles.
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The correct statements are

(a) Q and R only (b) P and Q only (c) P and R only (d) P, Q and R
72. Identify the series showing isolobal analogy,
𝐂𝐇𝟑, [𝐅𝐞(𝐂𝐎)𝟓 ]+ 𝐂𝐇𝟑+ , [𝐂𝐫(𝐂𝐎)𝟓 ]− 𝐂𝐇𝟑+ , 𝐍𝐢(𝐂𝐎)𝟑 𝐂𝐇𝟑+ , 𝐂𝐩𝐂𝐨
P Q R S
(a) P and Q only (b) P, R and S only (c) Q and R only (d) P and S only
73. Consider the following pairs of compounds,
𝐍𝐇𝟒 𝐂𝐥 𝐚𝐧𝐝 𝐅𝐞𝐎 𝐍𝐇𝟑 . 𝐁𝐅𝟑 𝐚𝐧𝐝 𝐁𝐂𝐥𝟑 𝐇𝐒𝐎𝟑 𝐅 𝐚𝐧𝐝 𝐇𝐅
P Q R
The more acidic species in (P), (Q) and (R) are, respectively
(a) FeO, BCl3 and HF (b) NH4 Cl, NH3 . BF3 and HF
(c) FeO, NH3 . BF3 and HSO3 F (d) NH4 Cl, BCl3 and HSO3 F
74. The calculated magnetic moment (B.M) for the ground state of a 𝐟 𝟓 ion is
(a) √35/7 (b) √35 (c) √35/14 (d) 35/14
75. Consider the statements about the following species, ClF, [𝐂𝐥𝐅𝟐 ]+ , 𝐂𝐥𝐅𝟑 , [𝐂𝐥𝐅𝟒 ]+
and 𝐂𝐥𝐅𝟓
P. There are 9 lone pairs of electrons on the chlorine atoms in the five species
Q. The species [𝐂𝐥𝐅𝟒 ]+ has a tetrahedral shape
R. The compound 𝐂𝐥𝐅𝟑 is a very strong fluorinated agent
(a) Q and R only (b) P and R only (c) P and Q only (d) P, Q and R
76. Consider the following statements describing the properties of (𝐂𝐅𝟑 )𝟑 𝐁. 𝐂𝐎
P. The CO stretching frequency in IR is less than 2143 𝐜𝐦−𝟏 .
Q. The 19F NMR spectrum shows one singlet resonance only.
R. The point group of (𝐂𝐅𝟑 )𝟑 𝐁. 𝐂𝐎 is 𝐂𝟑𝐯 .
S. (𝐂𝐅𝟑 )𝟑 𝐁. 𝐂𝐎 reacts with KF to form 𝐊[(𝐂𝐅𝟑 )𝟑 𝐁𝐂(𝐎)𝐅].
The correct statements are
(a) P, R and S only (b) R and S only (c) P, Q and R only (d) P and S only
77. The reaction of HF with SnO produces X and with 𝐒𝐧𝐂𝐥𝟒 produces Y. Reaction of
one of them (X, Y) with NaF yields the species 𝐍𝐚𝟒 [𝐒𝐧𝟑 𝐅𝟏𝟎 ].
Among the following,
P. [𝐒𝐧𝟑 𝐅𝟏𝟎 ]𝟒− is obtained from X
Q. In the solid state, X exhibits a ring structure.
R. Stereogenic lone pairs of electron are present in both X and Y.
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S. Y is a weaker lewis acid than X.

Identify the correct statements
(a) P and Q only (b) R and S only (c) P, Q and R only (d) Q, R and S only
78. In the following electron transfer reaction, the one in which the bridging ligand
comes from the reductant is
(a) [IrCl6 ]2− + [Cr(OH2 )6 ]2+ → Products
(b) [Co(NH3 )5 Cl]2+ + [Cr(OH2 )6 ]2+ → Products
(c) [Fe(CN)6 ]4− + [IrCl6 ]2− → Products
(d) [CrO4 ]2− + [Fe(CN)6 ]4− → Products
79. Hydrolysis of the purple isomer of the complex [𝐂𝐨(𝐭𝐫𝐞𝐧)(𝐍𝐇𝟑 )𝐂𝐥]𝟐+ ,
𝐰𝐡𝐞𝐫𝐞 [𝐭𝐫𝐞𝐧 = 𝐓𝐫𝐢𝐬(𝟐-𝐚𝐦𝐢𝐧𝐨𝐞𝐭𝐡𝐲𝐥)𝐚𝐦𝐢𝐧𝐞] under basic conditions results in two
products. The geometry of the intermediate involved in this reaction is
(a) Trigonal bipyramidal (b) square pyramidal
(c) pentagonal planar (d) tetrahedral
80. The reaction of 𝐌𝐨𝐂𝐥𝟐 with [𝐄𝐭 𝟒 𝐍]𝐂𝐥 in dil. HCl and EtOH produces a dianionic
hexanuclear metal clusters.
P. The cluster is [𝐌𝐨𝟔 𝐂𝐥𝟏𝟒 ]𝟐−
Q. The cluster has 136 valence electrons
R. Each metal centre has 4 metal-metal bonds
Identify the correct statement(s) about the cluster.
(a) Q only (b) P and R only (c) Q and R only (d) P, Q and R
81. The major products P and Q formed in the following reaction sequence are

(a) P = ; Q =

(b) P = ; Q =

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(c) P = ; Q =

(d) P = ; Q =

82. Structure of “Q”, based on the following reaction, is

(a) (b) (c) (d)

83. Considering the rate law (𝐫𝐚𝐭𝐞 = 𝐤[𝐞𝐩𝐨𝐱𝐢𝐝𝐞]) for the reaction shown below, the
plausible intermediate is

(a) (b) (c) (d)

84. The reagents “A” and major product “B” in the following reaction sequence are

(a) A = i. NaBH4 ; B =
ii. H2 S, cat. Piperidine

(b) A = i. H2 S, cat. Piperidine ; B =

ii. NaBH4

(c) A = i. H2 S, cat. Piperidine ; B =

ii. NaBH4

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(d) A = i. NaBH4 ; B =
ii. H2 S, cat. Piperidine

85. The major product formed in the following reaction is

(a) (b)

(c) (d)

86. The correct sequence of reagents to effect the following transformation is

(a) i. CHCl3, NaOH (b) i. DDQ

ii. Na/ilq. NH3 ii. Na/ilq. NH3 , EtOH
iii. DDQ iii. CHCl3, NaOH
iv. Na/ilq. NH3 , EtOH iv. Na/ilq. NH3

(c) i. Na/ilq. NH3 , EtOH (d) i. Na/ilq. NH3 , EtOH

ii. DDQ ii. CHCl3, NaOH
iii. CHCl3, NaOH iii. Na/ilq. NH3
iv. Na/ilq. NH3 iv. DDQ
87. The correct match for the molecules given in column P with the spectral data
given in column Q is
Column P Column Q
A. Ethyl acetate I. Two singlets in 1H-NMR
B. 2-chloropentane II. Peak intensity at M:(M+2) is 3:1 in EI-MS
C. 1,2-dibromomethylpropane III. Absorption band at 1740 𝐜𝐦−𝟏 in IR

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(a) A - III ; B - I ; C - II
(b) A - I ; B - III ; C - II
(c) A - II ; B - III ; C - I
(d) A - III ; B - II ; C - I
88. The major product formed in the following reaction sequence is

(a) (b)

(c) (d)

89. Intermediate(s) involved in the following reaction is (are)

P Q R
(a) P and R (b) Q and R (c) P only (d) Q only
90. The intermediates involved in the following reaction are

P Q R S
(a) Q and R (b) Q and S (c) P and R (d) P and Q
91. The stereochemistry of the double bonds in the product is

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(a) 3E, 5E, 7Z (b) 3Z, 5E, 7E (c) 3E, 5Z, 7Z (d) 3Z, 5Z, 7E
92. The reaction(s) with a positive entropy of activation (∆𝐬≠ ) is (are)
P.

Q.

R.

(a) P and R (b) Q and R (c) only R (d) P and Q

93. The correct statement for the following reaction is

(a) involves intermolecular hydride transfer and the product is achiral

(b) involves intramolecular hydride transfer and the product is achiral
(c) involves intramolecular hydride transfer and the product is chiral
(d) involves intermolecular hydride transfer and the product is chiral
94. Given below are the bond dissociation energy (BDE; 𝐤𝐉 𝐦𝐨𝐥−𝟏 ) values. Based on
the data, the correct statement about the following equilibrium is

Bond BDE Bond BDE

(𝐤𝐉 𝐦𝐨𝐥−𝟏 ) (𝐤𝐉 𝐦𝐨𝐥−𝟏 )
O-H −𝟒𝟔𝟎 C-C −𝟑𝟔𝟎
C-H −𝟒𝟐𝟎 C=O −𝟕𝟔𝟎
C-O −𝟑𝟖𝟎 C=C −𝟔𝟑𝟎
(a) A is more stable than B by 70 kJ mol−1
(b) A is more stable than B by 130 kJ mol−1
(c) B is more stable than A by 70 kJ mol−1
(d) B is more stable than A by 130 kJ mol−1

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95. The structure of the compound A in the following reaction sequence is

(a) (b)

(c) (d)

96. The following transformation involves

(a) (i) Norrish type - II ; (ii) fragmentation of a cyclopropyl diradical

(b) (i) Norrish type - I ; (ii) fragmentation of a cyclopropyl diradical
(c) (i) Norrish type - I ; (ii) di-π-methane rearrangement
(d) (i) Norrish type - II ; (ii) di-π-methane rearrangement
97. The correct structure that corresponds to the spectroscopic data given below is
IR (𝐜𝐦−𝟏 ) : 2720, 1710
1H NMR : 𝟗. 𝟖𝟎 (𝐬, 𝟏𝐇), 𝟕. 𝟓𝟎 (𝐝𝐝, 𝐉 = 𝟖. 𝟎, 𝟐. 𝟎 𝐇𝐳, 𝟏𝐇),
(δ in ppm) 𝟕. 𝟒𝟎 (𝐝, 𝐉 = 𝟐. 𝟎 𝐇𝐳, 𝟏𝐇), 𝟔. 𝟗𝟎 (𝐝, 𝐉 = 𝟖. 𝟎 𝐇𝐳, 𝟏𝐇),
𝟑. 𝟗𝟎 (𝐬, 𝟑𝐇), 𝟑. 𝟖𝟎 (𝐬, 𝟑𝐇)

(a) (b) (c) (d)

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98. The major product formed in the following reaction is

(a) (b)

(c) (d)

99. The reaction that will furnish t-BuCOPh as the major product are

(P)

(Q)

(R)

(S)

(a) Only P, Q and R (b) Only Q, R and S (c) Only P and R (d) Only Q and S
100. The major product formed in the following reaction is

(a)
(b)

(c) (d)

101. For the molecule methylenecyclopropene (structure given below), the roots
obtained from the huckel secular determinant can be approximated as
𝛂−𝐄
𝐱 = −𝟐. 𝟎, −𝟎. 𝟑𝟎, +𝟏. 𝟎, +𝟏. 𝟓, where 𝐱 = 𝛃
, with E being the energy of a 𝛑

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orbital.

The delocalization energy of methylenecyclopropene is:

(Given the energy of the ground state 𝛑 orbital of ethylene is E = α + β)
(a) 2a + 2.6 β (b) – (2a + 1.7 β) (c) 0.6 β (d) 0.3 β
102. The lattice structure of α–Fe (bcc) with some lattice planes are shown in the
figure. The planes that will not show X-ray reflections are

(a) A and D (b) A and C (c) B and C (d) C and D

103. Given below is a conjugated system of 11 carbon atoms

Assume the average C−C bond length to be 1.5Å and treat the system as a 1D box.
The frequency of radiation required to cause a transition from the ground state of
𝐡𝟐
the system to the first excited state (take 𝟖𝐦 = 𝐤) is
13 k 11 k 9 k 7 k
(a) 225 (b) 225 (c) 225 (d) 225
h h h h

104. For a C-H bond with a stretching frequency 3000 𝐜𝐦−𝟏 , what is the expected
𝐊
isotope (deuterium) effect 𝐊𝐇 at 298K for a full bond homolysis?
𝐃

Given 𝐡 = 𝟔. 𝟔𝟑 × 𝟏𝟎−𝟑𝟒 𝐉𝐬, 𝐜 = 𝟑 × 𝟏𝟎𝟏𝟎 cm/s, 𝐤 𝐁 = 𝟏. 𝟑𝟖 × 𝟏𝟎−𝟐𝟑 J/K.

(a) e (b) 1 (c) e4 (d) e2
105. The predicted rate law, using the steady state approximation, for the reaction
𝐇𝟐 𝐎𝟐 + 2𝐇 + + 𝟐𝐈 − → 𝐈𝟐 + 𝟐𝐇𝟐 𝐎

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Following the possible mechanism is 8i

Rapid equilibrium

Slow

Fast

Fast

k1 k2 [H+ ][I− ][H2 O2 ]

(a) (b) k 2 [HI][H2 O2 ]
K−1 +K2 [H2 O2 ]
k2 k1
(c) k1 K −1 k 2 [HI][H2 O2 ] (d) [K [H + ][I− ][H2 O2 ]
−1 +K4 ]

106. What is the cell potential (in V) at 298K and 1 bar for the following cell?
𝐙𝐧(𝐬)|𝐙𝐧𝐁𝐫𝟐 (𝐚𝐪, 𝟎. 𝟐𝟎𝐦𝐨𝐥/𝐤𝐠)||𝐀𝐠𝐁𝐫(𝐬)𝐀𝐠(𝐬)|𝐂𝐮
𝟎 𝟎
(given; 𝐄𝐙𝐧 +𝟐 /𝐙𝐧 = −𝟎. 𝟕𝟔𝟐𝐕, 𝐄𝐀𝐠𝐁𝐫/𝐀𝐠 = +𝟎. 𝟕𝟑𝟎𝐕, 𝛄± of 𝐙𝐧𝐁𝐫𝟐 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧 = 0.462)

(a) 0.298 (b) 2.198 (c) 0.531 (d) 1.566

107. The state of an electron in a hydrogenic atom is given by the un-normalized wave
𝟏
function, 𝛟 = {𝐘𝟏𝟎 (Ɵ, 𝛟) + 𝐘𝟏𝟏 (Ɵ, 𝛟)} 𝐑(𝐫) are spherical harmonics and R(r) is
√𝟐

the radial function. The probability that a measurements of 𝐋𝐙 will give an eigen
value of ћ is
1 1 1 1
(a) 2 (b) (c) 3 (d)
√2 √3

108. For a particle exhibiting simple harmonic motion in 1-dimension, the uncertainty
in its position in the state having the following schematic wave function is (zero
point energy 𝐄𝟎 = 𝟏/𝟐ћ𝛚)

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7E0 14E0 14E0 7E0

(a) (b) √ (c) (d) √
K K K K

109. Carbonic anhydrase (𝟐. 𝟓 × 𝟏𝟎−𝟗 𝐦𝐨𝐥 𝐝𝐦−𝟑 ) catalyses hydration of 𝐂𝐎𝟐 in red
blood cells at pH 7.1 and 274 k. The rate of the reaction, 𝛎 (in mol 𝐝𝐦−𝟑 ) reaches
its maximum value when varied with the substrate (S) concentration
(𝐢𝐧 𝐦𝐨𝐥 𝐝𝐦−𝟑 𝐬 −𝟏 ) according to the following equation
𝟏 𝟏𝟎
= 𝟒 {𝟏 + }
𝛎 [𝐒]𝟎
The catalytic efficiency of the enzyme (mol 𝐝𝐦𝟑 𝐬 −𝟏 ) is
(a) 4 × 105 (b) 106 (c) 107 (d) 104
110. A protein has 3 tyrosine residues and ‘n’ tryptophan residues both of which are
the only amino acids absorbing at 280 nm. If the absorbance of the protein having
a concentration of 10µM (in a cuvette of path length 2 cm) is 0.59, the number of
tryptophane residues in the protein must be,
[𝛆𝟐𝟖𝟎 (𝐓𝐲𝐫𝐨𝐬𝐢𝐧𝐞) = 𝟏𝟓𝟎𝟎 𝐌−𝟏 𝐜𝐦−𝟏 ; 𝛆𝟐𝟖𝟎 ( 𝐭𝐫𝐲𝐩𝐭𝐨𝐩𝐡𝐚𝐧𝐞 ) = 𝟓𝟎𝟎𝟎 𝐌−𝟏 𝐜𝐦−𝟏 ]
(a) 11 (b) 5 (c) 2 (d) 7
111. A symmetric top molecule with moments of inertia 𝐈𝐱 = 𝐈𝐲 and 𝐈𝐳 in the body-fixed
𝟏 𝟏 𝟏
axes is described by the Hamiltonian 𝐇 = 𝟐𝐥 (𝐋𝟐𝐱 + 𝐋𝟐𝐲 ) + 𝟐𝐥 𝐋𝟐𝐳. If 𝐈𝐱 = 𝟏 & 𝐈𝐳 = 𝟐,
𝐱 𝐳

the eigen values for the levels with quantum numbers 𝒍 = 𝟏, 𝐦𝒍 = 𝟏, and 𝒍 = 𝟏 ,
𝐦𝒍 = 𝟎, are respectively,
3ћ2 3ћ2
(a) and − ћ2 (b) ћ2 and −ћ2 (c) and ћ2 (d) −ћ2 and ћ2
2 2

112. The partition function for a gas is given by,

𝟑𝐍
𝟏 𝟐𝛑𝐦 𝟐 𝛃𝐚𝐍 𝟐
𝐍
𝐐(𝐍, 𝐕, 𝐓) = ( 𝟐 ) (𝐕 − 𝐍𝐛) 𝐞 𝐕
𝐍! 𝐡 𝛃
The internal energy of the gas is
3 2aN 1 aN2 3 aN2 3 2aN
(a) Nk B T + (b) Nk B T − (c) Nk B T − (d) NRT −
2 V 2 V 2 V 2 V

113. 1 mole of 16𝐎 and 1 mole of 18𝐎 in two different containers of the same volume
𝟐 𝟐

have the same entropy. Assuming there are no rotational and vibratinal
contributions to the entropy, if the temperature of 16𝐎 is 300 K what is the
𝟐

temperature of 18𝐎𝟐 in K?
(a) 37.54 (b) 300.10 (c) 266.66 (d) 273.48
114. The Gibbs free energy of mixing for a regular binary solution of components A

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and B, at temperature T, on the basis of the Margules equation for activity

coefficient, is (in standard notation)
(a) nRT (xA ln𝑥A + xB lnxB ) (b) nRT (xA lnxA + 𝑥B lnxB + ξxA xB )
(c) nRT (xA lnγA + xB lnγB ) (d) nRT ξxA xB
115. Which of the following statements corresponding to the accompanying figures
displaying isotherms is/are correct?

A. Fig X represents an isotherm of type II and point B shows near complete

coverage of the surface.
B. Fig Y represents an isotherm of type II and point B shows near complete
coverage of the surface.
C. Fig X represents an isotherm of type I and point B shows near complete
coverage of the surface.
D. Fig Y represents an isotherm of type III and point B shows beginning of the
multilayer formation.
(a) only statement D is correct (b) statement C and D is correct
(c) statement B and C is correct (d) statement A and B is correct
116. The effective rate constants for a gaseous unimolecular reaction: A→P following
the lindemann-hinshelwood mechanism are 𝟏. 𝟕𝟎 × 𝟏𝟎−𝟑 𝐬 −𝟏 and 2.20× 𝟏𝟎−𝟒 𝐬−𝟏
at [A] = 𝟒. 𝟑𝟕 × 𝟏𝟎−𝟒 mol 𝐝𝐦−𝟑 and 𝟏. 𝟎𝟎 × 𝟏𝟎−𝟓 mol 𝐝𝐦−𝟑 , respectively. The
rate constant for the activation step in the mechanism is approximately equal to
(in 𝐝𝐦𝟑 𝐦𝐨𝐥−𝟏 𝐬 −𝟏 ).
(a) 12.3 (b) 49.4 (c) 6.1 (d) 24.7
117. Six distinguishable particles are distributed over 3 non-degenerate levels, of
energies 0, ε and 2ε. The most probable value for the total energy is
(a) 5ε (b) 7ε (c) 8ε (d) 6ε
118. The vibrational energy of the 𝐧𝐭𝐡 state of HCl is approximately given as

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𝟏 𝟏 𝟐
𝐆(𝐧) = 𝟑𝟎𝟎𝟎 (𝐧 + ) − 𝟓𝟎 (𝐧 + ) 𝐜𝐦−𝟏
𝟐 𝟐
The vibrational quantum number, 𝐧𝐦𝐚𝐱 , beyond which HCl undergoes
dissociation is
(a) 29 (b) 59 (c) 119 (d) 19
119. The molecular weight of polyethene determined in five individual experiments is
given below,
Experiment No. Molecular weight
(g/mole)
1 10,000
2 11,000
3 9,000
4 10,500
5 11,500
The standard deviation in the above measurements is closest to
(a) 850 g/mol (b) 2000 g/mol (c) 1600 g/mol (d) 500 g/mol
120. In the reaction between two ions, the rate constant is 𝐤 𝐫 when the ionic strength (I)
is 0.004. and the rate constant is 𝐤 𝐫 0 when the activity coefficient is 1. The ratio
𝐤 𝐫 /𝐤 𝐫 0 = 0.884. if the charge of one ion is +𝟏. The charge of other ion is close to
(𝐃𝐞𝐛𝐲𝐞-𝐇𝐮𝐤𝐞𝐥 𝐜𝐨𝐧𝐬𝐭𝐚𝐧𝐭 = 𝟎. 𝟓𝟎𝟗 𝐚𝐭 𝟐𝟗𝟖𝐤 ; 𝐥𝐨𝐠 𝟎. 𝟖𝟖𝟒 = −𝟎. 𝟎𝟓)
(a) −1.554 (b) −1.395 (c) −0.777 (d) −0.389

Answer Key
Q.No Ans Q.No Ans Q.No Ans Q.No Ans
21. a 46. d 71. d 96. b
22. b 47. a 72. b 97. c
23. b 48. b 73. d 98. c
24. a 49. b 74. a 99. b
25. a 50. a 75. b 100. d
26. b 51. a 76. b 101. c
27. b 52. b 77. a 102. b
28. d 53. b 78. d 103. b
29. c 54. c 79. a (or) b 104. d
30. c 55. a 80. d 105. a
31. a 56. b 81. b 106. d

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CSIR-UGC-NET - Chemical Science - June - 2022 (18/09/2022)

32. d 57. a 82. c 107. c

33. c 58. c 83. c 108. d
34. c 59. c 84. c 109. c
35. d 60. d 85. d 110. b
36. d 61. b 86. d 111. c
37. a 62. a 87. d 112. c
38. c 63. b 88. c 113. c
39. a 64. a 89. d 114. b
40. b 65. d 90. d 115. c
41. c 66. b 91. d 116. d
42. b 67. d 92. b 117. d
43. d 68. a 93. c 118. a
44. a 69. a 94. a 119. a
45. c 70. b 95. d 120. c

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