CSIR UGC – NET JRF: December 2018

Chemical Science

❖ Question Paper
Section-A
Q.1 A mineral contains a cubic and spherical cavity. The length of the side of the cube is the same as the
diameter of the sphere. If the cubic cavity is half filled with a liquid, what is the approximate ratio of the
volume in liquid cavity to that in the cubic cavity to that in spherical cavity?

(a) 2:1 (b) 1:1 (c) 1:2 (d) 1:4

Q.2 Out of 6 unbiased coins, 5 are tossed independently and they all result in heads. If the 6th is now
independently tossed, the probability of getting head is

(a) 1 (b) 0 (c) 1/2 (d) 1/6

Q.3 What could the forth figure in the sequence be?

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

Q.4 The average age of A, B and C, whose ages are integers x, y and z respectively (x ≤ y ≤ z), is 30. If the
age of B is exactly 5 more than that of A, what is the minimum possible value of z?

(a) 31 (b) 33 (c) 35 (d) 37

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 CSIR UGC – NET JRF: December 2018: Chemical Science 655

Q.5 Percentage-wise distribution of all science students in a university is given in the pie-diagram. The bar
chart shows the distribution of physics student in different sub-areas, where a student takes one and only one
sub-area. What percentage of the total students is girls studying quantum mechanics?

(a) 10 (b) 1 (c) 0.2 (d) 2

Q.6 What is the total number of parallelograms in the given diagram?

(a) 27 (b) 24are shown (c) 22 (d) 14

Q.7 Election results of a city, which contains 3 segments (A, B and C) are given in the table. Percentage votes
obtained by parties X, Y and Z are shown below. Which party won the election?

Segment Total voters % of voting X Y Z

A 2,00,000 60 30 30 40

B 2,50,000 70 40 30 30

C 3,00,000 80 30 40 30

(a) X (b) Y (c) Z (d) It was a tie between X and Y

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Q.8 The diagram shows the dimensions (in cm) of a zircon crystal having a square prism and two identical
square pyramids. What is the volume of this crystal (in cm3)?

(a) 3.2 (b) 3.6 (c) 6.4 (d) 7.2

Q.9 A boy throws a ball with a speed v at a vehicle that is approaching him with a speed V. After bouncing
from the vehicle, the ball hits the boy with a speed

(a) v (b) v+V (c) v + 2V (d) v + 4V

Q.10 Four friends were sharing a pizza. They decided that the oldest friend will get extra piece of pizza. Bahu
is two months older than Kattappa, who in turn is three months younger than Bhalla. Devsena is one month
older than Kattappa. Who should get the extra piece of pizza?

(a) Bahu (b) Devsena (c) Bhalla (d) Kattappa

Q.11 A funnel is connected to a cylindrical vessel of cross-sectional area A shown, to make an interconnected
system of vessel. Water is poured in the cylinder such that the height of water in the funnel is l as shown. If
the level of water in the cylindrical vessel is pushed down by a distance x ˂˂ l, levels of water in the funnel:

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 CSIR UGC – NET JRF: December 2018: Chemical Science 657

(a) remains unchanged (b) 𝐴𝑥

rises by 𝜋𝑙2

(c) rises by
𝜋𝑙 2 (d) 𝐴𝑥 2
rises by 𝜋2 𝑙4
𝐴𝑥

Q.12 Marks (out of 30) of seven students in an examination are 4, 15, 6, 7, 5, a and b, where a (˃0) is a multiple
of 4and b is a prime. What is the maximum possible value of the difference between the maximum and
minimum marks?

(a) 25 (b) 26 (c) 27 (d) 29

Q.13 Two persons A and B start walking in opposite directions from a point. A travel twice as fast as B. the
speed at which B travels is 1 km/h. if A travels 2 km and turns back and starts walking towards B, at what
distance from the starting point will A cross B?

(a) 2 km (b) 4 km (c) 6 km (d) 8 km

Q.14 A person wanted to travel from Charbag to Alambag with an average speed of 60 km/h by car. The
distance between Charbag and Aambag is 2 km. due to heavy traffic, he could travel at 30 km/hfor the first
kilometre of his journey. What should his speed be for the remaining journey to Achieve his average speed
target of 60 km/h?

(a) Cannot achieve his target with any finite speed (b) 60 km/h

(c) 90 km/h (d) 120 km/h

Q.15 The average rainfall over a given place during the three-year period of 2003-2005 was 65 cm. During the
three-year period 2002-2004 the average rainfall was 63 cm. The actual rainfall during 2005 was 60 cm. What
was the rainfall in 2002?

(a) 55 cm (b) 60 cm (c) 54 cm (d) 53 cm

Q.16 In a four consecutive day schedule, four pilots flew fights each on a different day. Mr. A was schedule
to work on Monday, but he traded with Ms. B who was originally scheduled to work on Wednesday, Ms. C
traded with Mr. D, who was originally scheduled to work on Thursday. After all the switching was done, who
worked on Tuesday?

(a) Mr. A (b) Mr. D (c) Ms. B (d) Ms. C

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Q.17 After 6 g of carbon is completely burnt in an atmosphere of 40 g of oxygen, the percentage oxygen left
is:

(a) 80 (b) 60 (c) 40 (d) 20

Q.18 What fraction of the equilateral triangle shown below with three identical sectors of a circle is shaded?

𝜋
(a) 1‒
𝜋
(b) (c) 1‒
2𝜋 (d) 1‒
𝜋√3
2√3 2√3 √3 2

Q.19 How many different vegetables can be made from cauliflower, tomatoes, onions, potatoes and carrots?

(a) 16 (b) 28 (c) 31 (d) 32

Q.20 A bottle of perfume is opened and a person at a distance of 10 m gets the smell after 10 seconds. The
time taken for a person 20 m away to get the smell is about

(a) 20s (b) 40s (c) 14s (d) 80s

Section-B
Q.21 The correct order of accepter ability of the phosphorus ligands is

(a) PMe3 ˃ PPh3 ˃ P(OPh)3 ˃ PF3 (b) PF3 ˃ P(OPh)3 ˃ PPh3 ˃ PMe3

(c) PF3 ˃ PMe3 ˃ PPh3 ˃ P(OPh)3 (d) P(OPh)3 ˃ PF3 ˃ PMe3 ˃ PPh3

Q.22 In the 31P{1H} NMR spectrum of a diamagnetic complex mer-[M(PR3)3Cl3] (M = transition metal, I = 0)
expected number of resonance(s) is

(a) Three (b) One (c) Two (d) Six

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Q.23 Consider the species NO, I2, I2⁻, Cu2+ and VO2+. The number of paramagnetic species among them and
the EPR inactive species, respectively are

(a) 4 and I2⁻ (b) 4 and I2

(c) 3 and VO2+, Cu2+ (d) 3 and NO, Cu2+

Q.24 Identify the correct statement(s) for H3B⸱CO.

(A)sp2 hybridized orbital of B accepts the lone pair of CO.
(B) Its vco value is more than that for free CO.
(C)Formal oxidation state of C is +4 in the compound.
Answer is

(a) (a) and (b) (b) (b) only (c) (a) only (d) (a) and (c)

Q.25 Match the items of Column I with those of Column II.

Column I Column II

A. Leaser source i Electron Capture Detector

B. Thermometric titration ii Polarography

C. Gelatin iii Heat of reaction

D. Gas-Liquid chromatography iv Spectrofluorimetry

Correct answer is

(a) A-iv; B-iii; C-ii; D-i (b) A-i; B-iii; C-ii; D-iv

(c) A-iv; B-ii; C-iii; D-i (d) A-iii; B-ii; C-iv; D-i

Q.26 Consider compounds PF5, SbF5, PH3 and SbH3. The strongest acid and the strongest base among these
are, respectively,

(a) PF5 and PH3 (b) SbF5 and PH3

(c) SbF5 and SbH3 (d) PF5 and SbH3

Q.27 SiCl4, P(O)Cl3, NF3, trans-[SnCl4(py)2] (py = pyridine), those with zero dipole moment are

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(a) SiCl4 and NF3 (b) SiCl4, P(O)Cl3 and trans-SnCl4(py)2

(c) SiCl4 and trans-SnCl4(py)2 (d) NF3 and trans-SnCl4(py)2

Q.28 The standard reduction potential in acid medium for F2, Cl2, Na and Zn are in the order

(a) F2 ˃ Cl2 ˃ Na ˃ Zn (b) F2 ˃ Cl2 ˃ Zn ˃ Na

(c) Na ˃ Zn ˃ Cl2 ˃ F2 (d) Cl2 ˃ F2 ˃ Zn ˃ Na

Q.29 The character of LUMO of CN⁻ and O2 respectively, are

(a) σg and πu (b) πu and σg (c) πg and σu (d) πg and σu

Q.30 The intermediate [Fe(SCN)(H2O)5]2+ is detected in the reaction of [Co(NSC)(H2O)5]2+ with [Fe(H2O)6]2+
in aqueous medium to produce [Co(H2O)6]2+ and [Fe(H2O)6]3+. The mechanism of the reaction is

(a) Interchange dissociative (b) Interchange associative

(c) Inner sphere electron transfer (d) Outer sphere electron transfer

Q.31 The chelate rings made by macrocyclic ligand in vitamin B12 are

(a) one five-membered and three six-membered (b) two five-membered and two six-membered

(c) three five-membered and one six-membered (d) four six-membered

Q.32 For magnesium complex of EDTA2⁻, the number of N-donar and O-donar centers, are respectively,

(a) two and four (b) two and two (c) two and six (d) two and eight

Q.33 The correct set of electronic configurations for metal ions in octahedral coordination geometry for strong
John-teller distortion is

(a) t2g6 eg1, t2g3 eg1, t2g6 eg3 (b) t2g1, t2g3 eg2, t2g6 eg1

(c) t2g3, t2g3 eg1, t2g3 eg2 (d) t2g3 eg2, t2g6 eg2, t2g6 eg3

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Q.34 The order of reactivity of cyclization of following bromocarboxylates to generate corresponding lactones
is

(a) B˃ A˃C (b) A˃C˃B (c) B˃ C˃A (d) C˃B˃ A

Q.35 Oxidation of a with HNO3/H2O provides the product(s), which is(are)

(a) optically inactive as it is racemic mixture (b) optically inactive as it is meso

(c) optically active as it is a single diasteromer (d) optically active as it is a single enantiomer

Q.36 The major product in the following reaction is

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

Q.37 The order of reactivity of the following dienes towards Diels-Alder reaction is

(a) B˃ A˃C (b) A˃C˃B (c) B˃ C˃A (d) C˃B˃ A

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Q.38 Among the following, the optically active compound is

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

Q.39 Among the following, reaction(s) which provide(s) 1-butene as the major product is(are)

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

Q.40 The major product in the following reaction is

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

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Q.41 Among the following, the compound that will have highest rate for nucleophilic substitution through SN1
mechanism is

(a) (b)

(c) (d)

Q.42 The major product in the following reaction is

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

Q.43 The mechanism of acid catalysed hydrolysis of benzonitrile involves

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

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Q.44 In the following energy profile diagram of the reaction given below, the species A would correspond to
the position

(a) I (b) II (c) III (d) IV

Q.45 Following reaction is an example

(a) Alder-Ene Reaction (b) Michael Addition

(c) Sigmatropic Rearrangement (d) Wanger-Meerwein Rearrangement

Q.46 In IR-spectra, the stretching frequency (in cm‒1) of the carbonyl group of the following compounds is in
the order

(a) B˃ A˃C (b) A˃C˃B (c) B˃ C˃A (d) C˃B˃ A

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Q.47 The uncertainty in the position of a moving electron is 100 pm. The uncertainty in its speed is closest to
(me = 9.11 × 10⁻31kg; h = 6.63 × 10⁻34J.s)

(a) 6.0 × 102 m.s‒1 (b) 6.0 × 105 m.s‒1

(c) 6.0 × 108 m.s‒1 (d) 6.0 × 1011 m.s‒1

Q.48 The spectrum of sodium atom has a closely separated doublet at 16965.2 and 16973.4 cm ‒1. The higher
energy transition is due to

(a) 2
P3/2→2S1/2 (b) 2
P1/2→2S1/2 (c) 2
P3/2→2P1/2 (d) 2
S1/2 →2P3/2

Q.49 N2O molecule belongs to the point group

(a) D∞h (b) C∞v (c) C2V (d) S2

Q.50 For a closed system in the absence of non-PV work, the correct statement is:

(a) dU = TdS ‒ PdV (b) dG = VdP + SdT

(c) dU = TdS + PdV (d) dU = VdP ‒ SdT

Q.51 The volume change in a certain phase transition is 2.0 mL mol ‒1 at the transition point. From this, we
may conclude that the transition is most likely a

(a) first order phase transition (b) second order phase transition

(c) third order phase transition (d) λ phase transition

Q.52 Root mean square speed of the molecules of a perfect gas is proportional to

(a) 1/T1/2 (b) T (c) T1/2 (d) 1/T

Q.53 For a second-order reaction, the straight line among the following plots is:

(a) [X] versus time (b) 1/[X] versus time (c) log[X] versus 1/time (d) log[X] versus time

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Q.54 The activation energy of a reaction reduces by 12 kcal mol ‒1 in the presence of an enzyme at 300 K.
assuming pseudo-first order kinetics, calculate the factor by which the reaction rate is increased. [Given: R =
2 cal K‒1mol‒1]

(a) 2 × 10‒9 (b) 1.02 (c) 8.7 × 106 (d) 5 × 108

Q.55 The correct statement among the following is:

(a) Salt bridge is required for the mixing of the solutions in the two half cells.

(b) Salt bridge allows current to flow between the half cells without mixing the solutions.

(c) Salt bridge enhances the rate of reaction.

(d) Salt bridge consists of a non-electrolyte in a gel.

Q.56 The standard free energy of the reaction

AgBr(s) → Ag+(aq) + Br‒(aq)
is closest to
(E0 (AgBr/Ag, Br‒) = +0.007 V, E0 (Ag/Ag+) = 0.80 V; F = 96500 C mol‒1)

(a) 7 kJ mol‒1 (b) 70 J mol‒1 (c) 70 kJ mol‒1 (d) 7 J mol‒1

Q.57 The internal pressure of a liquid drop (radius = 10⁻6) is greater than the external pressure by 1.5 × 105 N
m‒2. The surface tension () of the liquid is closest to

(a) 150 (b) 125 (c) 125 (d) 75

Q.58 In a cubic crystal, the (111) and (222) reflections are observed, but not the (001) reflection. The Bravais
lattice is

(a) Body centred cubic (b) Face centred cubic (c) Simple cubic (d) Side centred cubic

Q.59 The dispersity of a polymeric sample is

(a) < 𝑀2 > (b) < 𝑀 >2 (c) < 𝑀2 > (d) <𝑀>
< 𝑀 >2 < 𝑀2 > <𝑀> < 𝑀 >2

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Q.60 The keto-hexose among the following is

(a) Xylose (b) Galactose (c) Fructose (d) Mannose

Section-C
Q.61 The product for the reaction given below is

(a) (b)

(c) (d)

Q.62 The 31P{1H} NMR spectrum of cis-[Pt(PEt3)2Cl2] (195Pt (33.8% abundance) I = ½; its other isotopes are
NMR inactive; 31P : I = ½) is comprised with satellite peaks a

(a) triplet (b) singlet (c) doublet (d) Quartet

Q.63 The correct order of intensity of the d-d transitions in the complexes of a 3d transitions metal ion M2+ is

(a) Cis-[M(H2O)4Cl2] ˃ trans-[M(H2O)4Cl2] ˃ [M(H2O)6]2+

(b) [M(H2O)6]2+ ˃ Cis-[M(H2O)4Cl2] ˃ trans-[M(H2O)4Cl2]

(c) trans-[M(H2O)4Cl2] ˃ Cis-[M(H2O)4Cl2] ˃ [M(H2O)6]2+

(d) [M(H2O)6]2+ ˃ Cis-[M(H2O)4Cl2] ≈ trans-[M(H2O)4Cl2]

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Q.64 The reaction of decaborane B10H14 with acetylene in the presence of Et2S gives

(a) C2B10H12 (b) C2B8H10 (c) C2B10H14 (d) C2B9H11

Q.65 In compound N3P3F6, the geometry around nitrogen and phosphorus, respectively, are

(a) pyramidal and tetrahedral (b) planar and tetrahedral

(c) pyramidal and planar (d) planar and tetrahedral

Q.66 The number of 2c-2e bonds (‘x’) of a molecule is related to ‘N’ (valance electrons) and ‘n’(skeletal
atoms) by x = (8n‒N)/2. For P4S3, the values of x, N and n, respectively, are

(a) 9, 38, 7 (b) 7, 24, 9 (c) 9, 38, 7 (d) 9, 24, 7

Q.67 match the following complexes with their νCO stretching frequency

Complex νCO (cm‒1) values

(A) Mo(PF3)(CO)3 (i) 1835, 1934

(B) Mo(P(OMe)3)(CO)3 (ii) 1888, 1977

(C) Mo(PPh3)3)(CO)3 (iii) 2055, 2090

(D) Mo(pyridine)3(CO)3 (iv) 1746, 1888

The correct match is

(a) A - i; B - iv; C - ii; D - iii (b) A - iii; B - ii; C - i; D – iv

(c) A - iv; B - i; C - iii; D - ii (d) A - i; B - ii; C - iii; D - iv

Q.68 νCN in [Fe(CN)6]3⁻ (A) and [Fe(CN)6]4⁻ (B) and νCO in [Cr(CO)3(NH3)3] (C) and [Cr(CO)6] (D) are
compared below. The pair with correct order is:

(a) A˃B ; C˃D (b) A˃B ; C˂D (c) A˂B ; C˃D (d) A˂B ; C˂D

Q.69 Consider the following statements for FeO4]2⁻

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 CSIR UGC – NET JRF: December 2018: Chemical Science 669

A. It is stable in the pH range 0-14.

B. It is stable in strongly basic medium only.
C. It is very strong oxidising agent.
D. The isomer shift in its Mossbauer spectrum is more negative compared to that of FeCl 3.
The correct statements are

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

Q.70 The isomer A and B undergo base hydrolysis by forming a trigonal bipyramidal intermediate. The correct
statement is

(a) A react more faster than B and both result in a mixture of products

(b) B react more faster than A and both result in a mixture of products

(c) A react more faster than B and B result in a mixture of products

(d) A react more faster than B and A result in a mixture of products

Q.71 B2H6 reacts with

A. water to give boric acid and H2
B. oxygen to give B2O3 and H2
C. water to give boric acid and H2O
D. oxygen to give B2O3 and H2O
Correct statements from the above are:

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

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Q.72 The ligand that binds strongly to the nickel center in (2,2’-bipyridine) Ni(0) complex is

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

Q.73 Match the items given in Column I with those given Column II

Column I Column II

A. Magic number i Nuclear fission

B. Liquid drop model of nucleus ii Q-value

C. Actinides iii Radioactivity

D. Threshold energy iv Shell model of nucleus

The correct match is

(a) A - iv; B - i; C - iii; D - ii (b) A - ii; B - i; C - iii; D – iv

(c) A - iii; B - iv; C - i; D - ii (d) A - vi; B - iii; C - i; D – ii

Q.74 The cluster type and geometry of the species [Rh9P(CO)21]2⁻ are

(a) closo, tricapped trigonal prism (b) arachno, trigonal prism

(c) nido, capped square antiprism (d) nido, bicapped trigonal prism

Q.75 Hydroformylation of 1- propene with [HRh(CO)L2] leads to linear and branched formylated products.
The linear hydroformylated product is formed with highest selectivity when ‘L’ in the rhodium complex is

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

Q.76 The hydrocarbon having an analogous structure to that of P4O6 is

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(a) [(CH)4 (μ ‒ CH2)6] (b) [(CH)6 (μ ‒ CH2)4] (c) [(CH2)4 (μ ‒ CH)6] (d) [(CH2)4 (μ ‒ CH)4]

Q.77 Match the items given below in the three columns

Metalloprotein Species coordinated Resonance Raman O‒O

to metal centre(s) stretching frequency (cm )
‒1

A. Oxymyoglobin I η2: η2‒O22⁻ X. 844

B. Oxyhemocyanin II HO2⁻ Y. 803

C. Oxyhemerythrin III O2⁻ Z. 1105

Correct matches

(a) A-III-Z; B-I-Y; C-II-X (b) A-II-Y; B-I-X; C-III-Z

(c) A-III-Y; B-I-Z; C-II-X (d) A-I-X; B-II-Y; C-III-Z

Q.78 A solid sample of Na[Fe(EDTA)(H2O)n] (X) showed 5.6% weight loss at 120°C in a thermogravimetric
experiment. Identify the complex left after this weight loss.

(a) Na[Fe(EDTA)(H2O)] (b) Na[Fe(EDTA)]

(c) Na[Fe(EDTA)(H2O)3] (d) Na[Fe(EDTA)(H2O)2]

Q.79 Consider the two sets of molecules.

Set A: [AlF6]3⁻, [PF6]⁻, [SF6] and [SiF6]2⁻
Set B: [Ba(H2O)6]2+, [Mg(H2O)6]2+, [Ca(H2O)6]2+, [Sr(H2O)6]2+.
The slowest ligand exchange rate in Set A and Set B are, respectively

(a) [AlF6]3⁻ and [Sr(H2O)6]2+. (b) [SF6] and [Mg(H2O)6]2+.

(c) [SiF6]2⁻ and[Ca(H2O)6]2+. (d) [PF6]⁻ and[Ca(H2O)6]2+.

Q.80consider the following statements for Eu3+

A. The positions of sharp bands in UV-vis spectra of its complexes depend heavily on the ligand environment.
B. Its ground state term symbol is 7F0.
C. The observed magnetic moment is due to populated higher J level.

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D. At 2 K its magnetic moment approaches to zero.

The set of correct statements is

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

Q.81 The major product in the following reaction is

(a) (b)

(c) (d)

Q.82 Structure of the compound displaying following characteristic spectral data

IR: 1720 cm‒1
1
H NMR: 6.2(br s, 1H), 5.5(br s, 1H), 4.2(q, 2H), 2.0(s, 3H), 1.1(t, 3H) is

(a) (b)

(c) (d)

Q.83 The major product in the following reaction is

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

Q.84 The intermediate(s) involved in the following reaction is(are)

(a) I only (b) II only (c) I and II only (d) I and III only

Q.85 Correct sequence of reagents to be used for the following conversion is

(a) (I) NaH, 1-fluoronapthalene; (II) NaBH4; (III) i. (CH2O)n, Me2NH.HCl ii. 5 N NaOH.

(b) (I) NaBH4; (II) NaH, 1-fluoronapthalene; (III) i. (CH2O)n, Me2NH.HCl ii. 5 N NaOH.

(c) (I) i. (CH2O)n, Me2NH.HCl; ii. 5 N NaOH (II) NaBH4; (III) NaH, 1-fluoronapthalene.

(d) (I) i. (CH2O)n, Me2NH.HCl; ii. 5 N NaOH (II) NaH, 1-fluoronapthalene; (III) NaBH4.

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 674 CSIR UGC – NET JRF Chemical Science Solved Papers

Q.86 The major product A and B formed in the following reaction are

(a) (b)

(c) (d)

Q.87 The major product in the following reaction is

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

Q.88 The major product in the following reaction is

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 CSIR UGC – NET JRF: December 2018: Chemical Science 675

(a) (b)

(c) (d)

Q.89 The major product in the following reaction is

(a) (b)

(c) (d)

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 676 CSIR UGC – NET JRF Chemical Science Solved Papers

Q.90 The major product in the following photochemical reaction is

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

Q.91 Correct sequence of reagent to be used for the following conversion is

(a) (I) LDA, EtBr; (II) EtLi; (III) H3O+ (b) (I) EtLi; (II) LDA, EtBr; (III) H3O+

(c) (I) H3O+; (II) EtLi; (III) LDA, EtBr (d) (I) EtLi; (II) H3O+; (III) LDA, EtBr

Q.92 Both, 1-chloro- phenylpropan-2-one and 1-chloro-3- phenylpropan-2-one give same product A when
heated in the presence of NaOMe. The product A is

(a) methyl 3-phenylpropanoate (b) methyl 2-phenylpropanoate

(c) Methyl 2-methoxy-2-phenylacetate (d) 1-methoxy3-phenylpropan-2-one

Q.93 The major product in the following reaction sequence is

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 CSIR UGC – NET JRF: December 2018: Chemical Science 677

(a) (b)

(c) (d)

Q.94 The major product in the following reaction is

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

Q.95 The structure of products A and B formed in the Edman degradation of the dipeptide are

(a) (b)

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 678 CSIR UGC – NET JRF Chemical Science Solved Papers

(c) (d)

Q.96 Partial spectroscopic data is given below for an organic compound:

i. 4 signals between δ 120-150 ppm in 13C NMR spectrum
ii. 2 doublets between δ 6.8-8.5 ppm in 1H NMR spectrum
iii. an absorption band at 1724 cm‒1 in IR spectrum
the structure of the compound is

(a) (b)

(c) (d)

Q.97 The major product in the following reaction is

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

Q.98 The major products A and B in the following reaction sequence are

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 CSIR UGC – NET JRF: December 2018: Chemical Science 679

(a) (b)

(c) (d)

Q.99 The compound P undergoes a pericyclic reaction under photochemical conditions to give compound Q.
In compound Q, the relative stereochemistry and 1H NMR chemical shift values of methyl groups ( in δ ppm),
respectively, are

(a) cis; ‒5 (b) trans; 17 (c) cis; 17 (d) trans; ‒5

Q.100 The major products A and B in the following reaction sequence are

(a) (b)

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 680 CSIR UGC – NET JRF Chemical Science Solved Papers

(c) (d)

Q.101 Arrange the following molecules in order of increasing fundamental vibrational frequencies

(a) O22⁻ ˂ O2⁻ ˂ O2 ˂ O2+ (b) O2 ˂ O2+ ˂ O2⁻ ˂ O22⁻

(c) O22⁻ ˂ O2⁻ ˂ O2+ ˂ O2 (d) O2+ ˂ O2 ˂ O2⁻ ˂ O22⁻

Q.102 One of the Hückel molecular orbitals of 1,3-butadiene is

𝜑 = 0.60𝜒1 + 0.37𝜒2 − 0.37𝜒3 − 0.60𝜒4
The energy of this orbital in terms of the coulomb (α) and resonance(β) integrals is:

(a) α + 1.62β (b) α + 0.62β (c) α ‒ 0.62β (d) α ‒ 1.62β

Q.103 A molecule AB2 shows the following IR and Raman spectra

ṽ (cm‒1) IR Raman

2215 vs, PR s, depol.

1250 vs, PR vs, pol.

560 s, PQR ‒

The structure of the molecule is:

(a) Linear symmetrical (D∞h) (b) Bent symmetrical (C2v)

(c) Linear asymmetrical (C∞v) (d) Bent asymmetrical (Cs)

Q.104 For a one-dimensional (x) harmonic oscillator perturbed by an x3 potential, the sum of the frist order
and second order corrections to the ground state energy is:

(a) ˂0 (b) 0 (c) ˃0 (d) ≥0

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 CSIR UGC – NET JRF: December 2018: Chemical Science 681

Q.105 Difference of average values of position ˂x˃ for states n = 1 and n = 2 of a particle confined in a one-
dimensional (x) box of length L is:

(a) L/4 (b) L/2 (c) L/3 (d) 0

Q.106 The Hermitian operator among the following is:

(a) 𝑑2 (b) 𝑑 (c) 𝑖ħ𝑥 (d) 𝑖ħ

𝑖ħ −𝑖ħ
𝑑𝑥 2 𝑑𝑥

Q.107 The translational partition function for Ar confined to a volume of 1L at 300 K, having thermal
wavelength of 1.60 × 10‒11 m, is closest to

(a) 24.4 × 1029 (b) 2.44 × 1029 (c) 0.244 × 1029 (d) 244 × 1029

Q.108 Consider a phase transition between two incompressible phases. The correct statement among the
following is:

(a) The transition is independent of pressure.

(b) The transition is independent of temperature.

(c) The enthalpy of such transition is always zero.

(d) The enthalpy of such transition is always non-zero.

Q.109 The third and fourth lines in the rotational Raman spectrum of CO are separated by 8 cm ‒1. The CO
bond length is given by:

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

ℎ 3ℎ ℎ 5ℎ
√ √ √ √
16𝜋 2 𝜇𝑐 32𝜋 2 𝜇𝑐 32𝜋 2 𝜇𝑐 32𝜋 2 𝜇𝑐

Q.110 Conductivities of water and a saturated solution of a sparingly soluble salt AB2 are 7 and 21 μS m‒1,
respectively. Given, 𝜆𝐴02+ = 12.72 mS m2 mol‒1 and 𝜆0𝐵− = 7.64 mS m2 mol‒1, the solubility of AB2 in mol m‒3,
is

(a) 5.0 × 10‒4 (b) 5.0 × 10‒3 (c) 5.0 × 10‒5 (d) 5.0 × 10‒6

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 682 CSIR UGC – NET JRF Chemical Science Solved Papers

Q.111 The equilibrium constant of the following reaction

𝑆𝑛(𝑠) + 𝑆𝑛4+ (𝑎𝑞) ⇌ 2𝑆𝑛2+ (𝑎𝑞)
At 300 K is close to
‒1
(Given: 𝐸𝑆𝑛
0
4+ ⁄𝑆𝑛2+ = +0.15V and 𝐸𝑆𝑛2+ ⁄𝑆𝑛 = ‒0.15V: R = 8.314 JK mol ; F = 96485 C mol )
0 ‒1 ‒1

(a) 106.08 (b) 108.08 (c) 1010.08 (d) 1012.08

Q.112 Langmuir adsorption isotherm for the dissociative adsorption of D2 (p = partial pressure of D2 and k =
ratio of rate constants for adsorption and desorption) is:

(a) 𝑘𝑝 (b) 𝑘 (c) (𝑘𝑝)1⁄2 (d) 𝜃= (

𝑝
)1/2
𝜃= 𝜃= 𝜃= 1+𝑘𝑝
1 + 𝑘𝑝 1 + 𝑘𝑝 1 + (𝑘𝑝)1⁄2

Q.113 Entropy of a perfect gas is

(a) independent of V. (b) Proportional to V. (c) Proportional to lnV. (d) Proportional to V 2.

Q.114 The contour and root mean square length (in nm) of a polymer chain modelled as a random coil, with
N = 1000 and l = 150 pm, are closet to

(a) 1.50 and 47.4 (b) 15.0 and 4.74 (c) 150 and 47.4 (d) 150 and 4.74

Q.115 The free energy [A ‒ A(0)] of a system with 10 non-interacting spins (S = 1) is

(a) ‒ kBTln(3) (b) ‒ 10kBTln(3) (c) ‒ kBTln(0.3) (d) ‒ 10kBTln(0.3)

Table – 1

D2h E C2(z) C2(y) C2(x) i σ (xy) σ (xz) σ (yz) tensors

Ag 1 1 1 1 1 1 1 1 x2, y2, z2

B1g 1 1 ‒1 ‒1 1 1 ‒1 ‒1 Rz, xy

B2g 1 ‒1 1 ‒1 1 ‒1 1 ‒1 Ry, xz

B3g 1 ‒1 ‒1 1 1 ‒1 ‒1 1 Rx, yz

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 CSIR UGC – NET JRF: December 2018: Chemical Science 683

Au 1 1 1 1 ‒1 ‒1 ‒1 ‒1

B1u 1 1 ‒1 ‒1 ‒1 ‒1 1 1 X

B2u 1 ‒1 1 ‒1 ‒1 1 ‒1 1 Y

B3u 1 ‒1 ‒1 1 ‒1 1 1 ‒1 Z

Q.116 The πu-orbital of ethylene, when placed in the xy-plane with C = C bond aligned to the x-axis, transforms
according to the irreducible representation (Use Table 1)

(a) au (b) b1u (c) b2u (d) b3u

Q.117 The b1u → b2g transition in ethylene is

(a) not allowed. (b) allowed by x-polarised light.

(c) allowed by y-polarised light. (d) allowed by z-polarised light.

(use Table 1)

Q.118 A metal crystallizes with cubic close-packed structure. The sin2θ values of Bragg reflections of Miller
planes (200) and (111) are 0.18 and 0.14, respectively. The unit cell length is

(a) λ/2 (b) λ/0.2 (c) λ/0.4 (d) 0.4λ

Q.119 kuni is the effective first-order rate constant of the following unimolecular reaction

The slope and intercept of the plot of 1/ kuni vs. 1/[M] are 4 × 106 and 8 × 1011, respectively. The value of k‒
1/k2 is:

(a) 2 × 105 (b) 0.5 × 105 (c) 32 × 105 (d) 2 × 10‒5

Q.120 The decomposition mechanism of ozone is

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 684 CSIR UGC – NET JRF Chemical Science Solved Papers

If k‒1[O2] ˂˂ k2[O3], then the order of the reaction with respect to ozone is

(a) zero (b) one (c) two (d) complex

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Table of Contents
CSIR UGC – NET JRF: Model Test .............................................................................................................. 7
Chemical Science ......................................................................................................................................... 7
❖ Question Paper................................................................................................................................... 7
❖ Answer Key ..................................................................................................................................... 35
❖ Solution............................................................................................................................................ 36
CSIR UGC – NET JRF: June 2011.............................................................................................................. 42
Chemical Science ....................................................................................................................................... 42
❖ Question Paper................................................................................................................................. 42
❖ Answer Key ..................................................................................................................................... 76
❖ Solution............................................................................................................................................ 77
CSIR UGC – NET JRF: December 2011..................................................................................................... 82
Chemical Science ....................................................................................................................................... 82
❖ Question Paper................................................................................................................................. 82
❖ Answer Key ................................................................................................................................... 116
❖ Solution.......................................................................................................................................... 117
CSIR UGC – NET JRF: June 2012............................................................................................................ 122
Chemical Science ..................................................................................................................................... 122
❖ Question Paper............................................................................................................................... 122
❖ Answer Key ................................................................................................................................... 157
❖ Solution.......................................................................................................................................... 158
CSIR UGC – NET JRF: December 2012................................................................................................... 163
Chemical Science ..................................................................................................................................... 163
❖ Question Paper............................................................................................................................... 163
❖ Answer Key ................................................................................................................................... 198
❖ Solution.......................................................................................................................................... 199
CSIR UGC – NET JRF: June 2013............................................................................................................ 205
Chemical Science ..................................................................................................................................... 205
❖ Question Paper............................................................................................................................... 205
 ❖ Answer Key ................................................................................................................................... 237
❖ Solution.......................................................................................................................................... 238
CSIR UGC – NET JRF: December 2013................................................................................................... 243
Chemical Science ..................................................................................................................................... 243
❖ Question Paper............................................................................................................................... 243
❖ Answer Key ................................................................................................................................... 274
❖ Solution.......................................................................................................................................... 275
CSIR UGC – NET JRF: June 2014............................................................................................................ 280
Chemical Science ..................................................................................................................................... 280
❖ Question Paper............................................................................................................................... 280
❖ Answer Key ................................................................................................................................... 314
❖ Solution.......................................................................................................................................... 315
CSIR UGC – NET JRF: December 2014................................................................................................... 320
Chemical Science ..................................................................................................................................... 320
❖ Question Paper............................................................................................................................... 320
❖ Answer Key ................................................................................................................................... 357
❖ Solution.......................................................................................................................................... 358
CSIR UGC – NET JRF: June 2015............................................................................................................ 364
Chemical Science ..................................................................................................................................... 364
❖ Question Paper............................................................................................................................... 364
❖ Answer Key ................................................................................................................................... 402
❖ Solution.......................................................................................................................................... 403
CSIR UGC – NET JRF: December 2015................................................................................................... 409
Chemical Science ..................................................................................................................................... 409
❖ Question Paper............................................................................................................................... 409
❖ Answer Key ................................................................................................................................... 442
❖ Solution.......................................................................................................................................... 443
CSIR UGC – NET JRF: June 2016............................................................................................................ 449
Chemical Science ..................................................................................................................................... 449
 ❖ Question Paper............................................................................................................................... 449
❖ Answer Key ................................................................................................................................... 487
❖ Solution.......................................................................................................................................... 488
CSIR UGC – NET JRF: December 2016................................................................................................... 494
Chemical Science ..................................................................................................................................... 494
❖ Question Paper............................................................................................................................... 494
❖ Answer Key ................................................................................................................................... 531
❖ Solution.......................................................................................................................................... 532
CSIR UGC – NET JRF: June 2017............................................................................................................ 538
Chemical Science ..................................................................................................................................... 538
❖ Question Paper............................................................................................................................... 538
❖ Answer Key ................................................................................................................................... 571
❖ Solution.......................................................................................................................................... 572
CSIR UGC – NET JRF: December 2017................................................................................................... 577
Chemical Science ..................................................................................................................................... 577
❖ Question Paper............................................................................................................................... 577
❖ Answer Key ................................................................................................................................... 609
❖ Solution.......................................................................................................................................... 610
CSIR UGC – NET JRF: June 2018............................................................................................................ 615
Chemical Science ..................................................................................................................................... 615
❖ Question Paper............................................................................................................................... 615
❖ Answer key .................................................................................................................................... 647
❖ Solution.......................................................................................................................................... 648
CSIR UGC – NET JRF: December 2018................................................................................................... 654
Chemical Science ..................................................................................................................................... 654
❖ Question Paper............................................................................................................................... 654
❖ Answer Key ................................................................................................................................... 685
❖ Solution.......................................................................................................................................... 686
CSIR UGC – NET JRF: June 2019............................................................................................................ 691
 Chemical Science ..................................................................................................................................... 691
❖ Question Paper............................................................................................................................... 691
❖ Answer Key ................................................................................................................................... 724
❖ Solution.......................................................................................................................................... 725
CSIR UGC – NET JRF: December 2019................................................................................................... 730
Chemical Science ..................................................................................................................................... 730
❖ Question Paper............................................................................................................................... 730
❖ Answer Key ................................................................................................................................... 761
❖ Solution.......................................................................................................................................... 762