| Post Name | SCIENTIFIC OFFICER (CHEMISTRY) - Police (Forensic Science Laboratory) |
|---|---|
| Question Paper Code | 163/2024 |
| Category Code | 633/2023 |
| Date of Test | 21 November 2024 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Which of the following is a hard acid ?
Answer
A. K+
2
The bond dissociation energy is maximum for
Answer
B. Cl2
3
Apoenzyme c. Non-protein component permanently attached
to the enzyme
Answer
B. 1 – a, 2 – b, 3 – c
4
Hofmann-Löffler-Freytag Reaction d. Photochemical (2+2) cycloaddition
between a carbonyl group and an
alkene
Answer
A. 1 – b, 2 – d, 3 – c, 4 – a
5
______________ belong to the class of three dimensional aluminosilicate.
Answer
A. Feldspar
6
Trace amount of ____________ is necessary in diet for maintaining correct level of
glucose in blood.
Answer
C. Cr
7
The CFSE of [Fe(CN)6]3– is
Answer
C. – 2.0 ∆o
8
The bonding present between Nitrogen and Phosphorous in phosphonitrilic
compound is
Answer
Question Cancelled
9
Which of the following ions give colourless salts ?
Answer
A. Ce3+
10
Each question is provided with four choices
Answer
C. and
11
The ground state term symbols for Sc2+ and Ni2+ ions are respectively
Answer
B. 2d and 3F
12
When NO+ ion is reduced to neutral N-O molecule, what happened to bond order
and N-O stretching frequency ?
Answer
D. Bond order and N-O stretching frequency decreases
13
The hyperfine splitting in ESR is due to the interaction of electron spin with nuclear spin.
The selection rules which govern hyperfine transition in ESR spectroscopy are
Answer
C. ∆ms = ± 1 and ∆mI =
14
The 11B NmR spectrum of BH4– ion consists of (nuclear spin of 11B and 1H are 3/2
and 1/2 respectively)
Answer
A. A quintet with intensity ratio 1 : 4 : 6 : 4 :
15
Which among the following complex ion exhibit lowest
Answer
D. [Ti(CO)6]2 –
16
Select the appropriate option regarding the quadrupole splitting in the mossbauer
spectrum of ferricyanide and ferrocyanide ions.
Answer
B. Ferricyanide ion exhibit quadrupole splitting, whereas ferrocyanide do not
17
The point group to which Ferrocene in its staggered form belongs is
Answer
B. d5d
18
In [Re2Cl8]2– the bond is formed by the sideways overlap of
Answer
Question Cancelled
19
Which of the following pairs is not isolobal ?
Answer
Question Cancelled
20
Which of the following is the correct order of CO stretching frequency for metal
carbonyls ?
Answer
A. mCO > m2CO > m3CO
21
Which among the following pair is magic numbers for closed nuclear shells ?
Answer
C. 50,
22
The only metal known to exist in a simple cubic lattice form
Answer
B. Polonium
23
Which among the following electrolytes is not employed in a Solid Oxide Fuel Cell
(SOFC) ?
Answer
Question Cancelled
24
Which among the following statements is not true about ZEBRA batteries ?
Answer
C. Operating temperature below 0°C
25
The type of semiconduction shown by
Answer
A. boron-doped silicon and
26
Which of the following colour centres occurs as a result of
Answer
D. H-centre
27
What is the chemical composition of the widely used ferroelectric material PZT ?
Answer
B. lead Zirconium Titanate
28
The lattice systems for which α ≠ β ≠ γ ≠ 90°, a ≠ b ≠ c and α = β = γ = 90°, a ≠ b ≠ c
are respectively
Answer
B. Triclinic and Orthorhombic
29
In a cubic crystal both 111 and 200 reflections are present but not 100. What is the
Bravais lattice ?
Answer
D. F
30
Silsbee effect is
Answer
C. When the current in a superconductor exceeds a critical value, the
superconductivity is destroyed
31
Which of the following reaction is/are not correctly associated with SN1 reaction ?
i. Reaction proceed with racemisation.
ii. Strong nucleophile favours SN1 reaction.
iii. SN1 reaction proceed more rapidly in aprotic solvent like dmF, dmSO than water
and alcohol.
iv. Rearrangement takes place in SN1 mechanism.
Answer
B. Only ii and iii
32
lindlar’s catalyst is
Answer
B. Pd on CaCO3
33
The reagent used for the conversion of
O
Answer
A. NH2NH2, C2H5ONa
34
Which of the following reactions gives carbene as intermediate ?
i. CH N hυ
2 2
Ph
ii. HgO
C = N – NH2
Ph hυ
hυ
iii. Ph – C – C = N+ = N–
O Ph
iv. CH – N = N+ = N– hυ
Answer
C. Only i, ii and iii
35
Which of the following compound is not aromatic ?
Answer
A. [10] annulene
36
Which of the following reaction is used for synthesis of α-pinene from ethyl pinonate
and α haloester ?
Answer
B. darzen condensation
37
Order of reactivity of the following alkyl halide for SN2 reaction in methanol solution is
Answer
C. CH3I > CH3Br > CH3Cl > CH3F
38
IUPAC name of
Answer
C. bicyclo [2.2.1] heptane
39
Assign R and S descriptors to I and II.
Br OH
H3C
H3C
OH Br
I II
Answer
Question Cancelled
40
The cyclization of dinitrile in the presence of base is
Answer
B. Thorpe reaction
41
The Gilman reagent is
Answer
C. lithium dialkyl copper
42
Which of the following statement is correct for Beckmann rearrangement ?
i. Beckmann rearrangement take place with retention of configuration.
ii. It is a base catalysed transformation of a ketoxime to N-substituted amide.
iii. The rearrangement is highly stereospecific.
iv. Reaction is used for enlargement of rings.
Answer
C. Only i, iii and iv
43
Reaction of α-haloketone with alkoxide gives rearranged ester. This reaction is
known as
Answer
A. Favorskii rearrangement
44
Which among the following is/are correct for 1, 3-dithiane ?
Answer
D. All of the above
45
Quarternary ammonium ion which contain β-hydrogen atom undergo Hofmann
elimination with base is known as
Answer
A. Stevens rearrangement
46
Catalyst used in Suzuki coupling is
Answer
B. Pd
47
The coupling of terminal alkyne with vinyl halide under palladium catalyst is
Answer
D. Sonogashira coupling
H
CN
48
A stereodefined substituted cyclohexane bearing a –CH(CH₃)CH₂CN side chain and an exocyclic isopropenyl group is treated with DIBAL at −70 °C, followed by H₂O. The product of the reaction is:
Answer
C. The same carbon skeleton with the nitrile-derived terminus converted to –CHO
49
Chromic anhydride in Conc.H2SO4 and water is called
Answer
C. Jones reagent
50
The correct statement about Hammett equation is
Answer
B. The more positive the charge induced on the ring by a substituent the larger its
Hammett substituent constant (σ)
51
Which of the following statements about photophysical processes are true ?
I. Internal conversion is responsible for the non-radiative loss of energy between
different vibrational levels of the same electronic state.
II. Intersystem crossing is more likely to occur in molecules containing heavy
atoms, such as bromine or iodine.
III. Phosphorescence typically occurs on a timescale of nanoseconds.
IV. Both fluorescence and phosphorescence involve radiative transitions.
Answer
Question Cancelled
52
In 13C NmR, the signal intensity is generally lower than in 1H NmR because
Answer
D. All of the above
53
Match the following reactions with their key features :
Reactions Features
1. Norrish Type | a. Radical cyclization of halogenated
amines
2. Norrish Type II b. Cleavage of the bond
3. Paterno-Buchi reaction c. Cleavage of the bond f-to the carbony!
group followed by intermolecular
hydrogen abstraction
4. Hofmann-Léffler-Freytag Reaction d. Photochemical (2+2) cycloaddition
between a carbonyl group and an
alkene
Answer
C. 1-b,2-c,3-d,4-a
54
What is the primary feature of sigmatropic rearrangements ?
Answer
B. Concerted mechanism with no intermediates
55
Match the following terms with their correct descriptions :
Column -— | Column - Il
1. Prosthetic group a. Active enzyme consisting of both protein and
non-protein components
2. Holoenzyme b. Protein part of an enzyme without its non-protein
component
3. Apoenzyme c. Non-protein component permanently attached
to the enzyme
Answer
A. 1-c, 2-a, 3-b
56
The IR spectrum of an organic compound shows a broad band near 3300 cm–1 when
recorded neat, but becomes sharp and shifts to 3600 cm–1 when recorded in dilute
benzene. This indicates
Answer
C. The compound has intermolecular hydrogen bonding, likely from an OH group
57
In the context of lanthanide shift reagents, what does “pseudo contact shift ” refer to ?
Answer
B. Shifts influenced by the paramagnetic nature of the lanthanide
58
The type of bond that links nucleotides together in a ribonucleic acid (RNA) strand is
Answer
D. Phosphodiester bonds
59
The primary purpose of Ziegler-Natta catalysts in polymer chemistry is
Answer
B. To catalyze the polymerization of alkenes
60
Which of the following alkaloids is isolated from the opium poppy plant ?
Answer
B. morphine
61
Which of the following statements are correct in the light of phase rule ?
i. The degree of freedom in case of a pure substance at its critical point is zero.
ii. Critical temperature and critical pressure are fixed at critical point for a pure
substance.
iii. The degree of freedom in case of a pure substance at its critical point is one.
Answer
A. i and ii
62
What is the work done when 100 g of iron reacts with HCI in a closed vessel (volume
constant) ? Atomic weight of iron = 56.
Answer
B. 0
63
Which phase equilibria is involved in distillation method of separation ?
Answer
C. liquid-vapour
64
Choose the wrong statement.
Answer
D. Restriction in the number of particles in a given quantum state is in Bose Einstein
Statistics
65
Which of the following is not a transport phenomenon ?
Answer
D. None of these
66
The phenomenon of enhanced conductance at high potential is called
Answer
C. Wien effect
67
Select the wrong statement.
Answer
B. Noise levels of fuel cells are very high
68
Cubic close packing of n spheres generates the following number of interstitial
sites.
Answer
D. n Octahedral and 2n tetrahedral sites
69
For a first order reaction, the half life is 50 seconds. Identify the correct statement
from the following.
Answer
D. None of the above
70
Choose the correct set of miller indices for the planes with intercept along cartesian
co-ordinate axes.
i) OA = a, OB = 2a, OC= a and ii) OA = a, OB = a/2, OC= a/2 from the below given
options.
Answer
Question Cancelled
71
For a gas phase reaction NO2 ⇔ = NO + ½ O2, InKp (700K) = – 0.854 and
InKp(600K) = – 2.172. Calculate the enthalpy change for this reaction.
Answer
B. 45.67 kJ
72
The cell diagram for the electro chemical cell with the following chemical reaction is
H2(g) + Hg2Cl2(s) = = = = 1HgCI
Answer
C. Pt / H2 /HCI/Hg2Cl2/Hg/Pt
73
The commonly used cell as standard for calibration of potentiometers is
Answer
B. Weston cell
74
The ionic strength of a 5.22 × 10–4 m Na3PO4 solution is
Answer
B. 3.132 × 10–3 m
75
The phenomenon in which molecules escape through a small opening without
disturbing the equilibrium distribution is
Answer
C. effusion
76
The technique of breaking the molecules with intense pulse of light and monitoring
the subsequent reactions is called
Answer
B. Flash photolysis
77
The point at the centre of contour map of potential energy surface is
Answer
B. Saddle point
78
Pick the correct statement which is true for a first order reaction.
Answer
A. Half life is independent of initial concentration
79
Choose the correct statement which is true from below.
Answer
A. mean free path of a gas molecule is inversely proportional to pressure
80
The high specific heat capacity and high surface tension of water is due to the
presence of
Answer
D. Inter molecular hydrogen bonding
81
The variation in the polarizability ellipsoid corresponding to the symmetric stretching
of CO2 can be shown as
α α
Answer
B. α0
–ξ 0 +ξ –ξ 0 +ξ
α α
82
The observed electronic spectral transitions of Cu2+ systems in distorted octahedral
environment can be
Answer
C. 2B2g ← 2B1g and 2Eg ← 2B1g
83
Allene and Ethane (staggered) belong to ____________ and ___________ point
groups respectively.
Answer
D. d2d and d3d
84
Which among the following is expressed by the relation nRT2(∂lnq /∂T)v ?
Answer
A. Internal Energy
85
For N particles, each with g possible one particle states accessible, the number of
N-particle states accessible to the system for bosons is given by
Answer
D. Ω = (g + N – 1)!/N!(g – N)!
86
A Gaussian 6 – 31 G∗ calculation on CH2 uses ___________ basis functions.
Answer
C. 19
87
The degree of degeneracy of the energy level 14h2/8ma2 of particle in 3d box is
Answer
B. 6
88
E = A2 + 4A – 3 corresponds to the approximate energy of a system where A is the
vibrational parameter. Value of A leads to the minimum energy and that minimum
energy are _________ and ___________ respectively.
Answer
C. – 2 and –
89
As per Pauli’s exclusion principle, which among the following combinations correctly
represent the ground state of He atom ?
Answer
B. 1s(1) 1s(2) (1/ 2 ) [α(1) β(2) – α(2) β(1)]
90
What is the ground state term symbol of free Fe2+ ion ?
Answer
A. 5d4
91
The lycurgus cup appears green when
Answer
D. light is reflected
92
Which crown ether exhibits affinity for sodium ion ?
Answer
D. 15-Crown-5
93
How many significant figures are there in the numbers 0.001204000 and 0.001204
respectively ?
Answer
C. 7,
94
The apparatus used to determine surface tension is
Answer
A. stalagmometer
95
An example for halochromic material is
Answer
B. methyl orange
96
An example for 1d nanomaterial is
Answer
Question Cancelled
97
The dark organic material in soil which is formed by the decomposition of plant and
animal matter is
Answer
C. humus
98
Which parameter is measured using differential scanning calorimetry ?
Answer
D. dH
99
meteorites burn up in which layer while entering earth’s atmosphere
Answer
B. mesosphere
100
The basic principle of column chromatography is
Answer
A. adsorption
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