| Post Name | Junior Research Officer (SR for ST) - Food Safety |
|---|---|
| Question Paper Code | 137/2023/OL |
| Category Code | 034/2022 |
| Date of Test | 4 August 2023 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
The pairs of sulfur-nitrogen compounds/species with 10π electrons
Answer
B. [S₄N₄]²⁺, [S₃N₃]⁻
2
Which of the following organometallic compound has a 4c-2e bond if the bonding is purely covalent?
Answer
C. Li₄Me₄
3
Which of the following adopts inverse spinel structure?
Answer
D. MgIn₂O₄
4
NH₄Cl reacts with BCl₃ and produces a compound P, which on reduction with NaBH₄ gives Q. Q on reaction with HCl gives R. Identify P, Q and R in the correct order
Answer
C. B₃N₃Cl₃H₃, B₃N₃H₆, B₃N₃Cl₃H₉
5
Which one of the following is not a zeolite?
Answer
A. Crocidolite
6
Which is a p-type semiconductor among the following?
Answer
C. Cr₂O₃
7
The auto ionization products of ICl₃ are
Answer
B. ICl₂⁺ and ICl₄⁻
8
The ³¹P spectrum of facial isomer of the complex [RhCl₃(PPh₃)₃] (¹J(P−Rh) > ²K(P−P) and I value of Rh = 1/2) consists of
Answer
C. One doublet
9
The correct match for radioisotopes in column A with its medical application in column B Column A Column B (a) (i) Mechanism of bone fracture healing (b) (ii) Defects in blood circulation (c) (iii) Dopamine pathway in Brain (d) (iv) Brain Tumour Location
Answer
D. (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
10
The highest M-C bond length exhibited by [M(η⁵-Cp)₂] complex is
Answer
C. [V(η⁵-Cp)₂]
11
The correct order of isomeric shift in Sn compounds
Answer
D. [Me₂SnCl₂] > [Me₃SnCl] > [Me₄Sn]
12
Estimate the radius of ²³⁴Th nucleus
Answer
B. 9.24 × 10⁻¹⁵ m
13
The X-S-X bond angle in SO₂X₂ for different X is the order when X = F, Cl, OH or CF₃
Answer
A. SO₂(CF₃)₂ > SO₂(OH)₂ > SO₂Cl₂ > SO₂F₂
14
The correct combination of catalyst and its application is
Answer
C. Cis - - Monsanto acetic acid synthesis
15
The one-dimensional metal Pt complex is
Answer
A. K₂Pt(CN)₄Br₀.₃·3H₂O
16
The STYX number of is
Answer
B. 4220
17
The correct match for metalloprotein in column A with its biological function in column B. Column A Column B (a) Cytochrome P450 (i) transport (b) Vitamin (ii) Storage (c) Rubredoxin (iii) Group transfer (d) Hemocyanin (iv) Electron transport (v) Iron storage (vi) Insertion of oxygen into C-H bond
Answer
A. (a)-(vi), (b)-(iii), (c)-(iv), (d)-(i)
18
Which one of the following is/are a single molecular magnet?
Answer
D. All the above
19
The ground state term symbols for and are
Answer
A. and
20
is isolobal with
Answer
B. and
21
Which of the following statement is/are correct about Ferro, Piezo- and Pyroelectric materials (i) The crystal of Ferro-, Piezo- and Pyroelectric crystals are non-centrasymmetric (ii) All piezoelectric materials are pyroelectric (iii) Ferroelectric materials are also pyroelectric and piezoelectric
Answer
B. Only (i) and (iii)
22
The correct order of ligand reactivity for substitution of Cl on trans-[Pt(Py)₂Cl₂] by the ligand Y in methanol (where the ligand Y is PR₃, SCN⁻, Br⁻ and NH₃) is
Answer
C. PR₃ > SCN⁻ > Br⁻ > NH₃
23
The electronic spectrum of [Ni(H₂O)₆]²⁺ appears at 8500, 13800 and 25300 cm⁻¹. The energy transition corresponding to 8500 cm⁻¹ is
Answer
A. ³A₂g(F) → ³T₂g(F)
24
Which one of the following is Scherrer formula to determine the crystallite size of a material from XRD?
Answer
A. t = 0.9λ/(B cos θ_B)
25
The Lande g-factor for is
Answer
D. 0.8
26
Which of the following pairs have Arachno structures?
Answer
C. and
27
Which is the most commonly used activator ion for use in red phosphors for colour television screens?
Answer
C. Eu³⁺
28
Identify the end product B is the following reaction sequence:
Answer
B. Cis -
29
The correct order of basicity of phosphines is
Answer
D. PEt₃ > PPh₃ > P(OPh)₃ > PF₃
30
Which is the correct option about the type of intrinsic defect observed in (i) MgO and (ii) CdTe?
Answer
B. i- Schottky Defect, ii- Frenkel Defect
31
The IUPAC name of the following compound is
Answer
B. Spiro [4.5] deca-1,6-diene
32
Which is the same compound as the following stereochemical structure?
Answer
D. Official stereochemical drawing D of 2-butanol shown in the source
33
Which statement about the following compound is correct?
Answer
C. Optically active due to restricted rotation
34
Which of the following is incorrect for sydnones?
Answer
D. None of the above
35
The major product of the illustrated chiral aldehyde reaction with EtMgBr will be
Answer
A. Official stereochemical alcohol product 1 shown in the source
36
Which among the following alkyl chlorides has the highest rate of hydrolysis through unimolecular mechanism?
Answer
C. Benzyl chloride, C₆H₅CH₂Cl
37
Addition of bromine to alkene is
Answer
B. Stereospecific
38
Identify the following reaction
Answer
C. Mitsunobu reaction
39
Product of the illustrated spiro-compound reaction with methyl vinyl ketone followed by H₂O is
Answer
A. Official fused bicyclic diketone product A shown in the source
40
Witting reaction is used for the conversion of
Answer
C. Ketone to alkene
41
Which among the following rearrangement proceeds through nitrene intermediate?
Answer
D. All the above
42
Identify Favorskii rearrangement in the following
Answer
C. α-Chlorocyclohexanone with NaOH giving cyclopentanecarboxylic acid
43
Product of the illustrated cyclohexene reaction with N-bromosuccinimide in CCl₄ is
Answer
A. Allylic bromocyclohexene shown in the source
44
Lithium aluminium hydride reduces a nitrile to
Answer
B. Amine
45
What is Jones reagent?
Answer
B. CrO₃ in aqueous H₂SO₄
46
Which of the following reaction proceeds through umpolung?
Answer
D. Benzoin condensation
47
The catalyst for Suzuki coupling is
Answer
C. Palladium (0) complex
48
Lithium dialkyl cuprate is known as
Answer
C. Gilman reagent
49
Which is the protecting group used for amino protection in peptide synthesis?
Answer
D. All the above
50
Which among the following is not using as phase transfer catalyst?
Answer
D. None of the above
51
Which among the following is a cause of high quantum yield of photochemical reactions
Answer
C. Occurrence of chain reaction per photon absorption
52
What is the product of photoreaction of 1,3-butadiene under the illustrated conditions?
Answer
D. All the above
53
Which among the following statements is incorrect for Patterno-Buchi reaction
Answer
B. Reaction is between an excited an alkene reacting with the ground state carbonyl group
54
Rhodospin is a combination of ________ and protein opsin
Answer
A. 11-cis-retinal
55
Which is the main product of the illustrated thermal rearrangement of the allyl phenyl ether?
Answer
B. Official ortho-alkenyl phenol product B shown in the source
56
Which one is correct as per selection rule of Electrocyclic reactions
Answer
B. system, thermally conrotatory
57
Edman's reagent for protein sequencing is
Answer
A. Phenyl isothiocyanate
58
Which is not stereoregular?
Answer
C. Atactic
59
What is the name used to refer to the type of ion represented by: M+
Answer
A. molecular radical cation
60
Suggest the structural formula of the compound that gives two doublets with J = 3 Hz in its proton NMR spectrum
Answer
A. CH₂=C(Cl)Br structure shown in the source
61
The volume of gas at 0°C is 273 mL. Its volume at 50°C is
Answer
A. 273 + 50 mL
62
For a Van der Waals gas, the Boyle temperature, T_B =
Answer
B. a/(Rb)
63
An ionic compound AₓBᵧ occurs in FCC type crystal structure with B ions at the centre of each face and A ions occupy the corners of the cube; give the formula of AₓBᵧ
Answer
D. AB₃
64
The kerosene oil rises up in the wick of lantern because of
Answer
C. Surface tension
65
The liquid crystal phase show coloured effect is
Answer
C. Cholesteric
66
Which one of the following thermodynamic processes approximate the steaming of food in pressure cooker?
Answer
B. Isochoric
67
The number of component (C), phase (P) and degree of freedom (F) are related by Gibbs phase rule as
Answer
D. F+P=C+2
68
Four distinguishable molecules are distributed in energy levels and with degeneracy of 2 and 3 respectively. Find the number of microstates with three molecules in and one molecule in
Answer
B. 96
69
The mean total energy of a classical three-dimensional harmonic oscillator in equilibrium with a heat reservoir at temperature T is
Answer
D. 3 kT
70
In any reversible reaction, A is in equilibrium with B. If concentration of each substance is doubled, then its equilibrium constant will be
Answer
A. Remains same
71
According to Freundlich adsorption isotherm, at high pressure value of x/m will be
Answer
D. Independent of pressure
72
Where do we obtain the magnified image of the specimen in SEM?
Answer
A. Cathode ray tube
73
The electrolytic solution that is having smallest Debye length at 298 K
Answer
C. LaCl₃
74
In polarography to get true diffusion current the polarographic maxima can be eliminated by
Answer
D. Addition of small amount of surface active agents
75
The potential developed by the liquid being forced to flow through a plug or diaphragm is called
Answer
B. Streaming potential
76
The reduction potential of saturated calomel electrode at 25°C is 0.2415 V; it indicates
Answer
A. Hg₂Cl₂ + 2e⁻ → 2Hg + 2Cl⁻
77
For a reaction, the rate constant k at 27°C is 5.0 × 10¹⁰e⁻²⁰. The activation energy of the reaction is
Answer
A. 500000 J mol⁻¹
78
Consider a second order reaction; if 'a' is the initial concentration of the reactants, then the half-life period of the reaction is directly proportional to
Answer
C. 1/a
79
For a given ionic strength I, rate of reaction is given by ln(R/R₀) = −4 × 0.5 × I¹ᐟ². Which of the following reaction shows the above rate equation?
Answer
C. [Cr(NH₃)₅Br]²⁺ + OH⁻
80
When oxalic acid is oxidised by acidified potassium permanganate, the compound produced during the reaction that acts as auto-catalyst is
Answer
D. MnSO₄
81
We have , where H is Hamiltonian operator and a is eigen value, the 'a' will have dimension of
Answer
A. Energy
82
What will be the zero point energy of a particle confined in one-dimensional box of length '2a'?
Answer
C. h²/(32ma²)
83
According to Planck's theory the average energy per oscillator is
Answer
D. hν/(e^(hν/kT) − 1)
84
If the momentum of a particle is increased to four times, then the de- brogle wavelength will become
Answer
C. One fourth times
85
The point group symmetry of [PtCl₄]²⁻ is
Answer
B. D₄h
86
Which among the following molecule is expected the smallest rotational partition function?
Answer
A. H₂
87
When external magnetic field is applied to an odd mass number species, it spins on its own axis and magnetic moment produces, it creates
Answer
D. Larmor frequency
88
Which computational method is used to solve the Schrondinger equation for systems with a large number of atoms?
Answer
C. Density functional theory
89
Which law states that product of specific heat capacity and atomic weight of an element is always a constant
Answer
B. Dulong-Petit law
90
How many vibrational modes can have water molecule?
Answer
A. 3
91
If the experimental value is close to the true value, then the experimental value is
Answer
A. accurate
92
How many significant figures are there in the numbers 0.001023 and 0.001023000 respectively?
Answer
B. 4, 7
93
Which statement is true for a primary standard?
Answer
D. All of these
94
Which parameter is measured using differential thermal analysis?
Answer
B. ΔT
95
In gas chromatography, which is not used as a carrier gas?
Answer
C. Oxygen
96
An example for piezoelectric material is
Answer
A. Barium titanate
97
The chemical species responsible for the ozone layer depletion is
Answer
D. Freon
98
Which of the following synthetic method is a bottom-up approach for the synthesis of nanomaterials?
Answer
C. Sol-gel synthesis
99
The first talk on nanotechnology entitled 'There is plenty of room at the bottom in 1959 was delivered by
Answer
D. Richard Feynman
100
The repeating unit in the structure of 18-crown-6 is
Answer
C. –O–CH₂–CH₂–
Discussion
Ask a doubt or share a tip.
No comments yet — start the discussion.