4AB › Chemistry PYQ › CSIR NET › December 2019

1. Q2 — Among SO₂(OH)F, CH₃CO₂H, LiF and H₂O, the compound(s) which behave(s) as a base in liquid HF is/are · Acids and Bases
2. Q3 — In spectrofluorimetric determination in solution · Analytical Chemistry
3. Q4 — The ion having the highest bond order is · Chemical Bonding
4. Q5 — The magnitude of bond angles in gaseous NF₃, SbF₃ and SbCl₃ follow the order · Chemical Bonding
5. Q6 — Consider the following statements for Allred-Rochow electronegativity (χAR): (i) χAR is directly proportional · Chemical Bonding
6. Q8 — For the complex shown below in non-fluxional state, the expected ³¹P{¹H} NMR resonance(s) is/are [³¹P = I = · Inorganic Spectroscopy
7. Q9 — The correct order for the rate of thermal decarboxylation of the following compounds is A B C · General Organic Chemistry
8. Q10 — The correct order of basicity of the following compounds is CH₂NO₂ (A) ₂CN (B) (C) (D) · General Organic Chemistry
9. Q11 — The correct IUPAC name for the following molecule is · General Organic Chemistry
10. Q13 — The correct order of stability of the carbocations A-C is A B C · General Organic Chemistry
11. Q14 — The correct statement about for the orientation of the bromine atoms in the most stable conformations of A · General Organic Chemistry
12. Q15 — The synthetic equivalent of given synthon is C=O · General Organic Chemistry
13. Q16 — The number of geometrical isomers of the complex [RhH(C ≡ CR)₂ (PMe₃)₃] · General Organic Chemistry
14. Q17 — The correct order of pKa of the following compounds is A B C · General Organic Chemistry
15. Q19 — The natural product that gives signal at δ 218 ppm in its ¹³ C NMR spectrum · Natural Products
16. Q20 — The frequency of O-H stretch occurs at 3600 cm⁻¹. The O-D stretch frequency (in cm⁻¹) would be closest to · Organic Spectroscopy
17. Q21 — The compound that shows peaks in the EI mass spectrum at m/z 121, 105, 77, 44 is · Organic Spectroscopy
18. Q23 — E1cb mechanism is followed in the reaction of: · Reagents, Reaction Mechanisms & Named Reactions
19. Q26 — The major product A and the byproducts B formed in the following reaction are 2. P(OMe)₃, heat A + B · Reagents, Reaction Mechanisms & Named Reactions
20. Q28 — In the following transformation, the enantiomerically pure lactone A is A B · Reagents, Reaction Mechanisms & Named Reactions
21. Q32 — The major product in the following reaction sequence is · Reagents, Reaction Mechanisms & Named Reactions
22. Q33 — The structure of A in the following reaction is A [2. NaOEt, EtOH]1. i) hν ii) O₃, Me₂S · Reagents, Reaction Mechanisms & Named Reactions
23. Q34 — The correct sequence of reactions involved in the following transformation is: · Reagents, Reaction Mechanisms & Named Reactions
24. Q36 — The oxidation of NO to NO₂ occurs via the mechanism given below. 2NO k₋₁k₁⇌ N₂O₂; N₂O₂ + O₂ k₂ 2NO₂ · Chemical Kinetics
25. Q37 — Substance 'A' is exposed to 600 nm, 100 W light source for 6626 s, with 50% of the incident light being · Chemical Kinetics
26. Q38 — For the electrochemical cell Ag|AgCl|MCl(0.01 M)|MCl(0.02 M)|AgCl|Ag, the junction potential is the highest · Electrochemistry
27. Q39 — The electrolyte solution that has the smallest Debye-length at 298 K is · Electrochemistry
28. Q40 — A cube does not have the symmetry element · Group Theory
29. Q41 — The reducible representation Γ, in the table is equal to the following superposition of the irreducible · Group Theory
30. Q42 — The observed IR spectrum of BCl₃ exhibits three bands at 995, 480 and 244 cm⁻¹, while the Raman bands are · Group Theory
31. Q43 — Given the matrices for C₃ and σh below C₃ = -1/2 -√(3/2) 0 √(3/2) -1/2 0 0 0 1 σh = 1 0 0 0 1 0 0 0 1 the · Group Theory
32. Q44 — The molar residual entropy (in J/K) for solid OCS is close to · Gaseous State
33. Q45 — A monoatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Gaseous State
34. Q46 — The atomic masses of fluorine and hydrogen are 19.0 and 1.0 amu, respectively (1 amu = 1.67 × 10⁻²⁷ kg). The · Molecular Spectroscopy
35. Q48 — Using standard equation for intrinsic viscosity [η]=KMva for a solution of polymer and any information from · Polymer Chemistry
36. Q50 — A liquid of density 1.1 g cm⁻³ climbs to a height of 5.0 cm when a capillary with internal radius of 0.2 mm · Surface Chemistry
37. Q51 — The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant · Surface Chemistry
38. Q52 — Consider the entropy changes in a system undergoing transformation, as depicted in the diagram, below The · Thermodynamics
39. Q53 — Molar composition of a mixture of P and Q at equilibrium is 3:1 (P:Q). A small disturbance in composition · Thermodynamics
40. Q55 — A monatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Thermodynamics
41. Q56 — The excess molar entropy of mixing of liquid A with liquid B is -Rln 2. The experimentally observed change in · Thermodynamics
42. Q57 — Choose the equilibria from the following that are NOT favoured to go to right (A) As₂S₅+5HgO gives As₂O₅+5HgS · Acids and Bases
43. Q58 — Among SO₂(OH)F, CH₃CO₂H, LiF and H₂O, the compound(s) which behave(s) as a base in liquid HF is/are · Acid and Bases
44. Q59 — The pair of light source and atomizer resulting highest sensitivity to atomic absorption spectrometric · Analytical Chemistry
45. Q60 — Inspectrofluorimetric determination in solution A. absorbance of analyte solution is kept near to 0.05 B · Analytical Chemistry
46. Q61 — Match the items in column I with those of column II Correct match is · Analytical Chemistry
47. Q62 — Choose the correct statements for oxymyoglobin and cytochrome P₄₅₀ (resting state) from the following: A · Bioinorganic Chemistry
48. Q63 — The correct match for the drug molecules in the Column A with their medicinal use in Column B is Column A P Q · Bioinorganic Chemistry
49. Q64 — Complex(es) which has/have unpaired electron(s) that is equal to that of iron center in oxymyoglobin is/are · Bioinorganic Chemistry
50. Q65 — Match Column I, II and III The correct match is · Bioinorganic Chemistry
51. Q66 — In the catalytic cycle of Cytochrome P₄₅₀, the generation of [(porphyrin)+FeIV(O)] from · Bioinorganic Chemistry
52. Q67 — The ion having the highest bond order is · Chemical Bonding
53. Q68 — The magnitude of bond angles in gaseous NF₃, SbF₃ and SbCl₃ follow the order · Chemical Bonding
54. Q69 — The species for which the shapes (geometry) can be predicted by VSEPR theory is/are (A) [PtCl₄]²⁻ (B) · Chemical Bonding
55. Q70 — Choose the correct order of energy of 2 σg and 1 π₀ molecular orbitals for B₂, C₂ and O₂ : · Chemical Bonding
56. Q72 — The total bond order between adjacent carbon atoms of benzene is · Chemical Bonding
57. Q74 — For the complex shown below in non-fluxional state, the expected ³¹P{¹H} NMR resonance(s) is/are [³¹P = I = · Inorganic Spectroscopy
58. Q75 — In Mossbauer spectrum of a sample containing iron recorded in the presence of a static magnetic field, the · Inorganic Spectroscopy
59. Q76 — Pair of lanthanide ions which show significant deviation between the experimental and calculated magnetic · Lanthanides and Actinides
60. Q77 — The pair in which both actinides show +3 oxidation state only is · Lanthanides and Actinides
61. Q78 — The correct match for column A with column B is : · Lanthanides and Actinides
62. Q79 — The common heptacity observed for coordination of C₆₀ to a metal center is · Main Group Elements
63. Q80 — Match the items in Column I with those of Column II The correct match is. · Main Group Elements
64. Q82 — The correct statements for dithionite and dithionate anions from the following are (A) both have S-S bond (B) · Main Group Elements
65. Q83 — Correct statement/s among the following with respect to ionization energy (IE) is/are (i) (IE₁+IE₂+IE₃) for · Main Group Elements
66. Q84 — The reason for significantly high solubility of AgClO₄ in benzene than in alkane solvents is · Main Group Elements
67. Q85 — Choose the correct statements for the Group 15 halides: (i) AsCl₃ can form complexes of type [AsCl₄]⁻in the · Main Group Elements
68. Q86 — The reaction of XeF₆ with a limited amount of quartz gives compound A. Then on reaction with an equivalent · Main Group Elements
69. Q88 — The expected number of co bands in the IR spectra of fac- [Mo (PPh₃)₂(CO)₃] and trans- [Mo(PPh₃)₂(CO)₄] are · Organometallic Compounds
70. Q89 — The most stable vanadium species in aqueous medium is · Organometallic Compounds
71. Q90 — The correct order of metal-carbon distance is · Organometallic Compounds
72. Q91 — The rate-determining step in the catalytic synthesis of acetic acid by Monsanto process is · Organometallic Compounds
73. Q92 — The cluster types of [Fe₅(CO)₁₄ N]⁻and [Co₆(CO)₁₃ N]⁻are, respectively, · Organometallic Compounds
74. Q93 — The main product of nucleoplallic attack of H⁻ on the complex ion given below is · Organometallic Compounds
75. Q94 — The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is · Organometallic Compounds
76. Q95 — Among the following complexes, the one showing the highest rate of substitution of a CO ligand on heating · Organometallic Compounds
77. Q97 — In IR spectrum, recorded neat, a compound shows a strong and broad band at 3300 cm⁻¹. The band becomes sharp · Organic Spectroscopy
78. Q98 — The correct match of ¹³C NMR chemical shift values (δ ppm) for pyridine is · Organic Spectroscopy
79. Q99 — The frequency of O-H stretch occurs at 3600 cm⁻¹. The O-D stretch frequency (in cm⁻¹) would be closest to · Organic Spectroscopy
80. Q100 — The structure of the compound which displays the following spectral data is IR = 1690, 1100 cm⁻¹ ¹H NMR: δ · Organic Spectroscopy
81. Q101 — The natural product that gives a signal at 218 ppm in its ¹³C NMR spectrum is · Organic Spectroscopy
82. Q102 — The correct order of carbonyl stretching frequency of the given compounds is A B C · Organic Spectroscopy
83. Q104 — The intermediate A and the major product B, formed in the following reaction are [A] Δ [B] · Pericyclic Reactions
84. Q106 — The following transformation involves a series of + + CO₂ · Pericyclic Reactions
85. Q109 — A monoatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Atomic and Molecular Term Symbol
86. Q110 — Which of the following will result in deviation from Beer's law ? 1. Change in refractive index or medium. 2 · Chemical Kinetics
87. Q114 — For the electrochemical cell Ag | AgCl | MCl (0.01 M) | MCl (0.02 M) | AgCl | Ag, the junction potential is · Electrochemistry
88. Q115 — The E₀(M⁺/M) of the cell, SHE | MX | M can be obtained from the plot of (Ecell is the cell potential and m is · Electrochemistry
89. Q117 — If the rate constant for a base catalyzed ester hydrolysis reaction is 0.20 L mol⁻¹s⁻¹, half-life (in s) of · Chemical Kinetics
90. Q119 — The oxidation of NO to NO₂ occurs via the mechanism given below 2NO k₋₁k₁⇌ N₂O₂ N₂O₂ + O₂ k₂ 2NO₂ (d · Chemical Kinetics
91. Q122 — For a reaction, raising the temperature from 200 K to 300 K results in the increase of rate constant by a · Chemical Kinetics
92. Q125 — The following is the character table for the C2 v point group There are two functions f₁ and f₂ belonging to · Group Theory
93. Q127 — Given the matrices for C₃ and σh below C₃= -1/2 -(√(3))/2 0 (√(3))/2 -1/2 0 0 0 1 σh= 1 0 0 0 1 0 0 0 1 the · Group Theory
94. Q128 — For every atom that is NOT shifted under C₄ and σ symmetry operations, the characters are respectively. · Group Theory
95. Q129 — The equivalent symmetry operations for S₆³ and S₃⁶ are, respectively · Group Theory
96. Q130 — An AX system gave 4 lines at 4.72, 4.6, 1.12 and 1.0 ppm away from the TMS using an nmr spectrometer · Molecular Spectroscopy
97. Q131 — The molecule with the smallest rotation partition function at any temperature among the following is: · Molecular Spectroscopy
98. Q132 — The frequency of O – H stretch occurs at ~ 3600 cm⁻¹. The O – D stretch frequency (in cm⁻¹) would be closest · Molecular Spectroscopy
99. Q133 — In the pure rotational microwave spectrum of a XY molecule, the adjacent lines are separated by 4 cm⁻¹. If · Molecular Spectroscopy
100. Q134 — The equilibrium dissociation energy of a diatomic molecule is 4.75 eV and its stretching frequency · Molecular Spectroscopy
101. Q135 — The vibrational transition energies of a diatomic molecule corresponding to v = 1 ← v = 0 and v = 2 ← v = 1 · Molecular Spectroscopy
102. Q137 — In a polymer of N monomer units, the root mean square separation between the two ends is proportional to · Polymer Chemistry
103. Q138 — The degree of polymerization at t = 10 h of a polymer formed by a stepwise process with polymerization rate · Polymer Chemistry
104. Q139 — Using standard equation for intrinsic viscosity [η]=KMva for a solution of polymer and any information from · Polymer Chemistry
105. Q140 — A sample of polysterene is composed of three weight fractions: 0.20,0.50 and 0.30. The molecular weight of · Polymer Chemistry
106. Q141 — The Miller index for the plane as shown in the figure and parallel to the c-axis, is · Solid State Chemistry
107. Q142 — X-rays of 173 pm wavelength are reflected by the (111) plane of a cubic primitive crystal at θ = 30°. The · Solid State Chemistry
108. Q143 — Iron belongs to the BCC lattice. The Miller indices of the second allowed reflection in the powder · Solid State Chemistry
109. Q144 — In the ccp packing, the number of lattice points per unit area in the planes is in the order · Solid State Chemistry
110. Q145 — Consider a two-level system in which the excited state, separated from the ground state by energy ε, is · Statistical Thermodynamics
111. Q146 — The molar residual entropy (in J K⁻¹) of solid OCS would be closest to · Statistical Thermodynamics
112. Q148 — A liquid of density 1.1 g cm⁻³ climbs to a height of 5.0 cm when a capillary with internal radius of 0.2 mm · Surface Chemistry
113. Q149 — The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant · Surface Chemistry
114. Q150 — The correct statement about chemisorption is · Surface Chemistry
115. Q151 — A gas is known to satisfy Langmuir isotherm when adsorbed on a certain metal surface. If the fractional · Surface Chemistry
116. Q152 — The surface tension of dilute soap solution is lower than that of pure water because · Surface Chemistry
117. Q153 — Consider the entropy changes in a system undergoing transformation, as depicted in the diagram, below The · Thermodynamics
118. Q154 — Molar composition of a mixture of P and Q at equilibrium is 3 : 1 (P : Q). A small disturbance in composition · Thermodynamics
119. Q156 — (Cp - Cv) for a non-ideal gas differs from (Cp - Cv) for a perfect gas by the expression (1) ((∂ P)/(∂ T))V · Thermodynamics
120. Q157 — A monatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Thermodynamics
121. Q158 — For a van der Waals gas, the partial derivative is ((∂ U)/(∂ V))T · Thermodynamics
122. Q159 — The change in chemical potential (in J) of one mole of an ideal gas, when it is compressed isothermally at · Thermodynamics

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