4AB › Chemistry PYQ › CSIR-NET › December 2019

1. Q1 — Choose the equilibria from the following that are NOT favoured to go to right (A) As₂S₅ + 5HgO gives As₂O₅ + · Acids and Bases
2. 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
3. Q3 — In spectrofluorimetric determination in solution A. absorbance of analyte solution is kept near to 0.05 B · Analytical Chemistry
4. Q4 — The ion having the highest bond order is · Chemical Bonding
5. Q5 — The magnitude of bond angles in gaseous NF₃, SbF₃ and SbCl₃ follow the order · Chemical Bonding
6. Q6 — Consider the following statements for Allred-Rochow electronegativity (χAR): (i) χAR is directly proportional · Chemical Bonding
7. Q7 — For an a an octahedral Cu²⁺ complex depicting axial EPR spectrum (g), the geometry of Cu and the orbital · Inorganic Spectroscopy
8. Q8 — For the complex shown below in non-fluxional state, the expected ³¹P{¹H} NMR resonance(s) is/are [³¹P=I=1/2] · Inorganic Spectroscopy
9. Q9 — The correct order for the rate of thermal decarboxylation of the following compounds is A B C · General Organic Chemistry
10. Q10 — The correct order of basicity of the following compounds is A B C D · General Organic Chemistry
11. Q11 — The correct IUPAC name for the following molecule is · General Organic Chemistry
12. Q12 — The stereochemical relationship of Ha and Hb in the following is · General Organic Chemistry
13. Q13 — The correct order of stability of the carbocations A-C is A B C · General Organic Chemistry
14. Q14 — The correct statement about for the orientation of the bromine atoms in the most stable conformations of and · General Organic Chemistry
15. Q15 — The synthetic equivalent of given synthon is C=O · General Organic Chemistry
16. Q16 — The number of geometrical isomers of the complex [RhH(C ≡ CR)₂ (PMe₃)₃] · General Organic Chemistry
17. Q17 — The correct order of pKa of the following compounds is A B C · General Organic Chemistry
18. Q18 — Muscone is a Muscone · Natural Products
19. Q19 — The natural product that gives signal at δ 218 ppm in its ¹³ C NMR spectrum · Natural Products
20. 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
21. Q21 — The compound that shows peaks in the EI mass spectrum at m/z 121, 105, 77, 44 is · Organic Spectroscopy
22. Q22 — The HOMO of π-molecular orbitals of methylazide is · Pericyclic Reactions
23. Q23 — E1cb mechanism is followed in the reaction of: · Reagents, Reaction Mechanisms & Named Reactions
24. Q24 — Products A and B formed in the following transformation of alkylidenecarbenes are · Reagents, Reaction Mechanisms & Named Reactions
25. Q25 — The correct order of the reactions involved in the following transformation is: · Reagents, Reaction Mechanisms & Named Reactions
26. Q26 — The major product A and the byproducts B formed in the following reaction are · Reagents, Reaction Mechanisms & Named Reactions
27. Q27 — The reaction that gives E-2-methylhex-3-ene as the major product is · Reagents, Reaction Mechanisms & Named Reactions
28. Q28 — In the following transformation, the enantiomerically pure lactone A is · Reagents, Reaction Mechanisms & Named Reactions
29. Q29 — The major product in the following transformation is · Reagents, Reaction Mechanisms & Named Reactions
30. Q30 — In the given transformation, the intermediate [mathrmA] and the major product B are · Reagents, Reaction Mechanisms & Named Reactions
31. Q31 — The major products A and B in the following transformation are: · Reagents, Reaction Mechanisms & Named Reactions
32. Q32 — The major product in the following reaction sequence is · Reagents, Reaction Mechanisms & Named Reactions
33. Q33 — The structure of A in the following reaction is 1. i) hv · Reagents, Reaction Mechanisms & Named Reactions
34. Q34 — The correct sequence of reactions involved in the following transformation is: · Reagents, Reaction Mechanisms & Named Reactions
35. Q35 — The equilibrium constants for the reactions CH₄(g)+2H₂O(g) ⇌ CO₂(g)+4H₂(g) and CO(g)+H₂O(g) ⇌ CO₂(g)+H₂(g) · Chemical Kinetics
36. Q36 — The oxidation of NO to NO₂ occurs via the mechanism given below. 2 NO k₋₁k₁⇌ N₂O₂ N₂O₂+O₂ k₂ 2 NO₂ · Chemical Kinetics
37. Q37 — Substance 'A' is exposed to 600 nm, 100 W light source for 6626 s, with 50% of the incident light being · Chemical Kinetics
38. Q38 — For the electrochemical cell Ag|AgCl| MCl(0.01 M)|MCl(0.02 M)| AgCl Ag, the junction potential is the highest · Electrochemistry
39. Q39 — The electrolyte solution that has the smallest Debye-length at 298 K is · Electrochemistry
40. Q40 — A cube does not have the symmetry element · Group Theory
41. Q41 — The reducible representation Γ, in the table is equal to the following superposition of the irreducible · Group Theory
42. Q42 — The observed IR spectrum of BCl₃ exhibits three bands at 995, 480 and 244 cm⁻¹, while the Raman bands are · Group Theory
43. 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
44. Q44 — The molar residual entropy (in J / K) for solid OCS is close to · Gaseous State
45. Q45 — A monoatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Gaseous State
46. Q46 — The atomic masses of fluorine and hydrogen are 19.0 and 1.0 amu, respectively (1 amu=1.67×10⁻²⁷ kg). The bond · Molecular Spectroscopy
47. Q47 — The C=O bond length is 120 pm in CO₂. The moment of inertia of CO₂ would be close to (masses of C and O are · Molecular Spectroscopy
48. Q48 — Using standard equation for intrinsic viscosity [η]=KMva for a solution of polymer and any information from · Polymer Chemistry
49. Q49 — The molar residual entropy (in J K⁻¹) of solid OCS would be closest to · Statistical Thermodynamics
50. 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
51. Q51 — The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant · Surface Chemistry
52. Q52 — Consider the entropy changes in a system undergoing transformation, as depicted in the diagram, below 25°C Δ · Thermodynamics
53. Q53 — Molar composition of a mixture of P and Q at equilibrium is 3:1 (P:Q). A small disturbance in composition · Thermodynamics
54. Q54 — (CP - CV) for a non-ideal gas differs from (CP - CV) for a perfect gas by the expression · Thermodynamics
55. Q55 — A monatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Thermodynamics
56. Q56 — The excess molar entropy of mixing of liquid A with liquid B is -Rln 2. The experimentally observed change in · Thermodynamics
57. Q57 — Choose the equilibria from the following that are NOT favoured to go to right (A) As₂S₅+5HgO gives As₂O₅+5HgS · Acids and Bases
58. Q58 — Among SO₂(OH) F, CH₃ CO₂ H, LiF and H₂ O, the compound(s) which behave(s) as a base in liquid HF is/are · Acids and Bases
59. Q59 — The pair of light source and atomizer resulting highest sensitivity to atomic absorption spectrometric · Analytical Chemistry
60. Q60 — Inspectrofluorimetric determination in solution A. absorbance of analyte solution is kept near to 0.05 B · Analytical Chemistry
61. Q61 — Match the items in column I with those of column II Correct match is · Analytical Chemistry
62. Q62 — Choose the correct statements for oxymyoglobin and cytochrome P₄₅₀ (resting state) from the following: A · Bioinorganic Chemistry
63. Q63 — The correct match for the drug molecules in the Column A with their medicinal use in Column B is P (i) · Bioinorganic Chemistry
64. Q64 — Complex(es) which has/have unpaired electron(s) that is equal to that of iron center in oxymyoglobin is/are · Bioinorganic Chemistry
65. Q65 — Match Column I, II and III The correct match is · Bioinorganic Chemistry
66. Q66 — In the catalytic cycle of Cytochrome P₄₅₀, the generation of [(porphyrin)+FeIV(O)] from · Bioinorganic Chemistry
67. Q67 — The ion having the highest bond order is · Chemical Bonding
68. Q68 — The magnitude of bond angles in gaseous NF₃, SbF₃ and SbCl₃ follow the order · Chemical Bonding
69. Q69 — The species for which the shapes (geometry) can be predicted by VSEPR theory is/are (A) [PtCl₄]²⁻ (B) · Chemical Bonding
70. Q70 — Choose the correct order of energy of 2 σg and 1 π₀ molecular orbitals for B₂, C₂ and O₂ : · Chemical Bonding
71. Q71 — As per the VSEPR theory, shapes of and are, respectively · Chemical Bonding
72. Q72 — The total bond order between adjacent carbon atoms of benzene is · Chemical Bonding
73. Q73 — For an a an octahedral Cu²⁺ complex depicting axial EPR spectrum (g), the geometry of Cu and the orbital · Inorganic Spectroscopy
74. Q74 — For the complex shown below in non-fluxional state, the expected ³¹ P { ¹ H} NMR resonance(s) is/are [ ³¹ · Inorganic Spectroscopy
75. Q75 — In Mossbauer spectrum of a sample containing iron recorded in the presence of a static magnetic field, the · Inorganic Spectroscopy
76. Q76 — Pair of lanthanide ions which show significant deviation between the experimental and calculated magnetic · Lanthanides and Actinides
77. Q77 — The pair in which both actinides show +3 oxidation state only is · Lanthanides and Actinides
78. Q78 — The correct match for column A with column B is : · Lanthanides and Actinides
79. Q79 — The common heptacity observed for coordination of C₆₀ to a metal center is · Main Group Elements
80. Q80 — Match the items in Column I with those of Column II The correct match is. · Main Group Elements
81. Q81 — Consider the following statements: (A) The highest oxidation state of Group 3 elements is more readily shown · Main Group Elements
82. Q82 — The correct statements for dithionite and dithionate anions from the following are (A) both have S-S bond (B) · Main Group Elements
83. Q83 — Correct statement/s among the following with respect to ionization energy (IE) is/are (i) (IE₁+IE₂+IE₃) for · Main Group Elements
84. Q84 — The reason for significantly high solubility of AgClO₄ in benzene than in alkane solvents is · Main Group Elements
85. Q85 — Choose the correct statements for the Group 15 halides: (i) AsCl₃ can form complexes of type [AsCl₄]⁻in the · Main Group Elements
86. Q86 — The reaction of XeF₆ with a limited amount of quartz gives compound A. Then on reaction with an equivalent · Main Group Elements
87. Q87 — Identify from following the products of K-electron capture by the nucleus: (A) neutron (B) neutrino (C) · Nuclear Chemistry
88. 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
89. Q89 — The most stable vanadium species in aqueous medium is · Organometallic Compounds
90. Q90 — The correct order of metal-carbon distance is · Organometallic Compounds
91. Q91 — The rate-determining step in the catalytic synthesis of acetic acid by Monsanto process is · Organometallic Compounds
92. Q92 — The cluster types of [Fe₅(CO)₁₄ N]⁻and [Co₆(CO)₁₃ N]⁻are, respectively, · Organometallic Compounds
93. Q93 — The main product of nucleoplallic attack of H⁻ on the complex ion given below is · Organometallic Compounds
94. Q94 — The order of rate of substitution of chloride by pyridine (in ethanol) in the following complexes is · Organometallic Compounds
95. Q95 — Among the following complexes, the one showing the highest rate of substitution of a CO ligand on heating · Organometallic Compounds
96. Q96 — The product A of the following reaction is · Organometallic Compounds
97. Q97 — In IR spectrum, recorded neat, a compound shows a strong and broad band at 3300 cm⁻¹. The band becomes sharp · Organic Spectroscopy
98. Q98 — The correct match of ¹³C NMR chemical shift values (δ ppm) for pyridine is · Organic Spectroscopy
99. 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
100. Q100 — The structure of the compound which displays the following spectral data is IR = 1690, 1100 cm⁻¹ ¹H NMR: δ · Organic Spectroscopy
101. Q101 — The natural product that gives a signal at 218 ppm in its ¹³ C NMR spectrum is · Organic Spectroscopy
102. Q102 — The correct order of carbonyl stretching frequency of the given compounds is A B C · Organic Spectroscopy
103. Q103 — The structure that exhibits the following spectral data is IR (νmax): 1740 cm⁻¹ ¹H NMR: δ=0.9(t,3H) · Organic Spectroscopy
104. Q104 — The intermediate A and the major product B, formed in the following reaction are [A] Δ [B] · Pericyclic Reactions
105. Q105 — The major product formed in the following reaction is: + · Pericyclic Reactions
106. Q106 — The following transformation involves a series of + + · Pericyclic Reactions
107. Q107 — The major product formed in the following reaction is · Photochemical Reactions
108. Q108 — The major products A and B formed in the following reactions are A · Photochemical Reactions
109. Q109 — A monoatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Atomic and Molecular Term Symbol
110. Q110 — Which of the following will result in deviation from Beer's law ? 1. Change in refractive index or medium. 2 · Chemical Kinetics
111. Q111 — Debey-Hückel screening length (κ⁻¹) is a measure of size of diffuse ion cloud around an ion, provided (2 e² · Electrochemistry
112. Q112 — The cell potential (in V) of a Ag / AgCl / KCl electrode connected to the standard hydrogen electrodeat 298 K · Electrochemistry
113. Q113 — In common glass electrode, alkaline error caused at pH>10 is least for · Electrochemistry
114. Q114 — For the electrochemical cell Ag|AgCl| MCl(0.01 M)|MCl(0.02 M)| AgCl Ag, the junction potential is the highest · Electrochemistry
115. 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 · Electrochemistry
116. Q116 — An aqueous solution contains 0.02 mol kg⁻¹ NaCl and 0.03 mol kg⁻¹ Ca (NO₃)₂. The logarithm of mean ionic · Electrochemistry
117. Q117 — If the rate constant for a base catalyzed ester hydrolysis reaction is 0.20 L mol⁻¹ s⁻¹, half-life (in s) of · Chemical Kinetics
118. Q118 — The rate constant of a second order reaction 2 A → Z is k₂. If the initial concentration of the reactant is · Chemical Kinetics
119. Q119 — The oxidation of NO to NO₂ occurs via the mechanism given below 2NO k₋₁k₁⇌ N₂O₂ N₂O₂ + O₂ k₂ 2NO₂ (d · Chemical Kinetics
120. Q120 — Substance 'A' is exposed to 600 nm, 100 W light source for 6626 s, with 50% of the incident light being · Photochemistry
121. Q121 — The concentration (C) of a compound undergoing decomposition as a function of time (t) is given below: The · Chemical Kinetics
122. Q122 — For a reaction, raising the temperature from 200 K to 300 K results in the increase of rate constant by a · Chemical Kinetics
123. Q123 — A cube does not have the symmetry element · Group Theory
124. Q124 — The reducible representation Γ, in the table is equal to the following superposition of the irreducible · Group Theory
125. Q125 — The following is the character table for the C2 v point group There are two functions f₁ and f₂ belonging to · Group Theory
126. Q126 — The observed IR spectrum of BCl₃ exhibits three bands at 995, 480 and 244 cm⁻¹, while the Raman bands are · Group Theory
127. 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
128. Q128 — For every atom that is NOT shifted under C₄ and σ symmetry operations, the characters are respectively. · Group Theory
129. Q129 — The equivalent symmetry operations for S₆³ and S₃⁶ are, respectively · Group Theory
130. 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
131. Q131 — The molecule with the smallest rotation partition function at any temperature among the following is: · Molecular Spectroscopy
132. Q132 — The frequency of O-H stretch occurs at ~ 3600 cm⁻¹. The O-D stretch frequency (in cm⁻¹) would be closest to · Molecular Spectroscopy
133. Q133 — In the pure rotational microwave spectrum of a XY molecule, the adjacent lines are separated by 4 cm⁻¹. If · Molecular Spectroscopy
134. Q134 — The equilibrium dissociation energy of a diatomic molecule is 4.75 eV and its stretching frequency · Molecular Spectroscopy
135. Q135 — The vibrational transition energies of a diatomic molecule corresponding to v=1 ← v=0 and v=2 ← v=1 are · Molecular Spectroscopy
136. Q136 — The energy separation of ¹² C ¹⁶ O rotational energy levels between J′ ′=3 and J′ ′=9 is 24 cm⁻¹. The · Molecular Spectroscopy
137. Q137 — In a polymer of N monomer units, the root mean square separation between the two ends is proportional to · Polymer Chemistry
138. Q138 — The degree of polymerization at t=10 h of a polymer formed by a stepwise process with polymerization rate · Polymer Chemistry
139. Q139 — Using standard equation for intrinsic viscosity [η]=K Mva for a solution of polymer and any information from · Polymer Chemistry
140. Q140 — A sample of polysterene is composed of three weight fractions: 0.20,0.50 and 0.30. The molecular weight of · Polymer Chemistry
141. Q141 — The Miller index for the plane as shown in the figure and parallel to the c-axis, is · Solid State Chemistry
142. Q142 — X-rays of 173 pm wavelength are reflected by the (111) plane of a cubic primitive crystal at θ=30°. The unit · Solid State Chemistry
143. Q143 — Iron belongs to the BCC lattice. The Miller indices of the second allowed reflection in the powder · Solid State Chemistry
144. Q144 — In the ccp packing, the number of lattice points per unit area in the planes is in the order · Solid State Chemistry
145. Q145 — Consider a two-level system in which the excited state, separated from the ground state by energy ∈, is · Statistical Thermodynamics
146. Q146 — The molar residual entropy (in JK⁻¹) of solid OCS would be closest to · Statistical Thermodynamics
147. Q147 — The entropy in terms of internal energy {U-U(0)}, and canonical partition function (Q) is given by · Statistical Thermodynamics
148. 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
149. Q149 — The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant · Surface Chemistry
150. Q150 — The correct statement about chemisorption is · Surface Chemistry
151. Q151 — A gas is known to satisfy Langmuir isotherm when adsorbed on a certain metal surface. If the fractional · Surface Chemistry
152. Q152 — The surface tension of dilute soap solution is lower than that of pure water because · Surface Chemistry
153. Q153 — Consider the entropy changes in a system undergoing transformation, as depicted in the diagram, below The · Thermodynamics
154. Q154 — Molar composition of a mixture of P and Q at equilibrium is 3: 1(P: Q). A small disturbance in composition · Thermodynamics
155. Q155 — 1.0 mol of a perfect monatomic gas is put through the cycle shown in the figure. The total work (in J) done · Thermodynamics
156. Q156 — (Cp-Cv) for a non-ideal gas differs from (Cp-Cv) for a perfect gas by the expression · Thermodynamics
157. Q157 — A monatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Thermodynamics
158. Q158 — For a van der Waals gas, the partial derivative is ((∂ U)/(∂ V))T · Thermodynamics
159. Q159 — The change in chemical potential (in J) of one mole of an ideal gas, when it is compressed isothermally at · Thermodynamics

← June 2019 · June 2021 → · All CSIR-NET papers