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 · Acid and Bases
2. Q3 — In spectrofluorimetric determination in solution A. absorbance of analyte solution is kept near to 0.05 B · Analytical Chemistry
3. Q4 — The ion having the highest bond order is · Chemical Bonding
4. Q6 — Consider the following statements for Allred-Rochow electronegativity (χAR): (i) χAR is directly proportional · Chemical Bonding
5. 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
6. 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
7. Q37 — Substance 'A' is exposed to 600 nm, 100 W light source for 6626 s, with 50% of the incident light being · Chemical Kinetics
8. Q38 — For the electrochemical cell Ag|AgCl| MCl(0.01 M)|MCl(0.02 M)| AgCl Ag, the junction potential is the highest · Electrochemistry
9. Q39 — The electrolyte solution that has the smallest Debye-length at 298 K is · Electrochemistry
10. Q40 — A cube does not have the symmetry element · Group Theory
11. Q42 — The observed IR spectrum of BCl₃ exhibits three bands at 995, 480 and 244 cm⁻¹, while the Raman bands are · Group Theory
12. Q44 — The molar residual entropy (in J / K) for solid OCS is close to · Gaseous State
13. Q45 — A monoatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Gaseous State
14. 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
15. Q51 — The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant · Surface Chemistry
16. Q53 — Molar composition of a mixture of P and Q at equilibrium is 3:1 (P:Q). A small disturbance in composition · Thermodynamics
17. Q54 — (Cp - Cv) for a non-ideal gas differs from (Cp - Cv) for a perfect gas by the expression · Thermodynamics
18. Q55 — A monatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Thermodynamics
19. Q56 — The excess molar entropy of mixing of liquid A with liquid B is -Rln 2. The experimentally observed change in · Thermodynamics
20. 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 · Acid and Bases
21. Q97 — In IR spectrum, recorded neat, a compound shows a strong and broad band at 3300 cm⁻¹. The band becomes sharp · Organic Spectroscopy
22. Q98 — The correct match of ¹³C NMR chemical shift values (δ ppm) for pyridine is · Organic Spectroscopy
23. 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
24. Q101 — The natural product that gives a signal at 218 ppm in its ¹³ C NMR spectrum is · Organic Spectroscopy
25. Q109 — A monoatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Atomic and Molecular Term Symbol
26. Q114 — For the electrochemical cell Ag|AgCl| MCl(0.01 M)|MCl(0.02 M)| AgCl Ag, the junction potential is the highest · Electrochemistry
27. 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
28. 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
29. Q122 — For a reaction, raising the temperature from 200 K to 300 K results in the increase of rate constant by a · Chemical Kinetics
30. Q128 — For every atom that is NOT shifted under C₄ and σ symmetry operations, the characters are respectively. · Group Theory
31. Q129 — The equivalent symmetry operations for S₆³ and S₃⁶ are, respectively · Group Theory
32. Q131 — The molecule with the smallest rotation partition function at any temperature among the following is: · Molecular Spectroscopy
33. 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
34. Q133 — In the pure rotational microwave spectrum of a XY molecule, the adjacent lines are separated by 4 cm⁻¹. If · Molecular Spectroscopy
35. Q134 — The equilibrium dissociation energy of a diatomic molecule is 4.75 eV and its stretching frequency · Molecular Spectroscopy
36. Q135 — The vibrational transition energies of a diatomic molecule corresponding to v=1 ← v=0 and v=2 ← v=1 are · Molecular Spectroscopy
37. Q137 — In a polymer of N monomer units, the root mean square separation between the two ends is proportional to · Polymer Chemistry
38. Q138 — The degree of polymerization at t=10 h of a polymer formed by a stepwise process with polymerization rate · Polymer Chemistry
39. 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
40. Q143 — Iron belongs to the BCC lattice. The Miller indices of the second allowed reflection in the powder · Solid State Chemistry
41. Q144 — In the ccp packing, the number of lattice points per unit area in the planes is in the order · Solid State Chemistry
42. Q145 — Consider a two-level system in which the excited state, separated from the ground state by energy ∈, is · Statistical Thermodynamics
43. Q146 — The molar residual entropy (in JK⁻¹) of solid OCS would be closest to · Statistical Thermodynamics
44. 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
45. Q149 — The order of a surface catalyzed unimolecular reaction, at very low and very high pressures of the reactant · Surface Chemistry
46. Q150 — The correct statement about chemisorption is · Surface Chemistry
47. Q152 — The surface tension of dilute soap solution is lower than that of pure water because · Surface Chemistry
48. Q153 — Consider the entropy changes in a system undergoing transformation, as depicted in the diagram, below 25°C Δ · Thermodynamics
49. Q154 — Molar composition of a mixture of P and Q at equilibrium is 3: 1(P: Q). A small disturbance in composition · Thermodynamics
50. Q156 — (Cp-Cv) for a non-ideal gas differs from (Cp-Cv) for a perfect gas by the expression · Thermodynamics
51. Q157 — A monatomic perfect gas undergoes expansion from (p₁, V₁) to (p₂, V₂) under isothermal or adiabatic · Thermodynamics
52. Q158 — For a van der Waals gas, the partial derivative is ((∂ U)/(∂ V))T · Thermodynamics
53. 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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