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Chemistry PYQ

CSIR NET Chemistry June 2017 — 68 questions

Chemical Sciences, June 2017: every question we hold for this paper, with options, the answer where the source gives one, and an explanation where available.

  1. Q1 — The compound that gives a basic solution in HF is : · Acid and Bases
  2. Q2 — The IUPAC name of the following compound is · General Organic Chemistry
  3. Q3 — The correct match of natural products in Column-I with their biosynthetic precursors in Column-II is Column-I · Natural Products
  4. Q4 — Among the following, the natural product that is a steroid and contains an α,β-unsaturated ketone is · Natural Products
  5. Q5 — The major product formed in the reaction of D-glucose with 2 ZnCl in MeOH is a methyl glucopyranoside (A or · Natural Products
  6. Q6 — ¹³C NMR spectrum of DMSO-d₆ gives a signal at δ 39.7 ppm as a · Organic Spectroscopy
  7. Q7 — The correct structure of the compound based on the following characteristic spectral data is IR: 1736 cm⁻¹ ¹H · Organic Spectroscopy
  8. Q8 — The major product formed in the sodium ethoxide mediated reaction between benzophenone and chloroacetate is · Reagents, Reaction Mechanisms & Named Reactions
  9. Q10 — The correct combination of reagents to effect the following reaction is: → · Reagents, Reaction Mechanisms & Named Reactions
  10. Q11 — The correct combination of reagents A and B to effect the following transformations are B A · Reagents, Reaction Mechanisms & Named Reactions
  11. Q14 — A solution of Fe³⁺ is titrated potentiometrically using Ce³⁺ solution at 25 °C. The emf (in V) of the redox · Electrochemistry
  12. Q15 — The standard cell potential of cell, Pt | H₂(g) | HBr(aq) | AgBr(s) | Ag(s), was measured over a range of · Electrochemistry
  13. Q17 — For a certain magnetic field strength, a free proton spin transition occurs at 700 MHz. Keeping the magnetic · Molecular Spectroscopy
  14. Q18 — The correct statement for any cyclic thermodynamic process is · Thermodynamics
  15. Q19 — Match items in column A with items in column B: · Acids and Bases
  16. Q20 — Identify the correct statement(s) for phosphorimetric measurement from the following: A. It is done after a · Analytical Chemistry
  17. Q21 — Identify correct statements from the following: A. Area of differential thermal analysis peak is proportional · Analytical Chemistry
  18. Q22 — The resonance Raman stretching frequencies (in cm⁻¹) of the bound O₂ species in oxyhemerthyrin and · Bioinorganic Chemistry
  19. Q23 — In vitro reaction of an excess of O₂ with free heme B in aqueous medium the end product is · Bioinorganic Chemistry
  20. Q24 — Consider the following statements for metallothioneins: A. the contain about 30% cysteine residues B. they · Bioinorganic Chemistry
  21. Q25 — Consider the following statements for deoxy-hemerythrin and deoxy-hemocyanin: A. they are involved in O₂ · Bioinorganic Chemistry
  22. Q26 — Based on VSEPR theory, the predicted shapes of [XeF₅]⁻and BrF₅ respectively, are · Chemical Bonding
  23. Q27 — The relative rates of water exchange for the hydrated complexes of (1) Ni²⁺ (2) V²⁺ and (3) Cr³⁺ ions follows · Coordination Chemistry
  24. Q28 — Consider the following statements for octahedral complexes. (a) [CrF₆]³⁻ (b) [Cr(ox)₃]³⁻ and (c) [Cr(en)₃]³⁺ · Coordination Chemistry
  25. Q29 — Match the items in the three columns. The correct answer is · Coordination Chemistry
  26. Q30 — Mössbauer spectrum of complex [Fe(1,10-phenanthroline)₂(NCS)₂] shows two lines at 300 K, four lines at 186 K · Inorganic Spectroscopy
  27. Q31 — (R₃Ge)₂ on photolysis gives a radical which shows ESR spectrum. The ESR signals carrying the signature of · Inorganic Spectroscopy
  28. Q32 — The ³¹P(¹H) NMR spectrum of 2,2,6,6-N₄P₄Cl₄(NMe₂)₄ is expected to show · Inorganic Spectroscopy
  29. Q33 — Which one of the following pairs has two magic numbers for closed nuclear shells? · Lanthanides and Actinides
  30. Q34 — The calculated and observed magnetic moments (in B.M.) of aqua complex of a lanthanide ion are 0 and ~3.5 · Lanthanides and Actinides
  31. Q35 — Both potassium and sulfuric acid form intercalation compounds with graphite. The graphite layers are · Main Group Elements
  32. Q36 — Addition of two electrons to the bismuth cluster Bi₅³⁺ results in a change of structure type from · Main Group Elements
  33. Q37 — The compound N₂ F₂ has two isomers. Choose the correct option from the following: · Main Group Elements
  34. Q38 — Choose the correct statement for magnitude of threshold energy of an endoergic nuclear reaction between · Nuclear Chemistry
  35. Q39 — Consider following statements for fission of U²³⁵ with thermal neutrons. A. The% of nuclei undergoing · Nuclear Chemistry
  36. Q40 — Choose the isoelectronic pair among the following: A. [V(CO)₆] B. [Cu(η⁵-C₅H₅)(CO)] C. [Co(CO)₄]⁻ D · Organometallic Compounds
  37. Q41 — An organometallic fragment that is isolobal to CH₃ ⁺is · Organometallic Compounds
  38. Q43 — The number of bonding molecular orbitals and the number of available skeletal electrons in [B₆ H₆]²⁻ · Organometallic Compounds
  39. Q44 — Addition of NaBH₄ to [ (η⁵-Cp) Fe (η⁶-C₆ H₆)]⁺will give · Organometallic Compounds
  40. Q45 — The μeff [Fe(S₂CNEt₂)₃] changes with temperature with the involvement of two electronic states. The states are · Organometallic Compounds
  41. Q47 — The correct structure of the compound based on the following characteristic spectral data is IR: 1736 ~ c m⁻¹ · Organic Spectroscopy
  42. Q48 — Following reaction is an example of 2. t-BuOK · Pericyclic Reactions
  43. Q49 — Following reaction is an example of + · Pericyclic Reactions
  44. Q50 — Following reaction involves · Pericyclic Reactions
  45. Q52 — If the pre-exponential factor in Arrhenius equation is 1.6 × 10¹² s⁻¹, the value of the rate constant at · Chemical Kinetics
  46. Q53 — In kinetic study of a chemical reaction, slopes are drawn at different times in the plot of concentration of · Chemical Kinetics
  47. Q54 — Photochemical decomposition of HI takes place with the following mechanism HI + hν (Ia) → H + I; H + HI k₁ H₂ · Chemical Kinetics
  48. Q56 — Arrhenius equations for two chemical reactions are: k₁ = A₁e-E₁/RT, k₂ = A₂e-E₂/RT. If E₁ > E₂ then at a · Chemical Kinetics
  49. Q57 — The electrochemical cell potential (E), after the reactants and products reach equilibrium, is (E⁰ is the · Electrochemistry
  50. Q58 — The specific conductance of a solution is 0.176 Ω⁻¹ cm⁻¹. If the cell constant is 0.255 cm⁻¹, the conductance · Electrochemistry
  51. Q59 — The standard cell potential for the reaction Zn(s) + Cu²⁺(aq) ⇔ Zn²⁺(aq) + Cu(s) is +1.10 V. The Gibbs free · Electrochemistry
  52. Q60 — A solution of Fe3+ is titrated potentiometrically using Ce³⁺ solution at 25°C. The emf (in V) of the redox · Electrochemistry
  53. Q61 — The standard cell potential of cell, Pt | H₂(g) | HBr(aq) | AgBr(s) | Ag(s), was measured over a range of · Electrochemistry
  54. Q62 — The correct relation involving symmetry operations · Group Theory
  55. Q63 — For a point group, an incomplete character table is given below with one irreducible representation missing · Group Theory
  56. Q65 — For a certain magnetic field strength, a free proton spin transition occurs at 700 MHz. Keeping the magnetic · Molecular Spectroscopy
  57. Q66 — The first electronic absorption band maximum of a polar and relatively rigid aromatic molecule appears at 310 · Molecular Spectroscopy
  58. Q67 — For a monodisperse polymer, the number-average molar mass (MN) and weight-average molar mass (Mw) are related · Polymer Chemistry
  59. Q68 — A polydisperse polymer sample has ten molecules of molar mass 20,000 g mol⁻¹ and fifteen molecules of molar · Polymer Chemistry
  60. Q69 — Metallic silver crystallizes in face-centred-cubic lattice structure with a unit cell of length 40 nm. The · Solid State Chemistry
  61. Q70 — Polonium is the only metal known to exist in a simple cubic lattice form. The density of polonium at 0°C is · Solid State Chemistry
  62. Q72 — The first excited state (²P1/2) of fluorine lies at an energy of 400 cm⁻¹ above the ground state (²P3/2). The · Statistical Thermodynamics
  63. Q73 — An intense purple colour (Plasmon band) is exhibited by a colloid consisting of spherical · Surface Chemistry
  64. Q75 — A one-component system with the associated phase diagram (see the figure) is not possible because · Thermodynamics
  65. Q76 — A phase transition process is always · Thermodynamics
  66. Q77 — The correct statement for any cyclic thermodynamic process is · Thermodynamics
  67. Q78 — The fugacity of a real gas is less than the pressure (P) of an ideal gas at the same temperature (T) only · Thermodynamics
  68. Q79 — The minimum work required by an engine to transfer 5 J of heat from a reservoir at 100 K to one at 300 K is · Thermodynamics

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