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Chemistry PYQ

CSIR-NET Chemistry June 2021 — 58 questions

Chemical Sciences, June 2021: every question we hold for this paper, with options, the answer where the source gives one, and an explanation where available.

  1. Q1 — Identify the correct statement for the two reactions given below Xe+PtF₆ SF₆ [Xe]⁺[PtF₆]⁻ XeF₄+Me₄NF → · Acids and Bases
  2. Q2 — Match the items of column I with the applications given in column II · Bioinorganic Chemistry
  3. Q3 — Match the iron and copper proteins with biological function in the table below: The correct matches are · Bioinorganic Chemistry
  4. Q4 — In 3-iron ferredoxins, the number of sulfide bridges and cysteinyl ligands, respectively, are: · Bioinorganic Chemistry
  5. Q5 — Which of the following statements for rubredoxin, A. F₂⁺ center has a tetrahedral geometry. B. Reduced form · Bioinorganic Chemistry
  6. Q6 — Among the following which set of molecular/ionic species all have a planar structure? · Chemical Bonding
  7. Q7 — The total number of lone pairs of electrons on all the atoms in cyanogen azide and thiocyanogen respectively · Chemical Bonding
  8. Q8 — Which of the following statements regarding dissociative substitution in an octahedral transition metal · Coordination Chemistry
  9. Q9 — Consider an octahedral complex Ma₂b₂cd, where a, b, c, and d are monodentate ligands. The number of · Coordination Chemistry
  10. Q10 — For the ligand-to-metal charge-transfer (LMCT) transitions in the oxo-anions given below, the wavelength of · Coordination Chemistry
  11. Q11 — Consider the following statements for the self-exchange electron transfer reaction in [Cr (H₂ O)₆]2+/3+ A. σ* · Coordination Chemistry
  12. Q12 — The number of CO bands for isomers from sets (i) and (ii) in their IR spectra Set (i): Trigonal bipyramidal · Coordination Chemistry
  13. Q13 — The absorption spectrum of [Cr (NH₃)₆]³⁺ in water shows two bands around 475 and 365 nm. The ground term and · Coordination Chemistry
  14. Q14 — For trigonal bipyramidal coordination complex (ML5) the correct point group symmetry and the relative order · Coordination Chemistry
  15. Q15 — The effective magnetic moment (in BM) for a lanthanide f¹⁰ ion is approximately · Lanthanides and Actinides
  16. Q16 — The correct order of the electron affinity for one-electron gain of the elements is · Main Group Elements
  17. Q17 — Which of the statements (A-D) given below are correct for B₂H₆ molecule: A. Addition of Et₂O.BF₃ to NaBH₄ in · Main Group Elements
  18. Q18 — Which of the following reaction(s) do(es) NOT occur (i) [NPCl₂]₃ + 6 NaF [Reflux]MeCN [NPF₂]₃ + 6 NaCl (ii) n · Main Group Elements
  19. Q19 — Consider following statement(s) in the context of NO and CO ligands A. In the bent mode, NO donates three · Organometallic Compounds
  20. Q20 — Consider the following statement (s) in the context of organometallic complex (x) X A. The carbene ligand · Organometallic Compounds
  21. Q21 — The correct geometries for the metal carbonyl clusters, A-C A. [Ru₆(CO)₁₇B]⁻ B. [Os₆(CO)₁₈P]⁻ C. [Os₄(CO)₁₆] · Organometallic Compounds
  22. Q22 — Identify the thermodynamically stable structure of [(η⁵-C₅H₅)Fe(μ-CO)(NO)]₂ · Organometallic Compounds
  23. Q23 — The major product formed in the following reaction + PhMgBr [Pd(PPh₃)₄] · Organometallic Compounds
  24. Q24 — The structure of the reactive intermediate generated by the reaction of CHCl₃ and KOH is · Organometallic Compounds
  25. Q25 — The correct order of C=O stretching frequency in IR spectrum for the following compound is A B C · Organic Spectroscopy
  26. Q26 — Which of the following molecule has the ¹H NMR spectrum: δ 2.3 (s, 3H), 3.9 (s, 3H), 7.25 (d, J=7Hz, 2H) · Organic Spectroscopy
  27. Q27 — A compound shows [M]⁺ at m/z 84 and has base peak at 56. It exhibits only one peak in ¹H NMR at δ 1.4 ppm and · Organic Spectroscopy
  28. Q28 — Which of the patterns (A,B,C or D) fits best with the ¹³ C ~ N M R spectrum of TiCl₃ (CDH₂), [Given: J(C-H)¹ · Organic Spectroscopy
  29. Q29 — The following transformation Is an example of · Pericyclic Reactions
  30. Q30 — The major product formed in the following reaction is · Pericyclic Reactions
  31. Q31 — For the cell Cd |CdCl₂ | AgCl | Ag; Ecell o=0.675 V and dEcell o / dT=-6.5 × 10⁻⁴ VK⁻¹ at 27° C. The Δ H (kJ · Electrochemistry
  32. Q32 — For weak electrolyte like acetic acid, the relation among conductance (λ), equilibrium constant (K) and · Electrochemistry
  33. Q33 — The amount of Ba (NO₃)₂ (molecular weight 261.32 amu) required to be added to 500 g of a 0.11 mol kg⁻¹ · Electrochemistry
  34. Q34 — Consider following terms. Identify those which are relevant to d.c. polarography A. Thermal current B · Electrochemistry
  35. Q35 — The rate constant for the reaction A₂ B₄ O → AB₄+AO, is described as, log k=14.1-10000 K/T the activation · Chemical Kinetics
  36. Q36 — The rate of decomposition of a gas is 10 mM s⁻¹ when 10% is reacted and it is 5 mM s⁻¹ when 40% is reacted · Chemical Kinetics
  37. Q37 — For a person weighing 70 kg the minimal volume (in mL) of a fatal dose of a compound with LD₅₀=80 mg. kg⁻¹ · Chemical Kinetics
  38. Q38 — For the reaction, [cis-M(en)₂(OH)₂]⁺ k₂k₁⇌ [trans-M(en)₂(OH)₂]⁺ the equilibrium constant is 0.16 and k₁ is · Chemical Kinetics
  39. Q39 — The correct statement from the following set (i) to (iv) is (i) if q is the displacement from equilibrium for · Molecular Spectroscopy
  40. Q40 — Match the following Energy-dispersive X-ray spectroscopy (EDS) 9 · Molecular Spectroscopy
  41. Q41 — The molecule that will not absorb in the microwave region, but will absorb in the infra-red region · Molecular Spectroscopy
  42. Q42 — The following data is obtained for a light diatomic (AB) molecule from its rotational Raman spectrum. (B=2 · Molecular Spectroscopy
  43. Q43 — Plutonium (atomic mass =244 g mol⁻¹) crystallizes in monoclinic lattice (a=620 pm, b=480 pm, c=1100 pm · Solid State Chemistry
  44. Q44 — The miller indices of the planes parallel to the b axis and intersecting the a and c axis, as shown in the · Solid State Chemistry
  45. Q45 — The Number of microstates corresponding to ⁴F atomic term? · Statistical Thermodynamics
  46. Q46 — For a micro-canonical system, the correct probability distribution function for energy is given by · Statistical Thermodynamics
  47. Q47 — The volume of nitrogen gas adsorbed at STP to form a monolayer on a porous solid surface is · Surface Chemistry
  48. Q48 — In a Langmuir-type adsorption, a solid adsorbs 0.25 mg of a gas when the pressure of the gas is 50 bar and · Surface Chemistry
  49. Q49 — Liquid A has half the surface tension and twice the density of liquid B at 30° C. The contact angles of A and · Surface Chemistry
  50. Q50 — The maximum number of phases that can be simultaneously in equilibrium for a one component system is · Thermodynamics
  51. Q51 — When yellow phosphorous is converted to red phosphorous, the entropy and volume of the system do not change · Thermodynamics
  52. Q52 — The molecular orbital involved in the interaction of the oxime shown below, with a base is · General Organic Chemistry
  53. Q53 — The pKa values for the following compounds A B C Are in the order · General Organic Chemistry
  54. Q54 — The correct relationship between the following structures is that they are · Stereochemistry
  55. Q55 — The correct match for the Bond Dissociation Energy (BDE) of the C-H bonds of the compounds in column I, with · General Organic Chemistry
  56. Q56 — The structure that corresponds to the most stable conformation of the following compound is · Stereochemistry
  57. Q57 — The correct relationship between the two faces of the C=O group in compound A and B is · Stereochemistry
  58. Q58 — The Newman projection given below corresponds to the compound · Stereochemistry

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