IIT JEE Chemistry 1985

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IIT JEE Chemistry 1985

  1. 1. IIT JEE - Past papers<br />CHEMISTRY- UNSOLVED PAPER – I985<br />
  2. 2. SECTION – I<br />Single Correct Answer Type<br />This section contains 20 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.<br />
  3. 3. 01<br />Problem<br />Bohr model can explain:<br />The spectrum of hydrogen atom only <br />Spectrum of an atom or ion containing one electron only <br />The spectrum of hydrogen molecule <br />The solar spectrum <br />
  4. 4. Problem <br />02<br />The molecule having one unpaired electron is:<br />NO<br />CO<br />CN-<br />d. <br />
  5. 5. Problem<br />03<br />An example of a reversible reaction is:<br />a.<br />b. <br />c.<br />d. <br />
  6. 6. Problem<br />04<br />Rate of diffusion of a gas is:<br />Directly proportional to its density <br />Directly proportional to its molecular weight<br />Directly proportional to the square root of its molecular weight <br />Inversely proportional to the square root of its molecular weight <br />
  7. 7. Problem<br />05<br />For a dilute solution, Raoult’s law states that:<br />The lowering of vapour pressure is equal to the mole fraction of solute <br />The relative lowering of vapour pressure is proportional to the amount of solute in solution<br />The relative lowering of vapour pressure is proportional to the amount of solute in solution<br />The vapour pressure of the solution is equal to the mole fraction of solvent<br />
  8. 8. Solution<br />06<br />The reaction occurs in the galvanic cell:<br />Ag|AgCl|(s) |KCl (soln) |AgNO3 (soln) |Ag<br />PtH2 (g) |HCl (soln) | (soln) |Ag<br />PtH2 (g) |HCl (soln) |AgCl(s) |Ag<br />PtH2 (g) |KCl (soln) |AgCl(s) |Ag<br />
  9. 9. Problem<br />07<br />The radius of an atomic nucleus is of the order of:<br /> cm<br />10-13cm<br />10-14cm<br />10-8cm<br />
  10. 10. Problem<br />08<br />The best indicator for detection of end point in titration of a weak acid and a strong base is:<br />Methyl orange (3 to 4)<br />Methyl red (5 to 6)<br />Bromothymol blue (6 to 7.5)<br />Phenolphthalein (8 to 9.6)<br />Note: Figures in the brackets show the pH range of the indicator<br />
  11. 11. Problem<br />09<br />Nitrogen dioxide cannot be obtained by heating:<br />a. <br />b.<br />c. <br />d.<br />
  12. 12. Problem<br />10<br />The oxide that gives hydrogen peroxide on treatment with a dilute acid is:<br />a.<br />b. <br />c.<br />d. <br />
  13. 13. Problem<br />11<br />The molecular formula of Gluer's salt is :<br />a.<br />b.<br />c.<br />d.<br />
  14. 14. Problem<br />12<br />A gas that cannot be collect over water is:<br />a.<br />b.<br />c.<br />d.<br />
  15. 15. Problem<br />13<br />The conjugate acid of NH is:<br />a.<br />b.<br />c. NH<br />d.<br />
  16. 16. Problem<br />14<br />Acidic hydrogen is present in:<br />Ethyne<br />Ethene<br />Benzene<br />Ethane<br />
  17. 17. Problem<br />15<br />The compound that will not give iodoform on treatment with alkali and iodine is:<br />Acetone<br />Ethanol<br />Diethyl ketone<br />Isopropyl alcohol<br />
  18. 18. Problem<br />16<br />Anti-Markownikoff addition of HBr is not observed in:<br />Propene<br />Butene<br />But –2-ene<br />Pent-2-ene<br />
  19. 19. Problem<br />17<br />The compound that is not a Lewis acid is:<br /> a. <br /> b. <br /> c. <br /> d. SnCl<br />
  20. 20. Problem<br />18<br />The compound that is most reactive towards electrophonic nitration is:<br />Toluene <br />Benzene <br />Benzoic acid <br />Nitrobenzene<br />
  21. 21. Problem<br />19<br />Hydrogen gas will not reduce:<br />Heated cupric oxide <br />Heated ferric oxide <br />Heated stannic oxide <br />Heated aluminum oxide<br />
  22. 22. Problem<br />20<br />Electromagnetic radiation with maximum wavelength is:<br />Ultraviolet <br />Radio wave <br />X-ray <br />Infrared <br />
  23. 23. SECTION – II<br /><ul><li>Give the reason in one or two sentences for each of the following.</li></li></ul><li>01<br />Problem<br />Anhydrous HCl is a bad conductor of electricity but aqueous HCl is a good conductor.<br />
  24. 24. Problem <br />02<br />.<br />O-Nitrogen is steam volatile whereas p- nitro phenol is not.<br />
  25. 25. Problem<br />03<br />Formic acid is stronger acid than acetic acid.<br />
  26. 26. Problem<br />04<br />Graphite is used as a solid lubricant.<br />
  27. 27. Problem<br />05<br />Fluorine cannot be prepared from fluorides by chemical oxidation.<br />
  28. 28. SECTION – III<br />Complete the following sentences<br />
  29. 29. 01<br />Problem<br />The rate of chemical change is directly proportional to _________.<br />
  30. 30. Problem <br />02<br />The terminal carbon atom in butane is ___________ hybridized.<br />.<br />
  31. 31. Problem<br />03<br />On Milliken scale, the average of ionization potential and electron affinity is known as _____________.<br />
  32. 32. Problem<br />04<br />The number of neutrons in the parent nucleus which gives 14N on beta emission is __________.<br />
  33. 33. Problem<br />05<br />Sodium dissolved in liquid ammonia conducts electricity because_________.<br />
  34. 34. SECTION – IV<br />True or false<br />This question contains five statements, each of which is either true of false. Indicate your choice of the answer in the answer-book by writing TRUE or FALSE for each statement.<br />
  35. 35. 01<br />Problem<br />Kinetic energy of molecule is zero at C<br />
  36. 36. Problem <br />02<br />Carbon tetrachloride is inflammable.<br />
  37. 37. Problem<br />03<br />All molecules with polar bonds have dipole moment.<br />
  38. 38. Problem<br />04<br />A gas in a closed container will exerts much higher pressure due to gravity at the bottom than at the top.<br />
  39. 39. Problem<br />05<br />M-Chlorobromobenzene is an isomer of m-bromochlorobenzene.<br />
  40. 40. Problem<br />06<br />Iodide is a better nucleophile than bromide.<br />
  41. 41. Problem<br />07<br /> ­ is nonlinear molecule.<br />
  42. 42. Problem<br />08<br />Heat capacity of a diatomic gas is higher than that of a monatomic gas.<br />
  43. 43. Problem<br />09<br />Addition of ammonium chloride to a solution containing ferric and magnesium ions is essential for selective precipitation of ferric hydroxide by aqueous ammonia<br />
  44. 44. Problem<br />10<br />Solubility of sodium hydroxide increases with increase in temperature.<br />
  45. 45. SECTION – V<br />Arrange the following in order of their sentences <br />
  46. 46. 01<br />Problem<br />Decreasing ionic size<br />
  47. 47. Problem <br />02<br />Increasing acidic property ZnO, MgO<br />
  48. 48. Problem<br />03<br />Increasing first ionization potential Mg, Al, Si, Na<br />
  49. 49. Problem<br />04<br />Increasing reactivity towards HCN , HCHO, C2H5COCH3<br />
  50. 50. Problem<br />05<br />Increasing bond length<br />
  51. 51. SECTION – IV<br />Match the following<br />
  52. 52. 01<br />Problem<br />Spinel<br />Felspar<br />Cerussite<br />Malachite <br />Kisserite<br />
  53. 53. Problem <br />02<br />Liquid air Deacon Process <br /> Parke process <br />Nitric oxide Claude process <br />Silver Ostwald process <br />Chlorine Solvay process <br />
  54. 54. Problem<br />03<br />Phenol colored glass <br />antichlor <br />Salicylic acid refractory material <br />Quick lime antiseptic<br />CuO analgesic<br />
  55. 55. Problem<br />04<br />Aston radium <br />Priestley radioactivity<br />Ramsay oxygen<br />Marie Curie inert gas <br />Becquerel mass spectrum<br />
  56. 56. FOR SOLUTION VISIT WWW.VASISTA.NET<br />

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