This document contains an unsolved chemistry practice paper from 1985 for the IIT JEE entrance exam. It has 5 sections with multiple choice, fill in the blank, true/false, and matching questions covering various chemistry concepts. The topics include the Bohr model, reaction types, gas laws, acid-base chemistry, organic chemistry reactions, and properties of elements and compounds.

1. IIT JEE - Past papers CHEMISTRY- UNSOLVED PAPER – I985

2. SECTION – I Single Correct Answer Type This section contains 20 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.

3. 01 Problem Bohr model can explain: The spectrum of hydrogen atom only Spectrum of an atom or ion containing one electron only The spectrum of hydrogen molecule The solar spectrum

4. Problem 02 The molecule having one unpaired electron is: NO CO CN- d.

5. Problem 03 An example of a reversible reaction is: a. b. c. d.

6. Problem 04 Rate of diffusion of a gas is: Directly proportional to its density Directly proportional to its molecular weight Directly proportional to the square root of its molecular weight Inversely proportional to the square root of its molecular weight

7. Problem 05 For a dilute solution, Raoult’s law states that: The lowering of vapour pressure is equal to the mole fraction of solute The relative lowering of vapour pressure is proportional to the amount of solute in solution The relative lowering of vapour pressure is proportional to the amount of solute in solution The vapour pressure of the solution is equal to the mole fraction of solvent

8. Solution 06 The reaction occurs in the galvanic cell: Ag|AgCl|(s) |KCl (soln) |AgNO3 (soln) |Ag PtH2 (g) |HCl (soln) | (soln) |Ag PtH2 (g) |HCl (soln) |AgCl(s) |Ag PtH2 (g) |KCl (soln) |AgCl(s) |Ag

9. Problem 07 The radius of an atomic nucleus is of the order of: cm 10-13cm 10-14cm 10-8cm

10. Problem 08 The best indicator for detection of end point in titration of a weak acid and a strong base is: Methyl orange (3 to 4) Methyl red (5 to 6) Bromothymol blue (6 to 7.5) Phenolphthalein (8 to 9.6) Note: Figures in the brackets show the pH range of the indicator

11. Problem 09 Nitrogen dioxide cannot be obtained by heating: a. b. c. d.

12. Problem 10 The oxide that gives hydrogen peroxide on treatment with a dilute acid is: a. b. c. d.

13. Problem 11 The molecular formula of Gluer's salt is : a. b. c. d.

14. Problem 12 A gas that cannot be collect over water is: a. b. c. d.

15. Problem 13 The conjugate acid of NH is: a. b. c. NH d.

16. Problem 14 Acidic hydrogen is present in: Ethyne Ethene Benzene Ethane

17. Problem 15 The compound that will not give iodoform on treatment with alkali and iodine is: Acetone Ethanol Diethyl ketone Isopropyl alcohol

18. Problem 16 Anti-Markownikoff addition of HBr is not observed in: Propene Butene But –2-ene Pent-2-ene

19. Problem 17 The compound that is not a Lewis acid is: a. b. c. d. SnCl

20. Problem 18 The compound that is most reactive towards electrophonic nitration is: Toluene Benzene Benzoic acid Nitrobenzene

21. Problem 19 Hydrogen gas will not reduce: Heated cupric oxide Heated ferric oxide Heated stannic oxide Heated aluminum oxide

22. Problem 20 Electromagnetic radiation with maximum wavelength is: Ultraviolet Radio wave X-ray Infrared

24. Problem 02 . O-Nitrogen is steam volatile whereas p- nitro phenol is not.

25. Problem 03 Formic acid is stronger acid than acetic acid.

26. Problem 04 Graphite is used as a solid lubricant.

27. Problem 05 Fluorine cannot be prepared from fluorides by chemical oxidation.

28. SECTION – III Complete the following sentences

29. 01 Problem The rate of chemical change is directly proportional to _________.

30. Problem 02 The terminal carbon atom in butane is ___________ hybridized. .

31. Problem 03 On Milliken scale, the average of ionization potential and electron affinity is known as _____________.

32. Problem 04 The number of neutrons in the parent nucleus which gives 14N on beta emission is __________.

33. Problem 05 Sodium dissolved in liquid ammonia conducts electricity because_________.

34. SECTION – IV True or false 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.

35. 01 Problem Kinetic energy of molecule is zero at C

36. Problem 02 Carbon tetrachloride is inflammable.

37. Problem 03 All molecules with polar bonds have dipole moment.

38. Problem 04 A gas in a closed container will exerts much higher pressure due to gravity at the bottom than at the top.

39. Problem 05 M-Chlorobromobenzene is an isomer of m-bromochlorobenzene.

40. Problem 06 Iodide is a better nucleophile than bromide.

41. Problem 07 ­ is nonlinear molecule.

42. Problem 08 Heat capacity of a diatomic gas is higher than that of a monatomic gas.

43. Problem 09 Addition of ammonium chloride to a solution containing ferric and magnesium ions is essential for selective precipitation of ferric hydroxide by aqueous ammonia

44. Problem 10 Solubility of sodium hydroxide increases with increase in temperature.

45. SECTION – V Arrange the following in order of their sentences

46. 01 Problem Decreasing ionic size

47. Problem 02 Increasing acidic property ZnO, MgO

48. Problem 03 Increasing first ionization potential Mg, Al, Si, Na

49. Problem 04 Increasing reactivity towards HCN , HCHO, C2H5COCH3

50. Problem 05 Increasing bond length

51. SECTION – IV Match the following

52. 01 Problem Spinel Felspar Cerussite Malachite Kisserite

53. Problem 02 Liquid air Deacon Process Parke process Nitric oxide Claude process Silver Ostwald process Chlorine Solvay process

54. Problem 03 Phenol colored glass antichlor Salicylic acid refractory material Quick lime antiseptic CuO analgesic

55. Problem 04 Aston radium Priestley radioactivity Ramsay oxygen Marie Curie inert gas Becquerel mass spectrum

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