1. IIT JEE - Past papers CHEMISTRY- UNSOLVED PAPER – I986

2. SECTION –I Single 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 Rutherford’s alpha particle scattering experiment eventually led to the conclusion that: Mass and energy are related Electrons occupy space around the nucleus Neutrons are buried deep in the nucleus The point of impact with mater can be precisely determined

4. Problem 02 The bond between two identical non-metal atoms has a pair of electrons: Unequally shared between the two Transferred fully from one atom to another With identical spins Equally shared between them

5. Problem 03 Which one of the following sets of quantum number represents as impossible arrangements? 3 2 -2 1/2 4 0 0 1/2 3 2 -3 1/2 5 3 0 -1/2

6. Problem 04 The compound insoluble in acetic acid is: Calcium oxide Calcium carbonate Calcium oxalate Calcium hydroxide

7. Problem 05 The pair of compounds which cannot exist together in solution is: and Noah and and Noah and NaCl

8. Problem 06 The compound whose 0.1 M solution is basic is: Ammonium acetate Ammonium chloride Ammonium sulphate Sodium acetate

9. Problem 07 The average velocity of an ideal gas molecules at is 0.3 m/s. The average speed at will be. 0.6 m/s 0.3 m/s 0.9 m/s 3.0 m/s

10. Problem 08 One molal solution is one that contains one mole of a solute in: 1000 g of solvent One liter of the solvent One liter of the solution 22.4 liters of the solution

11. Problem 09 As isomer of ethanol is: Methanol Diethyl ether Acetone Diethyl ether

12. Problem 10 Which one among the following pairs of ions cannot be separated by H2S in dilute hydrochloric acid? a. b. c. d.

13. Problem 11 The compound which gives off oxygen on moderate heating is: Cupric oxide Mercuric oxide Zinc oxide Aluminum oxide

14. Problem 12 The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000Å radiation is: 1/4 4 1/2 2

15. Problem 13 The half-life period of a radioactive element is 140 days. After 560 days, one gram of the element will reduce to: (1/2) g (1/4) g (1/8) g (1/16) g

16. Problem 14 The hydrogen bond is strongest in: -H …S S – H …O F – H …S F – H …O

17. Problem 15 The hybridization of sculpture dioxide is: a. Sp b. c. d.

18. Problem 16 HBr reacts fastest with – 2 – methylpropan-2-o1 propan-1-o1 Propan-2-o1 2 – methylpropan-1-o1

19. Problem 17 The reaction of toluene with chlorine in presence of ferric chloride gives predominantly- Benzyl chloride M-chlorotoluene Benzyl chloride o-and p-chlorotoluene

20. Problem 18 The reaction conditions leading to the best yields of are:

21. Problem 19 The highest boiling point is expect for – Isooctane N-octane 2, 2, 3, 3-tetramethylbutane N-butane

22. Problem 20 The bonds present in are – Only ionic Covalent and coordinate Only covalent Covalent and ionic

23. SECTION – II MultipleAnswer Type This section contains 8 multiple choice questions. Each question has four choices (A), (B), (C) and (D).

24. 01 Problem If a gas is expanded at constant temperature- The pressure decreases The kinetic energy of the molecules remains the same The kinetic energy of the molecules decreases The number of molecules of the gas increases

25. Problem 02 When is heated in a closed vessel, oxygen is liberated and NaNO2 is left behind. At equilibrium: Addition of NaNO2 favors reverse reaction Addition of NaNO3 favours forward reaction Increasing temperature favours forward reaction Increasing pressure favours reverse reaction

26. Problem 03 Phenol is less acidic than: Acetic acid P-methoxyphenol P-nitrophenol Ethanol

27. Problem 04 Dipole moment is shown by: 1, 4-dichlorodenzene Cis-1, 2-dichloroethene Trans-1, 2-dichloroethene 1, 2-dichloro-2-pentene

28. Problem 05 Only two isometric monochloro derivatives are possible for: N-butane 2, 4-dimethylpentane Benzene 2-methylpropane

29. Problem 06 is isostructural with: a. b. c. d.

30. Problem 07 The sum of the number of neutrons and proton in the isotope of hydrogen is: 6 5 4 3

31. Problem 08 In the electrolysis of alumina, cryolyte is added to: Lower the melting point of alumina Increase the electrical conductivity Minimize the anode effect Remove the anode effect

32. SECTION – III Fill in the blanks Read the following statements carefully. Indicate the subdivision number and write the matter corresponding to the blanks strictly in the order they appear in the statement.

33. 01 Problem The rate of diffusion of a gas is _______________ proportional to the square root of molecular mass.

34. Problem 02 The more ___________ the standard reduction potential, the ________________ is its ability to displace hydrogen from acids

35. Problem 03 The hydrolysis of ethyl acetate in ________________ medium is a ______________ order reaction.

36. Problem 04 A ________________ idol has two hydroxyl groups on ______________ carbon atoms.

37. SECTION – IV TRUE or FALSE

38. 01 Problem The softness of a group IA metals increases down the group with increasing atomic number.

39. Problem 02 Sodium ethoxide is prepared by reacting ethanol with aqueous sodium hydroxide.

40. Problem 03 For a first order reaction, the rate of the reaction doubles as the concentration of the reactant(s) doubles.

41. Problem 04 The electron density in the xy plane in orbital is zero.

42. SECTION – V Give reasons in ONE or TWO sentences for each of the following:

43. 01 Problem Hydrogen peroxide is a better oxidizing agent than water.

44. Problem 02 Most transition Meta compounds are coloured.

45. Problem 03 Hydrazones of aldehydes and ketones are not prepared in highly acidic medium.

46. Problem 04 Acetic acid is less acidic in sodium acetate solution than in sodium chloride solution.

47. SECTION – VI Arrange the following in the order

48. 01 Problem Increasing size , , Ar ,

49. Problem 02 Increasing acid strength , , HClO

50. Problem 03 Increasing basicity P-touidine, N, N-dimethyl-p-toludine, p-nitroaniline, aniline

51. Problem 04 Increasing bond strength HCl, HBr, HF, HI

52. Problem 05 Increasing oxidation number of iodine I2, HI, , ICl

53. Problem 06 Increasing ease of hydrolysis , , ,

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