1) The document contains a past paper from 1998 for the IIT JEE chemistry exam with 38 multiple choice and reasoning type questions covering various chemistry concepts. 2) The questions cover topics such as reactions and products (questions 1, 11, 15), electronic configurations (questions 5, 10, 22), isomerism (questions 16, 35), acid-base chemistry (questions 28, 38), and properties of elements and compounds (questions 6, 21, 29, 37). 3) The reasoning questions (29-40) contain an assertion and reason and require evaluating whether the assertion and/or reason are correct and if the reason explains the assertion.

1. IIT JEE –Past papersCHEMISTRY - UNSOLVED PAPER - 1998

2. SECTION – IMORE THAN ANSWER TYPE

3. 01ProblemWhich of the following statements(s) is (are)correct when a mixture of is gently warmed with conc. ?A deep red vapour is evolvedThe vapour when passed into solution gives a yellow solution of Chlorine gas is evolvedchromyl vhloride is formed

4. Problem02Highly pure dilute solution of sodium in liquid ammoniashows blue colourexhibits electrical conductivity productes sodium amideproduces hydrogen gas

5. Problem03The reaction of with HBR givesCH3CHBr Ch2 OHCH3CH2CHBr OHCH3CHBrCH2 BrCH3CH2CHBr Br

6. Problem04Chloroaniline and anilinium hydrochloride can be distinguished bySandmeyer reaction Carbylamine test

7. Problem05The energy of an electron in the first Bhor orbit of H atom is -13.6eV.The possible energy value(s) of the excited state (s) for electrons in Bohr orbits of hydrogen is (are)-3.4eV-4.2eV-6.8eV+6.8eV

8. Problem06In nitroprusside ion the iron and No exist as rather and NO.these forms can be differentiated byestimating the concentration of ironmeasuring the concentration of CNmeasuring the soild state magnetic momentthermally decomposing the compound

9. Problem07Which of the following statement (s) is (are) correct?The coordination number of each type of ion in CsCl crystal is 8.A metal that crystallizes in bcc structure has a coordination number of 12A unit cell of an ionic crystal shares some of its ions with other unit cells.The length of the unit cell in is 552 pm.

10. 08ProblemSodium nitrate decomposes above to givea.b.c.d.

11. Problem09Which of the following statements(s) is(are)correct with reference to the ferrous and ferric ions? gives brown colour with potassium ferricyanide. gives blue precipite with potassium ferricyanide gives red colurwith potassium thiocyanate. gives brown colur with ammonium thiocyanate.

12. Problem10Which of the following statement(s) is (are) correct ?The electronic configuration of (Atomic number of Cr=24)The magnetic quantum number may have a negative value.In silver atom,23 electrons have a spin of one type and 24 of the opposite type.(Atomic Number of Ag=47.)The oxidation state of nitrogen in is-3

13. Problem11A new carbon-carbon bond formation is possible inCannizzaro reactionFriedel-Crafts alkylationClemmensen reductionReimer-Tiemann reaction

14. 12ProblemWhite phosphorus hassixP-P single bondsfour P-P single bondsfour lone pairs of electrons PPP angle of

15. Problem13Which of the following will react with water ?a.b.c.d.

16. Problem14The standard reduction potential values of three metallic captions, X,Y,Z are 0.52,-3.03 and -1.18 V respectively. The order of reducing power of the corresponding metals isY > Z > XX > Y > ZZ > Y > XZ > X > Y

17. Problem15Among the following compounds, which will react with acetone to give a product containing ?a.b.c.d.

18. Problem16Which of the following compounds will show geometrical isomerism?2-butenepropane1-phenylpropene2-methyl-2-butene

19. 17ProblemThe geometry and the type of hybird orbital present about the central atom in islinear,sptrigonal planar, tetrahedral, pyramidal,

20. Problem18Benzyl choride (C6H5C2HCI) can be prepared from toluene by chlorination with SO2CI2SOCI2CI2NaOCI

21. Problem19Which of the following will undergo aldol condensation?acetaldehydepropanaldehydebenzaldehydetrideuteroacetaldehyde

22. Problem20Addition of high proportions of manganese makes steel useful in making rails of railroads, because manganesegives hardness to steelhelps the formation of oxides of ironcan remove oxygen and sculpturecan show highest oxidation state of +7

23. Problem21Decrease in atomic number is observed during alpha emissionbeta emissionpositron emission electron capture

24. Problem22Benzendiazonium chloride on reaction with phenol in weakly basic medium givesdiphenyl etherp-hydroxyazobenzenechlorobenzenebenzene

25. Problem23Among the following compounds, the strongest acid isa.b.c.d.

26. Problem24For a first order reaction,the degree of dissociation is equal to a polt of reciprocal concentration of the reactant vs.time gives a straight linethe time taken for the completion of 75% reaction is thrice the of the reactionthe pre-exponential factor in the Arrhenius equation has the dimension of time,

27. Problem25Tautomerism is exhibited bya. b. c.d.

28. Problem26According to Graham’s law at a given temperature the ratio of the rates of diffusion of gases A and B is given by a.b.c.d.

29. Problem27For the reaction at a given temperature the equilibrium amount of can be increased by adding a suitable catalystadding an inert gasdecreasing the volume of the containerincreasing the amount of

30. Problem28Which of the following statement (s)is (are) correct?The solution of HCl is 8The conjugate base of Autoprotolysis constant of water increases with temperatureWhen a solution of a weak monoprotic acid is titrated against a strong base,at half-neutralisation point

31. SECTION – IIREASON TYPE QUESTIONThe questions below (29 to40)consist of an assertion in column 1 and the reason in column 2.Against the specific question number, write in the appropriate space.

32. Problem29Benzonitrile is prepared by the Cyanide is a strong nucleophile.reactionof chlorobenzenewith Potassium cyanide.If both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertionIf assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

33. Problem30Fatom has a less negative Additional electrons are repelled more effectivelelectrons affinity than Cl by 3p elecrons in Cl atom than by ep electrons in atom. F atom.If both assertion and reason are correct ,and reson is the correct explanation of the assertion.If both assertion and reason are correct,but reason is not the correct eplanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

34. Problem31Nuclide is less stable than Nuclides having odd number of protons and neutrons are generally unstable.If both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct eplanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

35. Problem32 is amphoteric in nature bonds canbe broken with equal ease in .If both assertion and reason are correct ,and reson is the correct explanation of the assertion.If both assertion and reason are correct,but reason is not the correct eplanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

36. Problem33The value of van der Waals' constant Hydrogen bonding is present in ‘a’ is larger for ammonia than for nitrogen. ammoniaIf both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct eplanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

37. Problem34 is diamagnetic. The electrons are lost from 4s orbital to form If both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

38. Problem35Addition of to 1-butene gives The product contains one asymmetric two optical isomers. carbon. If both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

39. Problem36The electronic structure of structure is not allowed because octet around is cannot be expandedIf both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

40. Problem37LiCl is predominantly a covalent Electro negativity difference between Li compound and Cl is too small.If both assertion and reason are correct ,and resson is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

41. Problem38 is stronger acid than In there are two nitrogen-to-oxygen bonds whereas in there is only one.If both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

42. Problem39Sulphate is estimated as Ionic radius of is smaller than that of and not as . .If both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

43. Problem40Acetic acid does not undergo Acetic acid has no alpha hydrogen's. halo form reaction.If both assertion and reason are correct ,and reason is the correct explanation of the assertion.If both assertion and reason are correct, but reason is not the correct explanation of the assertion.If assertion is correct but reason is incorrect.If assertion is incorrect but reason is correct.

44. FOR SOLUTION VISIT WWW.VASISTA.NET