This document contains an unsolved practice paper for the IITJEE chemistry exam from 1999. It consists of 25 single answer multiple choice questions in Section I and 10 multiple answer questions in Section II covering various chemistry concepts. The questions test knowledge of topics like quantum numbers, nuclear reactions, gas laws, acid-base chemistry, coordination compounds, and organic chemistry reactions.

1. IITJEE –Past papersCHEMISTRY- UNSOLVED PAPER - 1999

2. SECTION – ISingle Correct Answer TypeSelect the most appropriate alternative a,b,c or d in questions 1-25.

3. 01ProblemThe electrons, identified by quantum umbers can be placed in order of increasing energy, from the lowest to highest, as(iv) < (ii) < (iii) < (i)(ii) < (iv) < (i) < (iii)(i) < (iii) < (ii) < (iv)(iii) < (i) < (iv) < (ii)

4. Problem02The number of neutrons accompanying the formation of from the absorption of a slow neutron by ,followed by nuclear fission is,0213

5. Problem03The correct order of increase in bond length isa.b.c.d.

6. Problem04A gas will approach ideal behaviors atlow temperature and low pressurelow temperature and high pressurehigh temperature and low pressurehigh temperature and high pressure

7. Problem05The normality of 0.3 M phosphorous acid is,0.10.90.30.6

8. Problem06The coordination number of a metal crystallizing in a hexagonal close packed structure is12486

9. Problem07A gas X at 1 atm is bubbled through a solution containing a mixture of 1 If the reduction potential of Z>Y>X, thenY will oxidize X and not ZY will oxidize Z and not XY will oxidize both X and ZY will reduce both X and Z

10. 08ProblemThe pH of 0.1 M solution of the following salts increases in the order.a.b.c.d.

11. Problem09For the chemical reaction ,the amount of X3Y at equilibrium is affected bytemperature and pressuretemperature onlypressure onlytemperature, pressure and catalyst

12. Problem10In the dichromate dianion, bonds are equivalent bonds are equivalent all bonds are equivalentall bonds are nonequivalent

13. Problem11One mole of calcium phosphide on reaction with excess water givesone mole of phosphinetwo moles of phosphoric acidtwo moles of phosphineone mole of phosphorus pentoxide

14. 12ProblemThe oxidation number of sulphur in respectively, are0,+1 and -2+2,+1 and -20, + 1 and +2-2, +1 and -2

15. Problem13On heating ammonium dichromate, the gas evolves isoxygenammonianitrous oxidenitrogen

16. Problem14In the commercial electrochemical process for aluminum extraction the electrolyte used is in NaOH solutionan aqueous solution of a molten mixture of a molten mixture of

17. Problem15The geometry of and its dipole moment areangular and nonzeroangular and zerolinear and nonzerolinear and zero

18. Problem16The geometry of areboth square planartetrahedral and square planar, respectively both tetrahedralsquare planar and tetrahedral, respectively

19. 17ProblemIn compounds of type where E=B,P. AsorBi, the angles for different E are in the orderB > P = As = BiB > P > As > BiB > P = As = BiB > P < As < Bi

20. Problem18In the compound bond is of the type,a.b.c.d.

21. Problem19When prop ionic acid is treated with aqueous sodium bicarbonate, is liberated. The ‘C’ of comes frommethyl groupcarboxylic acid groupmethylene groupbicarbonate

22. Problem20The enol form of acetone, after treatment with ,gives:a.b.c.d.

23. Problem21A positive carbylamines test is given byN,N-dimethylaniline2,4-dimethylanilineN-methyl-o-methylanilinep-methylbenzylamine

24. Problem22The optically active tartaric acid is named as D-(+)-tartaric acid because it has a positiveoptical rotation and is derived from D-glucosepH in organic solventoptical rotation and is derived from D-(+)-glyceraldehydeoptical rotation only when sybstituted by deuterium

25. Problem23A solution of (+)-2-chloro-2-phenylenthane in toluene racemises slowly in the presence of small amount of ,due to the formation ofcar anioncarbinefree-radicalcarbonation

26. Problem24The product(s) obtained via oxymercuration of 1-butyne would be

27. Problem25The most unlikely representation of resonance structures of p-nitrophenoxide ion isa.b.c.d.

28. SECTION – IIMultiple Correct AnswerQuestion numbers 1-10 more then one correct answer.

29. Problem01The ether when treated with HI producesa.b.c.d.

30. Problem02Toluene when treated with ,gives p-bromotoluene as the major product because the groupis Para directingis meta directingactivates the ring by hyper conjugationdeactivates the ring

31. Problem03The following statement(s) is (are) correct:A plot of log Kp versus 1/T is linearA plot of log[X]versus time is linear for a first order reaction A plot of log p versus 1/T is linear at constant volumeA plot of p vesus 1/V is linear at constant temperature

32. Problem04The following is (are) endothermic reaction(s):Combustion of methaneDecomposition of waterDehydrogenation of ethane to ethyleneConversion of graphite to diamond

33. Problem05Ground state electronic configuration of nitrogen atom can be represented bya.b.c.d.

34. Problem06In the depression of freezing point experiment ,it is found that thevapour pressure of the solution is less than that of pure solventvapour pressure of the solution is more than that of pure solventonly solute molecules solidify at the freezing point only solvent molecules solidify at the freezing point

35. Problem07Ionic radii ofa.b.c.d.

36. Problem08Ammonia, on reaction with hypochlorite anion, can form a.b.c.d.

37. Problem09A buffer solution can be prepared from a mixture ofsodium acetate and acetic acid in watersodium acetate and acetic hydrochloric acid in waterammonia and ammonium chloride in waterammonia and sodium hydroxide in water

38. Problem10An aromatic molecule willhave electronshave electronsbe planarbe cyclic

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