IIT JEE Chemistry 1990


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IIT JEE Chemistry 1990

  1. 1. IIT JEE - Past papers<br />CHEMISTRY- UNSOLVED PAPER – I990<br />
  2. 2. SECTION – I<br />Single Correct Answer Type<br />This section contains 10 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 />Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives<br />O-Cresol<br />P-Cresol<br />2, 4 Dihydroxytoluene<br />Benzoic acid <br />
  4. 4. Problem <br />02<br />Amongst the following, the most basic compound is<br />Benzylamine<br />Aniline <br />Acetanilide<br />P-Nitroaniline<br />
  5. 5. Problem<br />03<br />The density of neon will be highest at<br />STP<br />, 2 atm<br /> , 1 atm<br /> , 2 atm<br />
  6. 6. Problem<br />04<br />The oxidation number of phosphorus is Ba is<br />+3<br />+2<br />+1<br />-1<br />
  7. 7. Problem<br />05<br />The embolic from of acetone contains <br />9 sigma bonds, 1 pi bond and 2 lone pairs<br />8 sigma bonds, 2 pi bond and 2 lone pairs<br />10 sigma bonds, 1 pi bond and 1 lone pairs<br />9 sigma bonds, 2 pi bond and 1 lone pairs<br />
  8. 8. Problem<br />06<br />The freezing point of equimolal aqueous solutions will be highest for<br />a . (aniline hydrochloride)<br />b.<br />c. <br />d. (glucose)<br />
  9. 9. Problem<br />07<br />Amongst the following elements (whose electronic configurations are given below), the one having the highest ionization energy is <br /> <br />a.<br />b.<br />c.<br />d.<br />
  10. 10. Problem<br />08<br />The formation of cyanohydrin from a ketone is an example of<br />Electrophonic addition <br />Nucleophilic addition <br />Nucleophilic substitution <br />Electrophonic substitution <br />
  11. 11. Problem<br />09<br />Amongst the following hydroxides, the one which has the lowest value of at ordinary temperature (about 25 0C) is<br />a.<br />b.<br />c.<br />d.<br />
  12. 12. Problem<br />10<br />The rate of diffusion of methane at a given temperature is twice that of gas X. The molecular weight of X is <br />64.0<br />32.0<br />4.0<br />8.0<br />
  13. 13. SECTION – II<br />Multiple Answer Type<br /><ul><li>There are five parts in this equation. Each part has one or more than one correct answers. Indicate all correct answers for each part by writing the corresponding letters from (a), (b), (c), (d) in the answer book: </li></li></ul><li>01<br />Problem<br />Aryl halides are less reactive towards nucleophilic substitution reaction as compared to alkyl halides due to <br />The formation of less stable carbonium ion <br />Resonance stabilization <br />Longer carbon-halogen bond <br />The inductive effect<br />Sp2 hybridized carbon attached to the halogen<br />
  14. 14. Problem <br />02<br />The compounds used as refrigerant are<br />a.<br />b.<br />c.<br />d.<br />e.<br />
  15. 15. Problem<br />03<br />When zeolite, which is hydrated sodium aluminum silicate, is treated with hard water the sodium ions are exchanged with <br />H+ ions<br />b. Ions<br />c. ions<br /> Ions<br />e. ions<br />
  16. 16. Problem<br />04<br />The aqueous solutions of the following salts will be colored in the case of<br /> a.<br />b.<br />c.<br />d.<br />e. Potash alum<br />
  17. 17. Problem<br />05<br />Of the following, the metals that cannot be obtained by electrolysis of the aqueous solution of their salts are <br />Ag<br />Mg<br />Cu<br />Al<br />Cr<br />
  18. 18. SECTION – III<br />Fill in the blanks<br />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<br />
  19. 19. 01<br />Problem<br />The shape of [OH3] + is _______________.<br />
  20. 20. Problem <br />02<br />The valence atomic orditals on C in silver acetylide is _____________ hybridized.<br />
  21. 21. Problem<br />03<br />The basicity of phosphorous acid is _________________.<br />
  22. 22. Problem<br />04<br />Phenol is acidic because of resonance stabilization of its conjugate base, namely, _______________.<br />
  23. 23. Problem<br />05<br />Fehling’s solution ‘A’ consists of an aqueous solution of copper sulphate, while Fehling’s solution ‘B’ consists of an alkaline solution of ______________.<br />
  24. 24. SECTION – IV<br />True of 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 />
  25. 25. 01<br />Problem<br />The presence of polar bonds in a polyatomic molecule suggests that the molecule has non-zero dipole moment.<br />
  26. 26. Problem <br />02<br />2, 3, 4-Thrichloropentane has three asymmetric carbon atoms.<br />
  27. 27. Problem<br />03<br />During 1 reaction, the leaving group leaves the molecule before the incoming group is attached to the molecule,<br />
  28. 28. Problem<br />04<br />In - emission from a nucleus the atomic number of the daughter element decreases by one.<br />
  29. 29. Problem<br />05<br />The rate of an exothermic reaction increases with increasing temperature.<br />