1) The document contains an unsolved chemistry exam from 1988 consisting of multiple choice, fill-in-the-blank, matching, and ordering questions testing knowledge of chemistry concepts and principles. 2) The multiple choice sections cover topics like electronic configurations, ionization potentials, molecular structures, and acid-base chemistry. 3) Fill-in-the-blank questions require completing statements about quantum mechanics concepts, extractive metallurgy processes, and organic compound classifications. 4) Other sections include matching elements to properties, ordering substances by thermal stability or other trends, and identifying correct statements and explanations.

1. IITJEE –Past papersCHEMISTRY- UNSOLVED PAPER - 1988

2. SECTION – ISingle Correct Answer TypeThere are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate

3. 01ProblemThe triad of nuclei that is isotonic is a.b.c.d.

4. Problem02The wavelength of a spectral line for an electronic transition is inversely related tothe number of electrons undergoing the transitionthe nuclear charge of the atom the difference in the energy of the energy levels involved in the transitionthe velocity of the electron undergoing the transition

5. Problem03The orbital diagram in which the aufbau principle is violated isabcd

6. Problem04The outermost electronic configuration of the most electronegative element isns2np3ns2np4 ns2np5ns2np6

7. Problem05The first ionization potential of NA, Mg Al and Si are in the orderNa<Mg>Al<SiNa>Mg>Al>SiNa<Mg<Al>SiNa>Mg>Al<Si

8. Problem06The species in which the central atom uses hybrid orbital's in its bonding isPH3NH3CH3+SbH3

9. Problem07In a certain code. 95789 is written as EGKPT & 2436 is written as ALUR. How is 23549 written in that code. ALEUT ALGTUALGUTALGRT

10. 08ProblemThe molecule that has linear structure is CO2NO2SO2SiO2

11. Problem09The angle in 1,1,2,2-terachloroethene and terra chloromethane respectively will be about a.b.c.d.

12. Problem10The equaling weight of MnSO4 is half its molecular weight when it is converted to Mn2O3MnO2MnO4-d.

13. Problem11In the Vander Waals equation of state for non-ideal gas the term that accounts for intermolecular forces isa.b. RTc. d. (RT) -1

14. 12ProblemA bottle of dry ammonia and bottle of dry hydrogen chloride connected through a long tube are opened simultaneously at both ends ,the white ammonium chloride ring first formed will be at the centre of the tubenear the hydrogen chloride bottlenear the ammonia bottlethroughout the length of the tube

15. Problem13In which mode of expression does the concentration of a solution remain independent of temperature?MolaritiesNormalityFormalityModality

16. Problem14When equal volumes of the following solutions are mixed precipitation of will occur only with a.b.c.d.

17. Problem15The pKQ of acetylsalicylic acid (aspirin) is 3.5. The pH of gastric juice in the human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirin will beunionized in the small intestine and in the stomach completely ionized in the small intestine and in the stomachionized in the stomach and almost unionized in the small intestineionized in the small intestine and almost unionized in the stomach

18. Problem16The standard reduction potentials, ,for the half reactions are as The emf for the cell reaction is-0.35 V+0.35V+1.17V-1.17V

19. 17ProblemIn , the bond that undergoes heterolysis cleavage most readily is C-CC-OC-HO-H

20. Problem18Phenol reacts with bromine in carbon disulphide at low temperature to givem-bromophenolo-and p-bromophenolsp-bromophenol2,4,6- tribromophenol

21. Problem19The number of structural and configurationally isomers of a bromo compound, C5H9Br formed by the addition of HBr to 2-pentyne respectively are1 and 22 and 44 and 22 and 1

22. Problem20Among the following ,the lowest degree of par magnetism per mole of the compound at 298 K will be shown by a.b.c.d.

23. SECTION – IIMultiple Answer typeAmong the four answer given for each sub question, one or more is correct.

24. Problem01Potassium manganese is formed when Chlorine is passed into an aqueous solutionmanganese dioxide is fused with potassium hydroxide in air formaldehyde reacts with potassium permanganate in presence of a strong alkalipotassium permanganate reacts with Conc.sulphuric acid

25. Problem02Keto- enoltautomerism is observed ina.b.c.d.

26. Problem03The rate law for the reaction os given by Rate= .The rate of the reaction will bedouble on doubling the concentration of sodium hydroxidehalved on reducing the concentration of alkyl halide to one halfincreased on increasing the temperature of the reaction unaffected by increasing the temperature of the reaction

27. Problem04Nuclear reactions accompanied by emission of neutron (s) are a.b.c.d.

28. Problem05The statements that are true for the long form of the periodic table are:It reflects the sequence of filling the electrons in the order of sub-energy levels s,p,d and f.It helps predict the stable valiancy states of the elements It reflects trends in physical and chemical properties of the elements.It helps predict the relative ionicity of the bond between any two elements.

29. SECTION – IIIFill in the blanks Choosing appropriate words given within brackets against each statement

30. Problem01The uncertainty principle and the concept of wave nature of matter were proposed by ____________ , and _____________ respectively.(Heisenberg ,Schrodinger, Maxwell, de Broglie)

31. Problem02In extractive metallurgy of zinc, partial fusion of ZnO with coke is called _______ and reduction of the ore to the molten metal is called _________.(smelting, calcining, roasting sintering)

32. Problem03Isomers which are _________ mirror images are known as.( super imposable, non-superimposable, enantiomers, diastructural, espiers.)

33. Problem04The salts _______ and __________ are is structural.(FeSO4-7H2O; CuSO4-5H2O; MnSO4-4H2O;ZnSO4-7H2O)

34. Problem05________ ,acid gives hypo _________ ion.( Hydrotropic, Hypobromous, perbrpomic, bromide, bromide, perbromate )

35. SECTION – IVMATCH THE FOLLOWING Each entry in columns X in the same way related to the entries in columns Y and Z

36. Problem01

37. Problem02

38. SECTION – VArrange the following in each sub question as indicated

39. Problem01 in increasing order of thermal stability.

40. Problem02n-butane, n-butanol, n-butyl chloride, isobutane in increasing order of boiling point.

41. Problem03N2,O2,F2,Cl2 in increasing order of bond dissociation energy

42. Problem04benzene, toluene, methoxybenzene, chlorbenzene in increasing order of reactivity towards sulphonation with fuming sulphuric acid.

43. Problem05 in the order of increasing acidic character.

44. Problem06methylamine, dimethylamine , aniline, N-methylaniline in increase order of base strength.

45. SECTION – VIIn each sub question Below a statement (S) is given which may be correct or wrong.For each statement an explanation (E) is given which may be correct or wrong. Choose the correct answer from the code a,b,c,d given for each sub question

46. Problem01Statement (S):If a strong acid is added to a solution of potassoium chromate it changes its colour from yellow to orange.Explanation (E):The colour change is due to the oxidation of potassium chromate.Code:Both (S) and (E) are correct and (E) is the correct explanation of (S)Both (S) and (E) are correct but (E) is not the correct explanation of (S)(S) is correct but (E) is wrong.(S) is wrong but (E) is correct.

47. Problem02Statement (S) :Solubility of n-alcohols in water decreases with increase in water decreases with increase in molecular weight.Explanation (E): The relative proportion of the hydrocarbon part in alcohols increases with increasing molecular weight which permits enhanced hydrogen bonding with water.Code:Both (S) and (E) are correct and (E) is correct explanation of (S)Both (S) and (E) are correct but (E) is not the correct explanation of (S)(S) is correct but (E) is wrong(S) is wrong but (E) is correct.

48. FOR SOLUTION VISIT WWW.VASISTA.NET