This document contains a 50 question chemistry exam with multiple choice answers for each question. The exam covers topics such as reaction types, chemical properties, molecular structures, oxidation states, and more. Each question provides 4 possible answer choices with only one being correct. Candidates are asked to indicate their choice of the correct answer in their answer book.

1. AFMC–Past papersCHEMISTRY - UNSOLVED PAPER - 1999

2. SECTION – I (Total Marks :50)Single 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 reaction CH2 = CHCH3 + HBr -> CH3CHBrCH3, is a type ofFree radical addition reactionElectrophilic substitution reactionElectrophilic addition reactionNucleophilic addition reaction

4. Problem02Which of the following set has the strongest tendency to form anions?Ga, In and TNa, Mg and A1N, O and FV, Cr and Mn

5. Problem03Baeyer's reagent is used in the laboratory forOxidation processDetection of glucoseDetection of double bondReduction process

6. Problem04Oxidation of acetaldehyde with selenium dioxide producesGlyoxalOxalic acidEthanoic acidMethanoic acid

7. Problem05Which of the following is the most stable oxidation state of aluminium?+2+1-1+3

8. Problem06When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it producesNitrobenzeneP-chlorovinyidichloroarsincLewisite Both (b) and (c)

9. Problem07Emery consists ofPurest form of ironImpure corundumImpure carborundumImpure graphite

10. Problem08Which of the following is the monomer of natural rubber?IsopreneAdipic acidGlycol Ethylene

11. Problem09The structure of DNA isTriple helixLinearSingle helixDouble helix

12. Problem10Which of the following statements is true for fuel cells?They are free from pollutionThey run till the reactant are activeThey are more efficientAll of these

13. Problem11Chloroform on treatment with concentrated HN03 , givesCHCl2NO3CHCIHNO3CHC12NO2CC13NO2

14. Problem12Which of the following will not displace hydrogen?BaPbSnHg

15. Problem13When primary alcohol is oxidised with chlorine, it givesHCHOCH3CHOCC13CHOC3H7CHO

16. Problem14The Beilstein test for organic compounds is used to detectCarbonHalogensNitrogenSulphur

17. Problem15In the reaction HN03 + P4O10 4HPO3 + X, the product X isN2O5H2ONO2N2O3

18. Problem16The oxidation of toluene to benzaldehyde by chromyl chloride is calledEtard reaction Fittig reactionRosenmund reactionWurtz reaction

19. Problem17Which of the following halogen is solid at room temperature?IodineBromineFluorineChlorine

20. Problem18Heating a mixture of sodium benzoate and soda lime givesBenzeneCalcium benzoateMethane Sodium benzoate

21. Problem19Nylon-66 is made by usingAdipic acidSuccinic acidPhenolBenzaldehyde

22. Problem20Half-life of radium is 1580 years, its average life will be2.5 x 103 years 2.275 x 103 years8.25 x 102 years1.8 x 103 years

23. Problem21Nessler's reagent is represented byK2[HgI4] HgOHgI2K2[HgI2]Hgl2

24. Problem22Which of the following has the highest boiling point?n-octaneButanePentane Ethane

25. Problem23Which of the following is the most electronegative?CoCuNiFe

26. Problem24The half-life of 6C14 if its decay constant (λ) is 2.31 x 10-4 is3.5 x 104 year3 x 103 year2 x 102 year 4 x 103 year.

27. Problem25The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is6.63 x 10-33 m6.63 x 10-34 m6.63 x 10-35 m6.65 x 10-35 m.

28. Problem26How many gram of dibasic acid (molecular weight = 200) should be present in 100 ml of the aqueous solution to give strength 0.1 N?2g 1g5g10g

29. Problem27Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in its 35 g. Molecular mass of anthracite is {Kb for CHC13 = 3.9 K-kg mol-1)132.32 g/mol 242.32 g/mol177.42 g/mol79.42 g/mol

30. Problem28The oxidation state of chromium in potassium dichromate (K2Cr2O7) is+2 -2-5+6

31. Problem29The compound containing co-ordinate "bond isSO3H2SO4O3 All of these

32. Problem30The correct order of reactivity of halogen isF > CI > Br > IF < CI < Br < IF < CI > Br > IF > CI < Br < I

33. Problem31Ratio of the energy of a photon of wavelengths 3000 A and 6000 A is1 : 21 : 33 : 12 : 1

34. Problem32In the manufacture of NH3, the most favorable condition isLow temperature and high pressureHigh temperature and low pressureHigh temperature and high pressureHigh temperature and low pressure

35. Problem33The molecular formula of crinoline isNa3AlF6Na2Al2O3Fe3O4All of these

36. Problem34Calcium format, on dry heating, yieldsAcetic acidAcetaldehydeAcetone Formaldehyde

37. Problem35Carnalite has which of the following composition?Fe3O4Na3AlF6KCl-MgCl2-6H2ONa2AlF5

38. Problem36The acid formed, when iodine reacts with concentrated nitric acid, isIodic acidNitrous acidHydroiodic acid Per-iodic acid

39. Problem37Magnetic quantum number specifiesSize of orbitalsShape of orbitalNuclear stabilityOrientation of orbitals

40. Problem38According to Bohr's theory of hydrogen atom, which of the following is quantised for an electron?AccelerationVelocityAngular momentumAngular acceleration

41. Problem39The volume of a gas measured at 27°C and 1 atm pressure is 10 litres. What final temperature would be required to reduce the volume to 5 litres at 1 atm pressure?450 K100°C150 K327 K

42. Problem40The number of electrons in [19K40]-1 is181920 40

43. Problem41Aufbau principle is obeyed in which of the following electronic configurations?Is2 2s22p6Is2 3p6 3s21s2 3s23p6 Is2 2s2 3s2

44. Problem42Which of the following substances is used, in laboratory, for fast drying of neutral gases?Phosphorus pent oxideAnhydrous calcium chlorideActive charcoalSodium phosphate

45. Problem43In which of the following hydrocarbons, hydrogen is most acidic?CH2 = CH2CH = CHCH3 - CH3None of these

46. Problem44Tyndall effect can be observed in aSolventPrecipitateColloidal solutionSolution

47. Problem45A base, as defined by Bronzed theory, is a substance which canGain a pair of electronsAccept protonsLose a pair of electronsDonate protons

48. Problem46In the preparation of sulphuric acid, V205 is used in the reaction. It isN2 + 3H2-> 2NH32SO2 + O2 -> 2SO3SO2 + H2O ->H2SO4S + O2 ->S02

49. Problem47Empirical formula of a compound is CH2O. If its molecular weight is 180, then the molecular formula of the compound isC3H6O3C4H8O4C6H12OC5H10O5.

50. Problem48The compound CH3 – O-C3H7 and C2H5 - O - C2H5 exhibitMesmerism Chain isomerismOptical isomerism Cis-trans isomerism

51. Problem49Solutions with same osmotic pressure are calledIsotonicHypertonicNormalNone of these

52. Problem50pH value of a solution, whose hydronium ion concentration is 6.2 x 10-9 mol/1 is7.757.218.216.21

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