AFMC Chemistry 1999

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AFMC Chemistry 1999

  1. 1. AFMC–Past papers<br />CHEMISTRY - UNSOLVED PAPER - 1999<br />
  2. 2. SECTION – I (Total Marks :50)<br />Single Correct Answer Type<br />There 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<br />
  3. 3. 01<br />Problem<br />The reaction CH2 = CHCH3 + HBr -> CH3CHBrCH3, is a type of<br />Free radical addition reaction<br />Electrophilic substitution reaction<br />Electrophilic addition reaction<br />Nucleophilic addition reaction<br />
  4. 4. Problem<br />02<br />Which of the following set has the strongest tendency to form anions?<br />Ga, In and T<br />Na, Mg and A1<br />N, O and F<br />V, Cr and Mn<br />
  5. 5. Problem<br />03<br />Baeyer's reagent is used in the laboratory for<br />Oxidation process<br />Detection of glucose<br />Detection of double bond<br />Reduction process<br />
  6. 6. Problem<br />04<br />Oxidation of acetaldehyde with selenium dioxide produces<br />Glyoxal<br />Oxalic acid<br />Ethanoic acid<br />Methanoic acid<br />
  7. 7. Problem<br />05<br />Which of the following is the most stable oxidation state of aluminium?<br />+2<br />+1<br />-1<br />+3<br />
  8. 8. Problem<br />06<br />When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces<br />Nitrobenzene<br />P-chlorovinyidichloroarsinc<br />Lewisite <br />Both (b) and (c)<br />
  9. 9. Problem<br />07<br />Emery consists of<br />Purest form of iron<br />Impure corundum<br />Impure carborundum<br />Impure graphite<br />
  10. 10. Problem<br />08<br />Which of the following is the monomer of natural rubber?<br />Isoprene<br />Adipic acid<br />Glycol <br />Ethylene<br />
  11. 11. Problem<br />09<br />The structure of DNA is<br />Triple helix<br />Linear<br />Single helix<br />Double helix<br />
  12. 12. Problem<br />10<br />Which of the following statements is true for fuel cells?<br />They are free from pollution<br />They run till the reactant are active<br />They are more efficient<br />All of these<br />
  13. 13. Problem<br />11<br />Chloroform on treatment with concentrated HN03 , gives<br />CHCl2NO3<br />CHCIHNO3<br />CHC12NO2<br />CC13NO2<br />
  14. 14. Problem<br />12<br />Which of the following will not displace hydrogen?<br />Ba<br />Pb<br />Sn<br />Hg<br />
  15. 15. Problem<br />13<br />When primary alcohol is oxidised with chlorine, it gives<br />HCHO<br />CH3CHO<br />CC13CHO<br />C3H7CHO<br />
  16. 16. Problem<br />14<br />The Beilstein test for organic compounds is used to detect<br />Carbon<br />Halogens<br />Nitrogen<br />Sulphur<br />
  17. 17. Problem<br />15<br />In the reaction HN03 + P4O10 4HPO3 + X, the product X is<br />N2O5<br />H2O<br />NO2<br />N2O3<br />
  18. 18. Problem<br />16<br />The oxidation of toluene to benzaldehyde by chromyl chloride is called<br />Etard reaction <br />Fittig reaction<br />Rosenmund reaction<br />Wurtz reaction<br />
  19. 19. Problem<br />17<br />Which of the following halogen is solid at room temperature?<br />Iodine<br />Bromine<br />Fluorine<br />Chlorine<br />
  20. 20. Problem<br />18<br />Heating a mixture of sodium benzoate and soda lime gives<br />Benzene<br />Calcium benzoate<br />Methane <br />Sodium benzoate<br />
  21. 21. Problem<br />19<br />Nylon-66 is made by using<br />Adipic acid<br />Succinic acid<br />Phenol<br />Benzaldehyde<br />
  22. 22. Problem<br />20<br />Half-life of radium is 1580 years, its average life will be<br />2.5 x 103 years <br />2.275 x 103 years<br />8.25 x 102 years<br />1.8 x 103 years<br />
  23. 23. Problem<br />21<br />Nessler's reagent is represented by<br />K2[HgI4] <br />HgOHgI2<br />K2[HgI2]<br />Hgl2<br />
  24. 24. Problem<br />22<br />Which of the following has the highest boiling point?<br />n-octane<br />Butane<br />Pentane <br />Ethane<br />
  25. 25. Problem<br />23<br />Which of the following is the most electronegative?<br />Co<br />Cu<br />Ni<br />Fe<br />
  26. 26. Problem<br />24<br />The half-life of 6C14 if its decay constant (λ) is 2.31 x 10-4 is<br />3.5 x 104 year<br />3 x 103 year<br />2 x 102 year <br />4 x 103 year.<br />
  27. 27. Problem<br />25<br />The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is<br />6.63 x 10-33 m<br />6.63 x 10-34 m<br />6.63 x 10-35 m<br />6.65 x 10-35 m.<br />
  28. 28. Problem<br />26<br />How many gram of dibasic acid (molecular weight = 200) should be present in 100 ml of the aqueous solution to give strength 0.1 N?<br />2g<br /> 1g<br />5g<br />10g<br />
  29. 29. Problem<br />27<br />Boiling 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)<br />132.32 g/mol <br />242.32 g/mol<br />177.42 g/mol<br />79.42 g/mol<br />
  30. 30. Problem<br />28<br />The oxidation state of chromium in potassium dichromate (K2Cr2O7) is<br />+2 <br />-2<br />-5<br />+6<br />
  31. 31. Problem<br />29<br />The compound containing co-ordinate "bond is<br />SO3<br />H2SO4<br />O3<br /> All of these<br />
  32. 32. Problem<br />30<br />The correct order of reactivity of halogen is<br />F > CI > Br > I<br />F < CI < Br < I<br />F < CI > Br > I<br />F > CI < Br < I<br />
  33. 33. Problem<br />31<br />Ratio of the energy of a photon of wavelengths 3000 A and 6000 A is<br />1 : 2<br />1 : 3<br />3 : 1<br />2 : 1<br />
  34. 34. Problem<br />32<br />In the manufacture of NH3, the most favorable condition is<br />Low temperature and high pressure<br />High temperature and low pressure<br />High temperature and high pressure<br />High temperature and low pressure<br />
  35. 35. Problem<br />33<br />The molecular formula of crinoline is<br />Na3AlF6<br />Na2Al2O3<br />Fe3O4<br />All of these<br />
  36. 36. Problem<br />34<br />Calcium format, on dry heating, yields<br />Acetic acid<br />Acetaldehyde<br />Acetone <br />Formaldehyde<br />
  37. 37. Problem<br />35<br />Carnalite has which of the following composition?<br />Fe3O4<br />Na3AlF6<br />KCl-MgCl2-6H2O<br />Na2AlF5<br />
  38. 38. Problem<br />36<br />The acid formed, when iodine reacts with concentrated nitric acid, is<br />Iodic acid<br />Nitrous acid<br />Hydroiodic acid <br />Per-iodic acid<br />
  39. 39. Problem<br />37<br />Magnetic quantum number specifies<br />Size of orbitals<br />Shape of orbital<br />Nuclear stability<br />Orientation of orbitals<br />
  40. 40. Problem<br />38<br />According to Bohr's theory of hydrogen atom, which of the following is quantised for an electron?<br />Acceleration<br />Velocity<br />Angular momentum<br />Angular acceleration<br />
  41. 41. Problem<br />39<br />The 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?<br />450 K<br />100°C<br />150 K<br />327 K<br />
  42. 42. Problem<br />40<br />The number of electrons in [19K40]-1 is<br />18<br />19<br />20 <br />40<br />
  43. 43. Problem<br />41<br />Aufbau principle is obeyed in which of the following electronic configurations?<br />Is2 2s22p6<br />Is2 3p6 3s2<br />1s2 3s23p6 <br />Is2 2s2 3s2<br />
  44. 44. Problem<br />42<br />Which of the following substances is used, in laboratory, for fast drying of neutral gases?<br />Phosphorus pent oxide<br />Anhydrous calcium chloride<br />Active charcoal<br />Sodium phosphate<br />
  45. 45. Problem<br />43<br />In which of the following hydrocarbons, hydrogen is most acidic?<br />CH2 = CH2<br />CH = CH<br />CH3 - CH3<br />None of these<br />
  46. 46. Problem<br />44<br />Tyndall effect can be observed in a<br />Solvent<br />Precipitate<br />Colloidal solution<br />Solution<br />
  47. 47. Problem<br />45<br />A base, as defined by Bronzed theory, is a substance which can<br />Gain a pair of electrons<br />Accept protons<br />Lose a pair of electrons<br />Donate protons<br />
  48. 48. Problem<br />46<br />In the preparation of sulphuric acid, V205 is used in the reaction. It is<br />N2 + 3H2-> 2NH3<br />2SO2 + O2 -> 2SO3<br />SO2 + H2O ->H2SO4<br />S + O2 ->S02<br />
  49. 49. Problem<br />47<br />Empirical formula of a compound is CH2O. If its molecular weight is 180, then the molecular formula of the compound is<br />C3H6O3<br />C4H8O4<br />C6H12O<br />C5H10O5.<br />
  50. 50. Problem<br />48<br />The compound CH3 – O-C3H7 and C2H5 - O - C2H5 exhibit<br />Mesmerism <br />Chain isomerism<br />Optical isomerism <br />Cis-trans isomerism<br />
  51. 51. Problem<br />49<br />Solutions with same osmotic pressure are called<br />Isotonic<br />Hypertonic<br />Normal<br />None of these<br />
  52. 52. Problem<br />50<br />pH value of a solution, whose hydronium ion concentration is 6.2 x 10-9 mol/1 is<br />7.75<br />7.21<br />8.21<br />6.21<br />
  53. 53. For solution visit www.vasista.net<br />

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