AFMC Chemistry 2001


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AFMC Chemistry 2001

  1. 1. AFMC–Past papers<br />CHEMISTRY - UNSOLVED PAPER - 2001<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. .<br />01<br />Problem<br />Which of these is a polyamide?<br />Nylon<br />Rayon<br />Orson<br />None of these<br />
  4. 4. Problem<br />.<br />02<br />Para and Roth hydrogen differ in<br />Atomic number<br />Atomic mass<br />Spins of proton<br />Number of neutron<br />
  5. 5. Problem<br />.<br />03<br />In long form of the periodic table, properties of elements are functions of their<br />Atomic mass <br />Atomic number<br />Number of neutrons<br />None of these<br />
  6. 6. Problem<br />.<br />04<br />A mixture of NO2 and N2O4 has a vapour density of 38.3 at 300 K. What is the number of moles of NO2 in 100 g of the mixture?<br />0.44 <br />4.4<br />3.4 <br />3.86<br />
  7. 7. Problem<br />.<br />05<br />Threshold energy is equal to<br />Activation energy<br />Activation energy - energy of molecules<br />Activation energy + energy of molecules<br />None of these<br />
  8. 8. Problem<br />06<br />In which of the following, entropy is increasing?<br />Crystallization of sugar from sugar solution<br />N2 (g) + 3H2(g) ->2NH3<br />H2 + I2 ->2HI<br />Adding naphthalene to benzene<br />
  9. 9. Problem<br />07<br /> Adding HCHO to NH3 gives<br />Formic acid<br />HexaMethylenetetramine<br />Methylamide<br />None of these<br />
  10. 10. Problem<br />08<br />A solution of HC1 of pH = 6 is diluted 100 times, then<br />It becomes more acidic<br />It becomes neutral<br />It becomes basic<br />Its pH does not change.<br />
  11. 11. Problem<br />09<br />NH3 is added to BF3 by<br />Ionic bond <br />Covalent bond<br />Dative bond<br />Molecular bond<br />
  12. 12. Problem<br />10<br />Ethanol and diethyl ether have same empirical formula but ethanol has higher boiling point due to<br />Ionic bond <br />Acidic bond<br />Hydrogen bond<br />Covalent bond<br />
  13. 13. Problem<br />11<br />Two chemicals having same chemical formula but different arrangement of atoms are called<br />Isotopes <br />Isomers<br />Polymers<br />Espiers<br />
  14. 14. Problem<br />12<br />10% of a substance decays in 5 seconds. The approximate amount left after 25 seconds is<br />10% <br />40%<br />60% <br />75%<br />
  15. 15. Problem<br />13<br />Which of these will give green flame colour ?<br />ZnCl2<br />NaCl<br />BaCl2<br />CaCl2<br />
  16. 16. Problem<br />14<br />When a lead battery discharges, which of these occurs?<br />Pb is formed<br />Sulphuric acid is consumed<br />PbSO4 ->Pb+H2 SO4<br />PbSO4 + H2 ->Pb + H2SO4<br />
  17. 17. Problem<br />15<br />High ionization energy indicates that<br />Atom size is large<br />Atom size is small<br />Atom is metallic<br />Valence electrons are held tightly by the atom<br />
  18. 18. Problem<br />16<br />Half-life of a sample is 160 days. After 800 days, 1 gm of the sample will be reduced to<br />1/2 gm <br />1/5 gm<br />1/4 gm <br />1/32 gm<br />
  19. 19. Problem<br />17<br />Organic catalysts differ from inorganic catalysts in<br />Acting at a very high temperature<br />Being proteins<br />Being consumed in the reaction<br />Acting at very low temperature<br />
  20. 20. Problem<br />18<br />Which of these is a hypnotic?<br />Metaldehyde<br />Acetaldehyde<br />Paraldehyde<br />None of these<br />
  21. 21. Problem<br />19<br />Moderator used in nuclear reactors is<br />Cadmium <br />Heavy water<br />Boron<br />Geranium<br />
  22. 22. Problem<br />20<br />Heavy water is obtained by<br />Boiling water<br />Fractional distillation of H2O<br />Prolonged electrolysis of H2O<br />Heating H2O2<br />
  23. 23. Problem<br />21<br />Roasting is done in<br />Blast furnace<br />Reverberatory furnace<br />Electric furnace<br />Refractory furnace<br />
  24. 24. Problem<br />22<br />When light is incident on a colloidal solution<br />It is absorbed partially<br />It is absorbed completely<br />It is scattered<br />It passes undeviated<br />
  25. 25. Problem<br />23<br />Rutherford's experiment proved for the first time the existence of<br />Neutron <br />Nucleus<br />Proton <br />Electron<br />
  26. 26. Problem<br />24<br />A reaction is given as 2P + Q —> products. If concentration of O is kept constant and concentration of P is doubled then rate of Reaction is<br />Doubled<br />Halved<br />Quadrupled <br />Remains same<br />
  27. 27. Problem<br />25<br />If two solutions have same osmotic pressure then they are called<br />Isotonic <br />Hypotonic<br />Hypertonic <br />None of these<br />
  28. 28. Problem<br />26<br />If H2SO4 is added to water, then the solution<br />Shows positive deviation from Raoult's law<br />Shows negative deviation<br />Shows ideal solution properties<br />Is not stable<br />
  29. 29. Problem<br />27<br />Aluminum is refined by<br />Baeyer's process<br />Hall's process<br />Hoope's process<br />Serpeck's process<br />
  30. 30. Problem<br />28<br />In DNA the nitrogenous bases are attached to each other by<br />Ionic bond<br />Hydrogen bond<br />Covalent bond<br />Van der Waal's forces<br />
  31. 31. Problem<br />29<br />This radical can be identified by Borax Bead test<br />Mg2+<br />Ca2+<br />Cu+<br />Cu2+<br />
  32. 32. Problem<br />30<br />Pressure is measured by<br />Barometer<br />Anemometer<br />Hygrometer <br />Voltameter<br />
  33. 33. Problem<br />31<br />Bond angle in H2O2 is<br />97°<br />91°<br />94.8°<br />99.8°<br />
  34. 34. Problem<br />32<br />The bond formed due to sidewise overlapping of p-orbitals is<br />π-bond <br />-bond<br /> π and bond<br />Sometimes π and sometimes bond<br />
  35. 35. Problem<br />33<br />The brass utensils are tinned to prevent<br />Corrosion <br />Attack of acids<br />Breakage <br />None of these<br />
  36. 36. Problem<br />34<br />The two ice cubes kept pressed against each other, stick to each other due to<br />Intermolecular forces<br />Hydrogen bonding<br />Van der Waal's forces<br />None of these<br />
  37. 37. Problem<br />35<br />The potential of a H2 electrode which is dipped in a solution of pH = 10 is<br />Zero<br />1 V<br />2 V <br />0.592 V<br />
  38. 38. Problem<br />36<br />Find the potential of a Cu2+ electrode which is dipped in a solution of pH = 5.<br />0.29 V <br />0.529 V<br />5.29 V<br />0.63 V<br />
  39. 39. Problem<br />37<br />According to Avogadro, "under similar conditions of temperature and pressure, equal volumes of all gases contain equal number of “<br />Electrons <br />Molecules<br />Atoms<br />Ions<br />
  40. 40. Problem<br />38<br />Sodium thiosulphate is added in photography to<br />Improve colour of photograph<br />Remove unreactedAgBr<br />Form latent image<br />To form a better picture<br />
  41. 41. Problem<br />39<br />Ionic bond formation between A and B can take place only if<br />Ionisation energy of A is less and electron affinity of B is more<br />If ionisation energy of both A and B is more<br />Both have equal electron affinities<br />None of these<br />
  42. 42. Problem<br />40<br />Metallic crystalline solids have<br />Low melting point and boiling point<br />Are bad conductors<br />Are good conductors of heat and electricity<br />Only conduct heat<br />
  43. 43. Problem<br />41<br />If 1 litre of N2 is mixed with 2 litres of O2 , quantity explaining it is<br />Kinetic energy<br />Partial pressure<br />Rate of diffusion<br />None of these<br />
  44. 44. Problem<br />42<br />CH3OH is more polar than corresponding ether<br />Covalent bond <br />H-bond<br />Van der Waal<br />None of these<br />
  45. 45. Problem<br />43<br />Which is more basic?<br />Benzylamine<br />Aniline<br />Acetamide<br />None of these<br />
  46. 46. Problem<br />44<br />Cellulose is a<br />Hexapolysaccharide<br />Pentapolysaccharide<br />Tripolysaccharide<br />None of these<br />
  47. 47. Problem<br />45<br />Molten NaCI results in conduction because of<br />Free electrons<br />Ions<br />Molecules <br />Anions<br />
  48. 48. Problem<br />46<br />Emulsifier helps in<br />Stabilising the emulsion<br />Destabilising the emulsion<br />Forming the emulsion<br />Breaking the emulsion<br />
  49. 49. Problem<br />47<br />Which of the following is not true about vitamins?<br />They were named by Funk.<br />They are vital for life.<br />Their deficiency causes diseases.<br />They help in digestion<br />
  50. 50. Problem<br />48<br />Alcohol that is used in a beverage is<br />Propanol<br />Butanol<br />Ethanol <br />Methanol<br />
  51. 51. Problem<br />49<br />At 25°C the pH value of a solution is 6, then the solution is<br />Acidic<br />Neutral<br />Basic<br />Alkaline<br />
  52. 52. Problem<br />50<br />The temperature above which a gas cannot be liquefied is called as<br />Inversion temperature<br />Critical temperature<br />Neutral temperature<br />Curie point<br />
  53. 53. For solution visit<br />