AFMC–Past papers<br />CHEMISTRY - UNSOLVED PAPER - 1998<br />
SECTION – I (Total Marks :50)<br />Single Correct Answer Type<br />There are five parts in this question. Four choices are...
01<br />Problem<br />When enthalpy and entropy change for a chemical reaction are -2.5 x 103 cals and 7.4 cals deg-1 respe...
Problem<br />02<br />Nitrogen can be obtained from air by removing<br />Carbon dioxide<br />Hydrogen<br />Oxygen<br />Both...
Problem<br />03<br />Which of the following metal is present in brass, bronze and German silver?<br />Cu<br />Mg<br />Zn<b...
Problem<br />04<br />Benzaldehyde reacts with ammonia to form<br />Hydro benzamide<br />Benzamide<br />Aniline<br />Phenyl...
Problem<br />05<br />Which of the following has zero dipole moment?<br />NH4<br />CH4<br />PH3<br />CH2C12<br />
Problem<br />06<br />The pH value of 10-8 M HC1 is<br />More than 7<br />Less than 7<br />Equal to 7<br />Either (a) or (c...
Problem<br />07<br />The number of electrons shared by each outermost shell of N2 is<br />4<br />3<br />2<br />5<br />
Problem<br />08<br />For making Ag from AgN03, which of the following is the correct statement?<br />With Na2C03<br />With...
Problem<br />09<br />Night blindness is caused by the deficiency of<br />Vitamin-C<br />Vitamin-A<br />Vitamin-B12<br />Vi...
Problem<br />10<br />Which of the following will not displace hydrogen?<br />Hg<br />Pb<br />Ba<br />Sn<br />
Problem<br />11<br />If the volume of 2 moles of an ideal gas at 540 K is 44.8 litre, then its pressure will be<br />3 atm...
Problem<br />12<br />Anhydrous A1C13 is prepared from<br />Dry HC1 gas + heated aluminium metal<br />Aluminium and Cl2<br ...
Problem<br />13<br /> Chloroform on treatment, with concentrated HN03, gives<br />CC13N02<br />CHC1HN03<br />CHC12N02<br /...
Problem<br />14<br />Both methane and ethane can be prepared, in one step, by the reaction of<br />CH3Br<br />CH3OH<br />C...
Problem<br />15<br />The freezing point of a solution, prepared from 1.25 gm of a non-electrolyte and 20 gm of water, is 2...
Problem<br />16<br />1-Chlorobutane, on reaction with alcoholic potash (KOH), gives<br />2-Butene<br />1-Butanol<br />1-Bu...
Problem<br />17<br />If acetyl chloride is reduced in the presence of BaS04 and Pd, then<br />CH3COOH is formed<br />CH3CH...
Problem<br />18<br />Lyophilic colloids are stable due to<br />Small size of the particle<br />Large size of particle<br /...
Problem<br />19<br />The correct order of acidic strength is<br />HBr < HC1 < HI < HF<br />HC1 < HBr < HF < HI<br />HF < H...
Problem<br />20<br />Which of the following is a calomel?<br />Hg2Cl2<br />HgBr2<br />HgCl2<br />HgS04<br />
Problem<br />21<br />The hybridization of carbon in diamond, graphite and acetylene is in the order of<br />sp sp2 sp3<br ...
Problem<br />22<br />The oxidation of toluene to benzaldehyde by chromyl chloride is called<br />Fittig reaction<br />Etar...
Problem<br />23<br />Example of unit cell with crystallographic dimensions a≠b≠c, α=γ= 90°,β ≠90° is<br />Rhombic sulphur<...
Problem<br />24<br />Nitroso amines (R2N—N = O) are insoluble in water. On heating them with conc. H2S04, they give second...
Problem<br />25<br />In the equation 4M + 8CN- + 2H2O + 02 -> 4[M(CN)2]- + 4011 Identify the metal M<br />Gold<br />Iron<b...
Problem<br />26<br />Ozone is prepared by passing silent electric discharge through oxygen. In this reaction<br />Oxygen i...
Problem<br />27<br />Galaxies is converted into glucose in<br />Liver<br />Stomach<br />Mouth<br />An intestine<br />
Problem<br />28<br />The lusture of a metal is due to<br />Its chemical inertness<br />Its high polishing<br />Its high de...
Problem<br />29<br />When cold potassium permanganate (KMnO4) is added to ethylene gives<br />Methanol<br />Ethanol<br />G...
Problem<br />30<br />One mole of C02 contains<br />6.023 x 1023 atoms of oxygen<br />18.1 x 1023 molecules of CO2<br />3 g...
Problem<br />31<br />A sudden large jump between the values of second  and third ionization energies of an element wou!: b...
Problem<br />32<br />Chlorine is liberated, when we heat<br />Pb(N03)2 + MnO2,<br />K2Cr2O7 + MnO2<br />KMnO4 + NaCI<br />...
Problem<br />33<br />Oxalic acid, when heated with concentrated H2SO4 gives<br />H2O2 and CO2<br />CO and CO2<br />H2O and...
Problem<br />34<br />Which of the following compounds do not belong to lipids?<br />Phospho-lipids<br />Amino acids<br />F...
Problem<br />35<br />A compound is treated with NaNH2 , to give sodium salt. Identify the compound<br />C2H6<br />C6H6<br ...
Problem<br />36<br />Aspirin is obtained by the reaction of salicylic acid with<br />Acetic acid<br />Acetaldehyde<br />Ac...
Problem<br />37<br />In the Liebermann's nitro so reaction, sequential changes in the colour of phenol occurs as<br />Red ...
Problem<br />38<br />Which of the following is obtained when N2 reacts with calcium carbide?<br />Calcium cyan amide<br />...
Problem<br />39<br />Identify Z in the reaction<br /> BrCH2CH2CN<br />NCCH2CH2CN<br />CH3CH2CN<br />BrCH = CHCN<br />
Problem<br />40<br />If 5.85 grams of NaC2  (molecular weight = 58.5) is dissolved in 90 grams of water, the mole fraction...
Problem<br />41<br />If 90Th228 disintegrates to 83Bi212, then the number of α and β particles emitted is<br />4 α only<br...
Problem<br />42<br />The reaction N2O5 in CC14(solution) -> 2NO2(solution) + l/2O2(g) is of first order in N2O5 with rate ...
Problem<br />43<br />The polymer, which has amide linkage, is<br />Teflon<br />Ethylene<br />Nylon-66<br />Bakelite<br />
Problem<br />44<br />Which one of the following is the strongest acid?<br />CH3COOH<br />CBr3COOH<br />CF3COOH<br />CC13CO...
Problem<br />45<br />The correct order of the increasing ionic character is<br />BeC12 < BaC12 < MgC12 < CaC12<br />BeC12 ...
Problem<br />46<br />The reaction of aromatic acyl chloride and phenol in the presence of a base NaOH or pyridine is calle...
Problem<br />47<br />If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.14...
Problem<br />48<br />An organic compound (a) reacts with sodium metal and forms (b). on heating with conc. H2SO4, (a) give...
Problem<br />49<br />The uncertainty in the momentum of an electron is 1.0*x 10-5 kg m.s.-1 The uncertainty in its positio...
Problem<br />50<br />A biological catalyst is essentially<br />A carbohydrate<br />An enzyme<br />An amino acid<br />A nit...
For solution visit www.vasista.net<br />
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AFMC Chemistry 1998

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AFMC Chemistry 1998

  1. 1. AFMC–Past papers<br />CHEMISTRY - UNSOLVED PAPER - 1998<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 />When enthalpy and entropy change for a chemical reaction are -2.5 x 103 cals and 7.4 cals deg-1 respectively predict the reaction at 298 K is<br />Irreversible<br />Reversible<br />Spontaneous<br />Non-spontaneous<br />
  4. 4. Problem<br />02<br />Nitrogen can be obtained from air by removing<br />Carbon dioxide<br />Hydrogen<br />Oxygen<br />Both (a) and (c)<br />
  5. 5. Problem<br />03<br />Which of the following metal is present in brass, bronze and German silver?<br />Cu<br />Mg<br />Zn<br />A1<br />
  6. 6. Problem<br />04<br />Benzaldehyde reacts with ammonia to form<br />Hydro benzamide<br />Benzamide<br />Aniline<br />Phenyl cyanide<br />
  7. 7. Problem<br />05<br />Which of the following has zero dipole moment?<br />NH4<br />CH4<br />PH3<br />CH2C12<br />
  8. 8. Problem<br />06<br />The pH value of 10-8 M HC1 is<br />More than 7<br />Less than 7<br />Equal to 7<br />Either (a) or (c)<br />
  9. 9. Problem<br />07<br />The number of electrons shared by each outermost shell of N2 is<br />4<br />3<br />2<br />5<br />
  10. 10. Problem<br />08<br />For making Ag from AgN03, which of the following is the correct statement?<br />With Na2C03<br />With AsH3<br />With PH3<br />With NH3<br />
  11. 11. Problem<br />09<br />Night blindness is caused by the deficiency of<br />Vitamin-C<br />Vitamin-A<br />Vitamin-B12<br />Vitamin-E<br />
  12. 12. Problem<br />10<br />Which of the following will not displace hydrogen?<br />Hg<br />Pb<br />Ba<br />Sn<br />
  13. 13. Problem<br />11<br />If the volume of 2 moles of an ideal gas at 540 K is 44.8 litre, then its pressure will be<br />3 atmosphere<br />2 atmosphere<br />1 atmosphere<br />4 atmosphere<br />
  14. 14. Problem<br />12<br />Anhydrous A1C13 is prepared from<br />Dry HC1 gas + heated aluminium metal<br />Aluminium and Cl2<br />Conc. HC1 and aluminium metal<br />Dilute HC1 and aluminium metal<br />
  15. 15. Problem<br />13<br /> Chloroform on treatment, with concentrated HN03, gives<br />CC13N02<br />CHC1HN03<br />CHC12N02<br />CHC12N03<br />
  16. 16. Problem<br />14<br />Both methane and ethane can be prepared, in one step, by the reaction of<br />CH3Br<br />CH3OH<br />C2H4<br />CH3CH2OH<br />
  17. 17. Problem<br />15<br />The freezing point of a solution, prepared from 1.25 gm of a non-electrolyte and 20 gm of water, is 271.9 K. If molar depression constant is 1.86 K mole-1, then molar mass of the solute will be<br />115.3<br />106.7<br />105.7<br />93.9<br />
  18. 18. Problem<br />16<br />1-Chlorobutane, on reaction with alcoholic potash (KOH), gives<br />2-Butene<br />1-Butanol<br />1-Butene<br />2-Butanol<br />
  19. 19. Problem<br />17<br />If acetyl chloride is reduced in the presence of BaS04 and Pd, then<br />CH3COOH is formed<br />CH3CH2OH is formed<br />CH3CHO is formed<br />CH3COCH3 is formed<br />
  20. 20. Problem<br />18<br />Lyophilic colloids are stable due to<br />Small size of the particle<br />Large size of particle<br />Charge on the particle<br />Layer of dispersion medium on the particles<br />
  21. 21. Problem<br />19<br />The correct order of acidic strength is<br />HBr < HC1 < HI < HF<br />HC1 < HBr < HF < HI<br />HF < HC1 < HBr < HI<br />HI < HBr < HC1 < HF<br />
  22. 22. Problem<br />20<br />Which of the following is a calomel?<br />Hg2Cl2<br />HgBr2<br />HgCl2<br />HgS04<br />
  23. 23. Problem<br />21<br />The hybridization of carbon in diamond, graphite and acetylene is in the order of<br />sp sp2 sp3<br />sp3 sp2 sp<br />sp3 sp sp2<br />sp2 sp3sp<br />
  24. 24. Problem<br />22<br />The oxidation of toluene to benzaldehyde by chromyl chloride is called<br />Fittig reaction<br />Etard reaction<br />Wurtz reaction<br />Rosenmund reaction<br />
  25. 25. Problem<br />23<br />Example of unit cell with crystallographic dimensions a≠b≠c, α=γ= 90°,β ≠90° is<br />Rhombic sulphur<br />Graphite<br />Calcite<br />Monoclinic sulphur<br />
  26. 26. Problem<br />24<br />Nitroso amines (R2N—N = O) are insoluble in water. On heating them with conc. H2S04, they give secondary amines. This reaction is called<br /> <br /> <br />Liebermann nitroso reaction<br />Fries reaction<br />Perkin reaction<br />Etard reaction<br />
  27. 27. Problem<br />25<br />In the equation 4M + 8CN- + 2H2O + 02 -> 4[M(CN)2]- + 4011 Identify the metal M<br />Gold<br />Iron<br />Copper<br />Zinc<br />
  28. 28. Problem<br />26<br />Ozone is prepared by passing silent electric discharge through oxygen. In this reaction<br />Oxygen is loaded with energy<br />Energy is absorbed<br />Energy is given out<br />Oxygen is dissociated into atoms<br />
  29. 29. Problem<br />27<br />Galaxies is converted into glucose in<br />Liver<br />Stomach<br />Mouth<br />An intestine<br />
  30. 30. Problem<br />28<br />The lusture of a metal is due to<br />Its chemical inertness<br />Its high polishing<br />Its high density<br />Presence of free electrons<br />
  31. 31. Problem<br />29<br />When cold potassium permanganate (KMnO4) is added to ethylene gives<br />Methanol<br />Ethanol<br />Glycerol<br />Ethylene glycol<br />
  32. 32. Problem<br />30<br />One mole of C02 contains<br />6.023 x 1023 atoms of oxygen<br />18.1 x 1023 molecules of CO2<br />3 grams atoms of C02<br />6.023 x 1023 molecules of CO2<br />
  33. 33. Problem<br />31<br />A sudden large jump between the values of second and third ionization energies of an element wou!: be associated with which of the following electronic configuration?<br />1s2, 1s2 2p6, 3s1, 3p2<br />1s2, 2s22p6, 3s23p1<br />1s2, 2s2 2p6 , 3s1<br />1s2, 2s2 2p6, 3s2<br />
  34. 34. Problem<br />32<br />Chlorine is liberated, when we heat<br />Pb(N03)2 + MnO2,<br />K2Cr2O7 + MnO2<br />KMnO4 + NaCI<br />K2Cr2O7 + HC1<br />
  35. 35. Problem<br />33<br />Oxalic acid, when heated with concentrated H2SO4 gives<br />H2O2 and CO2<br />CO and CO2<br />H2O and CO2<br />CO2 and H2S<br />
  36. 36. Problem<br />34<br />Which of the following compounds do not belong to lipids?<br />Phospho-lipids<br />Amino acids<br />Fats<br />Carbohydrates<br />
  37. 37. Problem<br />35<br />A compound is treated with NaNH2 , to give sodium salt. Identify the compound<br />C2H6<br />C6H6<br />C2H2<br />C2H4<br />
  38. 38. Problem<br />36<br />Aspirin is obtained by the reaction of salicylic acid with<br />Acetic acid<br />Acetaldehyde<br />Acetone<br />Acetic anhydride<br />
  39. 39. Problem<br />37<br />In the Liebermann's nitro so reaction, sequential changes in the colour of phenol occurs as<br />Red -> green ->white<br />Red-> deep blue -> green<br />Brown or red-> green red -> deep blue<br />White -> red green<br />
  40. 40. Problem<br />38<br />Which of the following is obtained when N2 reacts with calcium carbide?<br />Calcium cyan amide<br />Calcium acetate<br />Calcium cyan ate<br />Calcium carbonate<br />
  41. 41. Problem<br />39<br />Identify Z in the reaction<br /> BrCH2CH2CN<br />NCCH2CH2CN<br />CH3CH2CN<br />BrCH = CHCN<br />
  42. 42. Problem<br />40<br />If 5.85 grams of NaC2 (molecular weight = 58.5) is dissolved in 90 grams of water, the mole fraction of NaC1 will be<br />0.0196<br />0.1<br />0.01<br />0.2<br />
  43. 43. Problem<br />41<br />If 90Th228 disintegrates to 83Bi212, then the number of α and β particles emitted is<br />4 α only<br />4 α and 1β<br />4 α and 7β<br />7β only<br />
  44. 44. Problem<br />42<br />The reaction N2O5 in CC14(solution) -> 2NO2(solution) + l/2O2(g) is of first order in N2O5 with rate constant 6.2 x 10-4s-1. What is the value of rate of reaction when [N2O5] = 1.25 mole L-1?<br />5.15 x 10-5 mole L-1S-1<br />6.35 x 10-3 mole L-1S-1<br />7.75 x 10-4 mole L-1S-1<br />3.85 x 10-4 mole L-1S-1 <br />
  45. 45. Problem<br />43<br />The polymer, which has amide linkage, is<br />Teflon<br />Ethylene<br />Nylon-66<br />Bakelite<br />
  46. 46. Problem<br />44<br />Which one of the following is the strongest acid?<br />CH3COOH<br />CBr3COOH<br />CF3COOH<br />CC13COOH<br />
  47. 47. Problem<br />45<br />The correct order of the increasing ionic character is<br />BeC12 < BaC12 < MgC12 < CaC12<br />BeC12 < MgC12 < BaC12 < CaC12<br />BeC12 < MgC12 < CaC12 < BaC12<br />BaC12 < CaC12 < MgC12 < BeC12<br />
  48. 48. Problem<br />46<br />The reaction of aromatic acyl chloride and phenol in the presence of a base NaOH or pyridine is called<br />Sandmayer's reaction<br />Perkin's reaction<br />Kolbe's reaction<br />Schotten Baumann reaction<br />
  49. 49. Problem<br />47<br />If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water, what will be the content of oxygen in substance?<br />83.23%<br />78.45%<br />73.29%<br />89.50%<br />
  50. 50. Problem<br />48<br />An organic compound (a) reacts with sodium metal and forms (b). on heating with conc. H2SO4, (a) gives diethyl ether. (a) and (b) are<br />CH3OH and CH3ONa<br />C3H7OH and CH3ONa<br />C2H5OH and C2H5ONa<br />C4H9OH and C4H9ONa<br />
  51. 51. Problem<br />49<br />The uncertainty in the momentum of an electron is 1.0*x 10-5 kg m.s.-1 The uncertainty in its position will be (h = 6.62 * 10-34 kg. m2.s-10)<br />5.27 * 10-30 m<br />1.05 x 10-26 m<br />1.05 x 10-28 m<br />5.25 x 10-28 m<br />
  52. 52. Problem<br />50<br />A biological catalyst is essentially<br />A carbohydrate<br />An enzyme<br />An amino acid<br />A nitrogen molecule<br />
  53. 53. For solution visit www.vasista.net<br />

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