AIEEE –Past papers<br />CHEMISTRY- UNSOLVED PAPER - 2005<br />
SECTION – I<br />Single Correct Answer Type<br />This Section contains 75multiple choice questions. Each question has four...
01<br />Problem<br />Which of the following oxides is amphoteric in character?<br />CaO<br />CO2<br />SiO2 <br />SnO2<br />
Problem<br />02<br />Which one of the following species is diamagnetic in nature?<br />He<br /> H2<br />H<br />H<br />
Problem<br />03<br />If α is the degree of dissociation of Na2SO4, the vant Hoff’s factor (i) used for<br />calculating th...
Problem<br />04<br />The oxidation state of Cr in [Cr(NH3)4Cl2]+ is<br />+3 <br />+2<br />+1 <br />0<br />
Problem<br />05<br />Hydrogen bomb is based on the principle of<br />Nuclear fission <br />Natural radioactivity<br />Nucl...
Problem<br />06<br />An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the cen...
Problem<br />07<br />For a spontaneous reaction the ΔG, equilibrium constant (K) and o<br />E0cell will be respectively<br...
08<br />Problem<br />Which of the following is a polyamide?<br />Teflon <br />Nylon – 66<br />Terylene<br />Bakelite<br />
Problem<br />09<br />Which one of the following types of drugs reduces fever?<br />Analgesic<br />Antipyretic<br />Antibio...
Problem<br />10<br />Due to the presence of an unpaired electron, free radicals are:<br />Chemically reactive <br />Chemic...
Problem<br />11<br />Lattice energy of an ionic compounds depends upon<br />Charge on the ion only<br />Size of the ion on...
12<br />Problem<br />The highest electrical conductivity of the following aqueous solutions is of<br />0.1 M acetic acid<b...
Problem<br />13<br />Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic  mass = 27 amu; 1 Fa...
Problem<br />14<br />Consider an endothermic reaction, X->Y with the activation energies Eb and Ef<br />for the backward a...
Problem<br />15<br />Consider the reaction:  N 2 + 3H 2 ->2NH3 carried out at constant temperature and pressure. If ΔH and...
Problem<br />16<br />Which one of the following statements is NOT true about the effect of an increase in temperature on t...
17<br />Problem<br />The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solut...
Problem<br />18<br />The solubility product of a salt having general formula MX2, in water is: 4 ×10−12. The concentration...
Problem<br />19<br />Benzene and toluene form nearly ideal solutions. At 20oC, the vapour pressure of benzene is 75 torr a...
Problem<br />20<br />The exothermic formation of ClF3 is represented by the equation:<br />Which of the following will inc...
Problem<br />21<br />Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M fir...
Problem<br />22<br />For the reaction<br />(Kc = 1.8 ×10−6 at 184o C)<br />(R = 0.0831 kJ / (mol.K)<br />When Kp and Kcare...
Problem<br />23<br />Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be<br />3.98 ×108<br />3.88 ×106...
Problem<br />24<br />A reaction involving two different reactants can never be<br />Unimolecular reaction<br />First order...
Problem<br />25<br />If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass ...
Problem<br />26<br />In a multi – electron atom, which of the following orbitals described by the three<br />quantum numbe...
Problem<br />27<br />During the process of electrolytic refining of copper, some metals present as impurity settle as ‘ano...
Problem<br />28<br />Calculate                      Using appropriate molar conductances of the electrolytes listed above ...
Problem<br />29<br />A schematic plot of In Keqversus inverse of temperature for a reaction is shown<br />Below <br />The ...
Problem<br />30<br />The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively ...
Problem<br />31<br />Based on lattice energy and other considerations which one of the following alkali metal chlorides is...
Problem<br />32<br />Heating mixture of Cu2O and Cu2S will give<br />Cu + SO2<br />Cu + SO3<br />CuO + CuS <br />Cu2SO3<br />
Problem<br />33<br />The molecular shapes of SFF4 , CFF4  and XeF4 are<br />the same with 2,0 and 1 lone pairs of electron...
Problem<br />34<br />The number and type of bonds between two carbon atoms in calcium carbide are<br />One sigma, one pi<b...
Problem<br />35<br />The oxidation state of chromium in the final product formed by the reaction between KI and acidified ...
Problem<br />36<br />The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous  acid is<br />zero <br ...
Problem<br />37<br />What is the conjugate base of OH-?<br />O2<br />H2O<br />O-<br />O-2<br />
Problem<br />38<br />The correct order of the thermal stability of hydrogen halides (H – X) is<br />HI > HBr > HCl > HF <b...
Problem<br />39<br />Heating an aqueous solution of aluminium chloride to dryness will give<br />AlCl3<br />Al2Cl6<br /> A...
Problem<br />40<br />Calomel (Hg2Cl2) on reaction with ammonium hydroxide gives<br />HgNH2Cl <br />NH2 – Hg – Hg – Cl<br /...
Problem<br />41<br />In which of the following arrangements the order is NOT according to the property indicated against i...
Problem<br />42<br />In silicon dioxide<br />Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is ...
Problem<br />43<br />Of the following sets which one does NOT contain isoelectronic species?<br />PO-34 ,SO-24 ,ClO-4<br /...
Problem<br />44<br />The lanthanide contraction is responsible for the fact that<br />Zr and Y have about the same radius ...
Problem<br />45<br />The IUPAC name of the coordination compound K3[Fe(CN)6] is<br />Potassium hexacyanoferrate (II) <br /...
Problem<br />46<br />Which of the following compounds shows optical isomerism?<br />[Cu(NH3)4]+2 <br />[ZnCl4]-2<br />[Cr(...
Problem<br />47<br />Which one of the following cyano complexes would exhibit the lowest value of<br />paramagnetic behavi...
Problem<br />48<br />2 methylbutane on reacting with bromine in the presence of sunlight gives mainly<br />1 – bromo -2 - ...
Problem<br />49<br />The photon of hard gamma radiation knocks a proton out of       Mg nucleus to form<br />the isotope o...
Problem<br />50<br />The best reagent to convert pent -3- en-2-ol into pent -3-en-2-one is<br />Acidic permanganate <br />...
Problem<br />51<br />Tertiary alkyl halides are practically inert to substitution by SN 2 mechanism because of<br />Insolu...
Problem<br />52<br />In both DNA and RNA, heterocyclic base and phosphate ester linkages are at-<br />C    and C    respec...
Problem<br />53<br />Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 400C gives Predominantly<br />3...
Problem<br />54<br />Among the following acids which has the lowest pKa value?<br />CH3COOH<br />HCOOH<br />(CH3)2COOH<br ...
Problem<br />55<br />The decreasing order of nucleophilicity among the nucleophiles<br />,<br />CH3O-<br />CN-<br />,<br /...
Problem<br />56<br />Which one of the following methods is neither meant for the synthesis nor for<br />separation of amin...
Problem<br />57<br />Which of the following is fully fluorinated polymer?<br />Neoprene <br />Teflon<br />Thiokol <br />PV...
Problem<br />58<br />Of the five isomeric hexanes, the isomer which can give two monochlorinated<br />compounds is<br /> n...
Problem<br />59<br />Alkyl halides react with dialkyl copper reagents to give<br />alkenes <br />alkyl copper halides<br /...
Problem<br />60<br />Acid catalyzed hydration of alkenes except ethene leads to the formation of<br />primary alcohol<br /...
Problem<br />61<br />Amongst the following the most basic compound is<br />Benzylamine<br />aniline<br />acetanilide <br /...
Problem<br />62<br />Which types of isomerism is shown by 2,3-dichlorobutane?<br />Diastereo<br />Optical<br />Geometric <...
Problem<br />63<br />The reaction<br />is fastest when X is<br />Cl<br />NH2<br />OC2H5<br />OCOR<br />
Problem<br />64<br />Elimination of bromine from 2-bromobutane results in the formation of-<br />equimolar mixture of 1 an...
Problem<br />65<br />Equimolar solutions in the same solvent have<br />Same boiling point but different freezing point<br ...
Problem<br />66<br />Which of the following statements in relation to the hydrogen atom is correct?<br />3s orbital is low...
Problem<br />67<br />The structure of diborane (B2H6) contains<br />four 2c-2e bonds and two 3c-2e bonds<br />two 2c-2e bo...
Problem<br />68<br />The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The ...
Problem<br />69<br />Which of the following factors may be regarded as the main cause of lanthanide<br />contraction?<br /...
Problem<br />70<br />Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a c...
Problem<br />71<br />p-cresol reacts with chloroform in alkaline medium to give the compound A which<br />adds hydrogen cy...
Problem<br />72<br />An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% wh...
Problem<br />73<br />If the bond dissociation energies of XY, X2 and Y2 (all diatomic molecules) are in the ratio of 1:1:0...
Problem<br />74<br />t1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial...
Problem<br />75<br />An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature...
FOR SOLUTION VISIT  WWW.VASISTA.NET<br />
Upcoming SlideShare
Loading in …5
×

AieeeChemistry 2005

1,046 views

Published on

Published in: Education, Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,046
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
  • .
  • r
  • AieeeChemistry 2005

    1. 1. AIEEE –Past papers<br />CHEMISTRY- UNSOLVED PAPER - 2005<br />
    2. 2. SECTION – I<br />Single Correct Answer Type<br />This Section contains 75multiple choice questions. Each question has four choices A), B), C) and D) out of which ONLY ONE is correct.<br />
    3. 3. 01<br />Problem<br />Which of the following oxides is amphoteric in character?<br />CaO<br />CO2<br />SiO2 <br />SnO2<br />
    4. 4. Problem<br />02<br />Which one of the following species is diamagnetic in nature?<br />He<br /> H2<br />H<br />H<br />
    5. 5. Problem<br />03<br />If α is the degree of dissociation of Na2SO4, the vant Hoff’s factor (i) used for<br />calculating the molecular mass is<br />1 + α<br />1 - α<br />1 + 2 α <br />1 – 2 α<br />
    6. 6. Problem<br />04<br />The oxidation state of Cr in [Cr(NH3)4Cl2]+ is<br />+3 <br />+2<br />+1 <br />0<br />
    7. 7. Problem<br />05<br />Hydrogen bomb is based on the principle of<br />Nuclear fission <br />Natural radioactivity<br />Nuclear fusion<br /> Artificial radioactivity<br />
    8. 8. Problem<br />06<br />An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be<br />AB <br />A2B<br /> AB3<br />A3B<br />
    9. 9. Problem<br />07<br />For a spontaneous reaction the ΔG, equilibrium constant (K) and o<br />E0cell will be respectively<br />-ve, >1, +ve <br />+ve, >1, -ve<br />-ve, <1, -ve<br />-ve, >1, -ve<br />
    10. 10. 08<br />Problem<br />Which of the following is a polyamide?<br />Teflon <br />Nylon – 66<br />Terylene<br />Bakelite<br />
    11. 11. Problem<br />09<br />Which one of the following types of drugs reduces fever?<br />Analgesic<br />Antipyretic<br />Antibiotic <br />Tranquiliser<br />
    12. 12. Problem<br />10<br />Due to the presence of an unpaired electron, free radicals are:<br />Chemically reactive <br />Chemically inactive<br />Anions<br />Cations<br />
    13. 13. Problem<br />11<br />Lattice energy of an ionic compounds depends upon<br />Charge on the ion only<br />Size of the ion only<br />Packing of ions only <br />Charge on the ion and size of the ion<br />
    14. 14. 12<br />Problem<br />The highest electrical conductivity of the following aqueous solutions is of<br />0.1 M acetic acid<br />0.1 M chloroacetic acid<br />0.1 M fluoroacetic acid <br />0.1 M difluoroacetic acid<br />
    15. 15. Problem<br />13<br />Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al3+ + 3e− ->Alo<br />To prepare 5.12 kg of aluminium metal by this method would require<br />5.49 ×107 C of electricity<br />1.83 ×107 C of electricity<br />5.49 ×104 C of electricity <br />5.49 ×101 C of electricity<br />
    16. 16. Problem<br />14<br />Consider an endothermic reaction, X->Y with the activation energies Eb and Ef<br />for the backward and forward reactions, respectively. In general<br />Eb < Ef<br />Eb > Ef<br />Eb = Ef<br />There is no definite relation between Eb and Ef<br />
    17. 17. Problem<br />15<br />Consider the reaction: N 2 + 3H 2 ->2NH3 carried out at constant temperature and pressure. If ΔH and ΔU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?<br />ΔH = 0 <br />ΔH = ΔU<br />ΔH < ΔU <br />ΔH > ΔU<br />
    18. 18. Problem<br />16<br />Which one of the following statements is NOT true about the effect of an increase in temperature on the distribution of molecular speeds in a gas?<br />The most probable speed increases<br />The fraction of the molecules with the most probable speed increases<br />The distribution becomes broader<br />The area under the distribution curve remains the same as under the lower temperature<br />
    19. 19. 17<br />Problem<br />The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solution VS, could be<br />a.<br />b.<br />c.<br />d.<br />
    20. 20. Problem<br />18<br />The solubility product of a salt having general formula MX2, in water is: 4 ×10−12. The concentration of M2+ ions in the aqueous solution of the salt is<br />2.0 ×10−6 M <br />1.0 ×10−4 M<br />1.6 ×10−4 M<br />4.0 ×10−10 M<br />
    21. 21. Problem<br />19<br />Benzene and toluene form nearly ideal solutions. At 20oC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20oC for a solution containing 78 g of benzene and 46 g of toluene in torr is<br />50 <br />25<br />37.5<br />53.5<br />
    22. 22. Problem<br />20<br />The exothermic formation of ClF3 is represented by the equation:<br />Which of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3?<br />Increasing the temperature<br />Removing Cl2<br />Increasing the volume of the container<br />Adding F2<br />
    23. 23. Problem<br />21<br />Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?<br /> 1.20 M<br />1.50 M<br />1.344 M<br />2.70 M<br />
    24. 24. Problem<br />22<br />For the reaction<br />(Kc = 1.8 ×10−6 at 184o C)<br />(R = 0.0831 kJ / (mol.K)<br />When Kp and Kcare compared at 184oC, it is found that<br />Kp is greater than Kc<br />Kp is less than Kc<br />Kp = Kc<br />Whether Kp is greater than, less than or equal to Kc depends upon the total gas pressure<br />
    25. 25. Problem<br />23<br />Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be<br />3.98 ×108<br />3.88 ×106<br />3.68 ×10 −6<br />3.98 ×10−6<br />
    26. 26. Problem<br />24<br />A reaction involving two different reactants can never be<br />Unimolecular reaction<br />First order reaction<br />second order reaction <br />Bimolecular reaction<br />
    27. 27. Problem<br />25<br />If we consider that 1/6 in place of 1/12 mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will<br />Decrease twice<br />Increase two fold<br />Remain unchanged<br />Be a function of the molecular mass of the substance<br />
    28. 28. Problem<br />26<br />In a multi – electron atom, which of the following orbitals described by the three<br />quantum numbers will have the same energy in the absence of magnetic acid and<br />electric fields?<br />(a) n = 1, l = 0, m = 0<br />(b) n = 2, l = 0, m = 0<br />(c) n = 2, l = 1, m = 1<br />(d) n = 3, l = 2, m = 1<br />(e) n = 3, l = 2, m = 0<br />(a) and (b)<br /> (b) and (c)<br /> (c) and (d) <br /> d) and (e)<br />
    29. 29. Problem<br />27<br />During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are<br />Sn and Ag <br />Pb and Zn<br />Ag and Au<br />Fe and Ni<br />
    30. 30. Problem<br />28<br />Calculate Using appropriate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25°C<br />517.2 <br />552.7<br />390.7 <br />217.5<br />
    31. 31. Problem<br />29<br />A schematic plot of In Keqversus inverse of temperature for a reaction is shown<br />Below <br />The reaction must be <br />exothermic <br />Endothermic<br />one with negligible enthalpy change <br />highly spontaneous at ordinary temperature<br />
    32. 32. Problem<br />30<br />The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?<br />magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.<br />sodium sulphate solution causes coagulation in both sols<br />mixing the sols has no effect<br />coagulation in both sols can be brought about by electrophoresis<br />
    33. 33. Problem<br />31<br />Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point.<br />LiCl<br />NaCl<br />KCl<br />RbCl<br />
    34. 34. Problem<br />32<br />Heating mixture of Cu2O and Cu2S will give<br />Cu + SO2<br />Cu + SO3<br />CuO + CuS <br />Cu2SO3<br />
    35. 35. Problem<br />33<br />The molecular shapes of SFF4 , CFF4 and XeF4 are<br />the same with 2,0 and 1 lone pairs of electrons on the central atom, respectively<br />the same with 1, 1 and 1 lone pair of electrons on the central atoms, respectively<br />different with 0, 1 and 2 lone pair of electrons on the central atoms, respectively<br />different with 1, 0 and 2 lone pairs of electron on the central atoms respectively<br />
    36. 36. Problem<br />34<br />The number and type of bonds between two carbon atoms in calcium carbide are<br />One sigma, one pi<br />One sigma, two pi<br />Two sigma, one pi <br />Two sigma, two pi<br />
    37. 37. Problem<br />35<br />The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution is<br />+4 <br />+6<br />+2<br />+3<br />
    38. 38. Problem<br />36<br />The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is<br />zero <br />two<br />one <br />three<br />
    39. 39. Problem<br />37<br />What is the conjugate base of OH-?<br />O2<br />H2O<br />O-<br />O-2<br />
    40. 40. Problem<br />38<br />The correct order of the thermal stability of hydrogen halides (H – X) is<br />HI > HBr > HCl > HF <br />HF > HCl > HBr > HI<br />HCl < HF > HBr < HI <br />HI > HCl < HF < HBr<br />
    41. 41. Problem<br />39<br />Heating an aqueous solution of aluminium chloride to dryness will give<br />AlCl3<br />Al2Cl6<br /> Al2O3<br /> Al(OH)C2<br />
    42. 42. Problem<br />40<br />Calomel (Hg2Cl2) on reaction with ammonium hydroxide gives<br />HgNH2Cl <br />NH2 – Hg – Hg – Cl<br />Hg2O <br />HgO<br />
    43. 43. Problem<br />41<br />In which of the following arrangements the order is NOT according to the property indicated against it?<br />Al3+ < Mg2+ < Na+ < F Increasing ionic size<br /> B < C < N < O Increasing first ionization enthalpy<br />I < Br < F < Cl Increasing electron gain enthalpy (with negative sign)<br />Li < Na < K < Rb<br /> Increasing metallic radius<br />
    44. 44. Problem<br />42<br />In silicon dioxide<br />Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms<br />Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms<br />Silicon atoms is bonded to two oxygen atoms<br />there are double bonds between silicon and oxygen atoms<br />
    45. 45. Problem<br />43<br />Of the following sets which one does NOT contain isoelectronic species?<br />PO-34 ,SO-24 ,ClO-4<br />CN- ,N2,C-22<br />SO-23 ,CO-23 ,NO-3<br />BO-33 ,CO-23 ,NO-3<br />
    46. 46. Problem<br />44<br />The lanthanide contraction is responsible for the fact that<br />Zr and Y have about the same radius <br />Zr and Nb have similar oxidation state<br />Zr and Hf have about the same radius <br />Zr and Zn have the same oxidation<br />
    47. 47. Problem<br />45<br />The IUPAC name of the coordination compound K3[Fe(CN)6] is<br />Potassium hexacyanoferrate (II) <br />Potassium hexacyanoferrate (III)<br />Potassium hexacyanoiron (II) <br />tripotassiumhexcyanoiron (II)<br />
    48. 48. Problem<br />46<br />Which of the following compounds shows optical isomerism?<br />[Cu(NH3)4]+2 <br />[ZnCl4]-2<br />[Cr(C2O)4)3]-3 <br />[Co(CN)6] -3 <br />
    49. 49. Problem<br />47<br />Which one of the following cyano complexes would exhibit the lowest value of<br />paramagnetic behaviour? <br />[Cr(CN)6]-3 <br />[Mn(CN) 6] -3 <br />[Fe(CN) 6] -3 <br />[Co(CN) 6] -3 <br />(At. No. Cr = 24, Mn = 25, Fe = 26, Co = 27)<br />
    50. 50. Problem<br />48<br />2 methylbutane on reacting with bromine in the presence of sunlight gives mainly<br />1 – bromo -2 - methylbutane<br />2 – bromo -2 - methylbutane<br />2 – bromo -3 - methylbutane<br />1 – bromo -3 – methylbutane<br />
    51. 51. Problem<br />49<br />The photon of hard gamma radiation knocks a proton out of Mg nucleus to form<br />the isotope of parent nucleus <br />the isobar of parent nucleus<br />the nuclide Na<br />the isobar of Na<br />
    52. 52. Problem<br />50<br />The best reagent to convert pent -3- en-2-ol into pent -3-en-2-one is<br />Acidic permanganate <br />Acidic dichromate<br />Chromic anhydride in glacial acetic acid <br />Pyridiniumchloro – chromate<br />
    53. 53. Problem<br />51<br />Tertiary alkyl halides are practically inert to substitution by SN 2 mechanism because of<br />Insolubility<br />Instability<br />inductive effect <br />steric hindrance<br />
    54. 54. Problem<br />52<br />In both DNA and RNA, heterocyclic base and phosphate ester linkages are at-<br />C and C respectively of the sugar molecule<br />C and C respectively of the sugar molecule<br />C and C respectively of the sugar molecule<br />C and C respectively of the sugar molecule<br />
    55. 55. Problem<br />53<br />Reaction of one molecule of HBr with one molecule of 1,3-butadiene at 400C gives Predominantly<br />3-bromobutene under kinetically controlled conditions<br />1-bromo-2-butene under thermodymically controlled conditions<br />3-bromobutene under thermodynamically controlled conditions<br />1-bromo-2-butene under kinetically controlled conditions<br />
    56. 56. Problem<br />54<br />Among the following acids which has the lowest pKa value?<br />CH3COOH<br />HCOOH<br />(CH3)2COOH<br />CH3CH2COOH<br />
    57. 57. Problem<br />55<br />The decreasing order of nucleophilicity among the nucleophiles<br />,<br />CH3O-<br />CN-<br />,<br />(a), (b), (c), (d) <br />(d), (c), (b), (a)<br />(b), (c), (a), (d) <br />(c), (b), (a), (d)<br />
    58. 58. Problem<br />56<br />Which one of the following methods is neither meant for the synthesis nor for<br />separation of amines?<br />Hinsberg method<br />Hofmann method<br />Wurtz reaction<br />Curtius reaction<br />
    59. 59. Problem<br />57<br />Which of the following is fully fluorinated polymer?<br />Neoprene <br />Teflon<br />Thiokol <br />PVC<br />
    60. 60. Problem<br />58<br />Of the five isomeric hexanes, the isomer which can give two monochlorinated<br />compounds is<br /> n-hexane<br />2, 3-dimethylbutane<br />2,2-dimethylbutane<br />2-methylpentane<br />
    61. 61. Problem<br />59<br />Alkyl halides react with dialkyl copper reagents to give<br />alkenes <br />alkyl copper halides<br />alkanes <br />alkenyl halides<br />
    62. 62. Problem<br />60<br />Acid catalyzed hydration of alkenes except ethene leads to the formation of<br />primary alcohol<br />secondary or tertiary alcohol<br />mixture of primary and secondary alcohols<br />mixture of secondary and tertiary alcohols<br />
    63. 63. Problem<br />61<br />Amongst the following the most basic compound is<br />Benzylamine<br />aniline<br />acetanilide <br />p-nitroaniline<br />
    64. 64. Problem<br />62<br />Which types of isomerism is shown by 2,3-dichlorobutane?<br />Diastereo<br />Optical<br />Geometric <br />Structural<br />
    65. 65. Problem<br />63<br />The reaction<br />is fastest when X is<br />Cl<br />NH2<br />OC2H5<br />OCOR<br />
    66. 66. Problem<br />64<br />Elimination of bromine from 2-bromobutane results in the formation of-<br />equimolar mixture of 1 and 2-butene<br />predominantly 2-butene<br />predominantly 1-butene<br />predominantly 2-butyne<br />
    67. 67. Problem<br />65<br />Equimolar solutions in the same solvent have<br />Same boiling point but different freezing point<br />Same freezing point but different boiling point<br />Same boiling and same freezing points<br />Different boiling and different freezing points<br />
    68. 68. Problem<br />66<br />Which of the following statements in relation to the hydrogen atom is correct?<br />3s orbital is lower in energy than 3p orbital<br />3p orbital is lower in energy than 3d orbital<br />3s and 3p orbitals are of lower energy than 3d orbital<br />3s, 3p and 3d orbitals all have the same energy<br />
    69. 69. Problem<br />67<br />The structure of diborane (B2H6) contains<br />four 2c-2e bonds and two 3c-2e bonds<br />two 2c-2e bonds and four 3c-2e bonds<br />two 2c-2e bonds and two 3c-3e bonds<br />four 2c-2e bonds and four 3c-2e bonds<br />
    70. 70. Problem<br />68<br />The value of the ‘spin only’ magnetic moment for one of the following configurations is 2.84 BM. The correct one is<br />d4 (in strong ligand filed)<br />d4 (in weak ligand field)<br />d3 (in weak as well as in strong fields)<br />d5 (in strong ligand field)<br />
    71. 71. Problem<br />69<br />Which of the following factors may be regarded as the main cause of lanthanide<br />contraction?<br />Poor shielding of one of 4f electron by another in the subshell<br />Effective shielding of one of 4f electrons by another in the subshell<br />Poorer shielding of 5d electrons by 4f electrons<br />Greater shielding of 5d electrons by 4f electrons<br />
    72. 72. Problem<br />70<br />Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as<br /> a Schiff’s base <br />an enamine<br /> an imine<br />an amine<br />
    73. 73. Problem<br />71<br />p-cresol reacts with chloroform in alkaline medium to give the compound A which<br />adds hydrogen cyanide to form, the compound B. The latter on acidic hydrolysis<br />gives chiral carboxylic acid. The structure of the carboxylic acid is<br />a.<br />b.<br />c.<br />d.<br />
    74. 74. Problem<br />72<br />An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives NH3alongwith a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is<br />CH3NCO<br /> CH3CONH2<br />(NH2) 2CO <br />CH3CH2CONH2<br />
    75. 75. Problem<br />73<br />If the bond dissociation energies of XY, X2 and Y2 (all diatomic molecules) are in the ratio of 1:1:0.5 and fΔ H for the formation of XY is -200 kJ mole-1. The bond<br />dissociation energy of X2 will be<br />100 kJ mol-1<br />200 kJ mol-1<br />300 kJ mol-1<br />400 kJ mol-1<br />
    76. 76. Problem<br />74<br />t1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If the rate constant for a first order reaction is K, the t1/4 can be written as<br />0.10 / K<br />0.29 / K<br />0.69 / K <br />0.75 / K<br />
    77. 77. Problem<br />75<br />An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. Pressure. Ammonium hydrogen sulphide<br />decomposes to yield NH3 and H2S gases in the flask. When the decomposition<br />reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm. The<br />equilibrium constant for NH4HS decomposition at this temperature is<br />0.30<br />0.18<br /> 0.17<br />0.11<br />
    78. 78. FOR SOLUTION VISIT WWW.VASISTA.NET<br />

    ×