Aieee Chemistry 2006


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    1. 1. AEEE –Past papers<br />CHEMISTRY - UNSOLVED PAPER - 2006<br />
    2. 2. SECTION – I<br />Straight Objective Type<br />This section contains multiple choice questions numbered 55 . Each question has 4 choices (A), (B), (C) and (D), out of which ONLY ONE is correct.<br />
    3. 3. 01<br />Problem<br />HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give<br />CH3CHO and CH3Br<br /> BrCH2CHO and CH3OH<br />BrCH2 – CH2 – OCH3<br /> H3C – CHBr – OCH3<br />
    4. 4. Problem<br />02<br />The IPUAC name of the compound shown below is :<br /> <br />2-bromo-6-chlorocyclohex-1-ene<br />6-bromo-2-chlorocyclohexene<br />3-bromo-1-chlorocyclohexene<br />1-bromo-3-chlorocyclohexene<br />
    5. 5. Problem<br />03<br />The increasing order of the rate of HCN addition to compounds A-D is : <br />HCHO<br />CH3COCH3<br />PhCOCH3<br />PhCOPh<br />A < B < C < D<br />D < B < C < A<br />D < C < B < A<br />C < D < B < A<br />
    6. 6. Problem<br />04<br />How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms ? <br /> <br />0.02 <br />3.125 x 10-2<br />1.25 x 10-2<br />2.5 x 10-2<br />
    7. 7. Problem<br />05<br />According to Bohr’s theory, he angular momentum of an electron in 5th orbit is : <br /> <br />25<br />b. 1.0 <br />c. 10 <br />d. 2.5<br />
    8. 8. Problem<br />06<br />Which of the following molecules/ions does not contain unpaired electrons ? <br /> <br />O <br />B2<br />N <br />O2 <br />
    9. 9. Problem<br />07<br />Total volume of toms present in a face-centred cubic unit cell of metal is (r is atomic radius) :<br />a.<br />b.<br />c.<br />d.<br />
    10. 10. Problem<br />08<br />A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will: <br /> <br />Remain unchanged <br />Triple <br />Increases by a factor of 4 <br />Double <br />
    11. 11. Problem<br />09<br />Which of the following chemical reactions depicts the oxidizing behaviour of H2SO4 ? <br /> <br />2HI + H2SO4 I2 + SO2 + 2H2O<br />Ca(OH)2 + H2SO4 CaSO4 + 2H2O<br />NaCl + H2SO4 NaHSO4 + HCl<br />2PCl5 + H2SO4 2POCl3 + 2HCl + SO2Cl2<br />
    12. 12. Problem<br />10<br />The IUPAC name for he complex [Co(NO2)(NH3)5]Cl2 is : <br />Nitrite-N-pentaminecobalt (III) chloride<br />Nitrite-N-pentamminecobalt (II) chloride<br />Pentammine nitrite-N-cobalt (II) chloride<br />Pentaamine nitrite-N-cobalt (III) chloride<br />
    13. 13. Problem<br />11<br />The term anomers of glucose refers to : <br /> Isomers of glucose that differ configuration at carbons one and four (C-1 and C - 4)<br />A mixture of (D)-glucose and (L)- glucose <br />Enantiomers of glucose <br />Isomers of glucose that differ in configuration at carbon one (C - 1)<br />
    14. 14. Problem<br />12<br />In the transformation of if one emission is an -particle, what should be the other emission (s) ? <br /> <br />Two -β<br />Two -βand one + β<br />One β and one <br />One β and one β<br />
    15. 15. Problem<br />13<br />Phenyl magnesium bromide reacts with methanol to give :<br />A mixture of anisol and Mg(OH)Br<br />A mixture of benzene and Mg(OMe)Br<br />A mixture of toluence and Mg(OH)Br<br />A mixture Phenol and Mg (Me)Br<br />
    16. 16. Problem<br />14<br /> The decreasing order of the rate of the above reaction with nucleophiles (Nu-) A to D is : [Nu- = (A) PhO-, (B)AcO-, (C) HO-, (D) CH3O-]<br /> <br />D > C > A < B<br />D > C > B > A<br />A > B > C > D<br />B > D > C > A<br />
    17. 17. Problem<br />15<br />The pyrimidine bases present in DNA are : <br /> <br />Cytosine and adenine <br />Cytosine and guanine <br />Cytosine and thymine <br />Cytosine and uracil<br />
    18. 18. Problem<br />16<br />Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is : <br />a. CH3CH2CH(OH)CH2CH3<br />b. C6H5CH2CH2OH <br />PhCHOHCH3<br />  <br />
    19. 19. Problem<br />17<br />The increasing order of stability of the following free radicals is : <br /> <br />(CH3)2 H < (CH3)3 < (C6H5)2 H < (C6H5)3<br />(C6H5)3 (C6H5)2 H< (CH3)3 < (CH3)2 H<br />(C6H5)2 H<(C6H5)3 <(CH3)3 < (CH3)2 H<br />(CH3)2 H < (CH3)3 < (C6H5)3 < (C6H5)2 H<br />
    20. 20. Problem<br />18<br />Uncertainty in the position of an electron (mass = 9.1 x 10-31 kg) moving with a velocity 300 ms-1, accurate upon 0.001% will be : <br /> <br />19.2 x 10-2 m<br />5.76 x 10-2 m<br />1.92 x 10-2 m<br />3.84 x 10-2 m<br />(h= 6.63 x 10-34 Js)<br />
    21. 21. Problem<br />19<br />Phosphorus pentachloride dissociates as follows, in a closed reaction vessel, <br /> If total pressure at equilibrium of the reaction mixture is P and degree of dissociation of PCl5 is x, the partial pressure of PCl3 will be: <br />a.<br />b.<br />c.<br />d.<br />
    22. 22. Problem<br />20<br />The standard enthalpy of formation at 298 K for methane, CH4(g), is -78.4 kJ mol-1. The additional information required to determine the average energy for C-H bond formation would be: <br /> <br />The dissociation energy of H2 and enthalpy of sublimation of carbon <br />Latent heat of vaporization of methane <br />The first four ionization energies of carbon and electron gain enthalpy of hydrogen <br />The dissociation energy of hydrogen molecule, H2<br />
    23. 23. Problem<br />21<br />Among the following mixtures, dipole-dipole as the major interaction, is present in: <br /> <br />Benzene and ethanol <br />Acetonitrile and acetone <br />KCl and water <br />Benzene and carbon tetrachloride <br />
    24. 24. Problem<br />22<br />Fluorobenzene (C6H5F) can be synthesized in the laboratory: <br /> <br />By heating phenol with HF and KF<br />From aniline by diazotization followed by heating the diazonium salt with HBF4<br />By direct fluorination of benzene with F2 gas <br />By reacting bromobenzene with NaF solution <br />
    25. 25. Problem<br />23<br />A metal, M forms chlorides in its + 2 and + 4 oxidation states. Which of the following statements about these chlorides is correct? <br /> <br />MCl2 is more volatile than MCl4<br />MCl2 is more soluble in anhydrous ethanol than MCl4<br />MCl2 is more ionic than MCl4<br />MCl2 is more easily hydrolysed than MCl4<br />
    26. 26. Problem<br />24<br />Which of the following statement is true ? <br /> <br />H3PO3 is stronger acid than H2SO3­<br />In aqueous medium HF is a stronger acid than HCl<br />HClO4 is a weaker acid than HClO3<br />HNO3 is a stronger acid than HNO2<br />
    27. 27. Problem<br />25<br />The molar conductivities at infinite dilution in water at 250C are 91.0 and 426.2 S cm2/ mol respectively. To calculate the additional value required is: <br />a.<br />b.<br />c.<br />d.<br />
    28. 28. Problem<br />26<br />Which one of the following sets of ions represents a collection of isoelectronic species ? <br /> <br />K+, Cl-, Ca2+, Sc3+<br />Ba2+, Sr2+, K+, S2-<br />N3-, O2-, F-, S2-<br />Li+, Na+, Mg2+, Ca2+<br />
    29. 29. Problem<br />27<br />The correct order of increasing acid strength of the compounds: <br />CH2CO2H<br />MeOCH2CO2H<br />CF3CO2H<br /> <br />B < D < A < C<br />D < A < C < B<br />D < A < B < C<br />A < D < C < B<br />
    30. 30. Problem<br />28<br />In which of the following molecules/ions all the bonds are not equal? <br /> <br />SF4<br />SiF4<br />XeF4<br />BF4<br />
    31. 31. Problem<br />29<br />What products are expected from the disproportionation reaction of hypochlorous acid? <br /> <br />HClO3 and Cl2O<br />HClO2 and HClO4<br />HCl and Cl2O<br />HCl and HClO3<br />
    32. 32. Problem<br />30<br />Nickel (Z = 28) combines with a uninegativemonodentateligand X- to form a paramagnetic complex [NiX4]2-. The number of unpaired electron(s) in the nickel and geometry of this complex ion are respectively : <br /> <br />One, tetrahedral <br />Two, tetrahedral<br />One, square planar <br />Two, square planar <br />
    33. 33. Problem<br />31<br />In Fe(CO)s, the Fe-C bond possesses:<br /> <br /> Character only <br />Both and characters <br />Ionic character <br /> Character only <br />
    34. 34. Problem<br />32<br />The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is : <br /> <br />F < S < P < B<br />P < S < B < F<br />B < P < S < F<br />B < S < P < F<br />
    35. 35. Problem<br />33<br />An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system, If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct ? <br /> <br />(Tf)irrev > (Tf)rev<br />Tf > Ti for reversible process but Tf = Ti for irreversible process <br />(Tf)rev = (Tf)irrev<br />Tf = Ti for both reversible and irreversible <br />
    36. 36. Problem<br />34<br />In languir’s model of adsorption of a gas on a solid surface : <br /> <br />The rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered <br />The adorption at a single site on the surface may involve multiple molecules at the same time <br />The mass of gas striking a given area of surface is proportional to the pressure of the gas <br />The mass of gas striking a given area of surface is independent of the pressure of the gas <br />
    37. 37. Problem<br />35<br />Rate of a reaction can be expressed by Arrhenius equation as: k = A e−E /RT In this equation, E represents<br />the energy above which all the colliding molecules will react<br />the energy below which colliding molecules will not react<br />the total energy of the reacting molecules at a temperature, T<br />the fraction of molecules with energy greater than the activation energy of the reaction<br />
    38. 38. Problem<br />36<br />The structure of the major product formed in the following reaction is : <br />a.<br />b.<br />c.<br />d.<br />
    39. 39. Problem<br />37<br />Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces:  <br />4-phenylcyclopentene<br />2-phenylcylocpentene <br />1-phenylcylopentene <br />3-phenylcylopentene<br />
    40. 40. Problem<br />38<br />Increasing order of stability among the three main conformations (i.e., Eclipse, Anti, Gauche) of 2-fluoroethanol is : <br /> <br />Eclipse, Gauche, Anti <br />Gauche, Eclipse, Anti<br />Eclipse, Anti, Gauche<br />Anti, Gauche, Eclipse <br />
    41. 41. Problem<br />39<br />The structure of the compound that gives a tribromo derivative on treatment with bromine water is<br />a.<br />b.<br />c.<br />d.<br />
    42. 42. Problem<br />40<br />The decreasing values of bond angles form NH3(1060) to SbH3(1010) down group-15 of the periodic table is due to: <br /> <br />Increasing bp-bp repulsion <br />Increasing p-orbital character in sp3<br />Decreasing lp-bp repulsion <br />Decreasing electronegativity <br />
    43. 43. Problem<br />41<br />The alkene formed as a major product in the above elimination reaction is <br /> The ‘spin-only’ magnetic moment [in units of Bohr magneton, ( )] of Ni2+ in aqueous solution would be (Atomic number of Ni = 28) :<br />a. b.<br />c. d.<br /> <br />
    44. 44. Problem<br />42<br />The ‘spin – only’ magnetic moment in uints of Bohr magneton, of Ni2+ in aueous solution would be (automatic number of Ni =28):<br />2.84<br />4.90<br />0<br />1.73<br />
    45. 45. Problem<br />43<br />The equilibrium constant for the reaction is <br />Kc= 4.9 x 10-2. The value of Kc for the reaction will be: <br /> <br />416<br />2.40 x 10-3<br />9.8 x 10-2<br />4.9 x 10-2<br />
    46. 46. Problem<br />44<br />Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture? <br /> <br />The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group <br />In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group <br />Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens <br />In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group<br />
    47. 47. Problem<br />45<br />Given the data at 250C,<br />Ag + I-AgI + e- ; E0 = 0.152 V<br />Ag Ag+ + e - ; E0 = - 0.800 V<br />What is the value of log Ksp for AgI ? <br />-8.12<br />+ 8.612<br />- 37.83<br />- 16.13<br />
    48. 48. Problem<br />46<br />The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr: <br />NO(g) + Br2(g) NOBr2 (g)<br />NOBr2 (g) + NO (g) 2NOBr(g)<br />If the second step is the rate determining step, the order of the reaction with respect to NO (g) is :<br /> <br />1<br />0<br />3<br />2<br />
    49. 49. Problem<br />47<br />Lanthanoid contraction is caused due to : <br /> <br />The appreciable shielding on outer electrons by 4f electrons from the nuclear charge <br />The appreciable shielding on outer electrons by 5d electrons from the nuclear charge <br />The same effective nuclear charge from Ce to Lu<br />The imperfect shielding on outer electrons by 4f electrons from the nuclear charge<br />
    50. 50. Problem<br />48<br />Resistance of a conductivity cell filled with a solution of an electrolyte of concentration 0.01 M is 100 . The conductivity of this solution is 1.29 S m-1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 . The molar conductivity of 0.02 M solution of the electrolyte will be : <br /> <br />124 x 10-4 S m2 mol-1<br />1240 x 10-4 S m2 mol-1<br />1.24 x 10-4 S m2 mol-1<br />12.4 x 10-4 S m2 mol-1<br />
    51. 51. Problem<br />49<br />The ionic mobility of alkali metal ions in aqueous solution is maximum for : <br /> <br />K+<br />Rb+<br />Li+<br />Na+<br />
    52. 52. Problem<br />50<br />Density of a 2.05 M solution of acetic acid in water is 1.02 g/ml. The molality of the solution is : <br /> <br />1.14 mol kg-1<br />3.28 mol kg-1<br />2.28 mol kg-1<br />0.44 mol kg-1<br />
    53. 53. Problem<br />51<br />The enthalpy changes for the following processes are listed below :<br />Cl2(g) = 2Cl(g), 242.3 kJ mol-1<br />I2(g) = 2I (g), 151.0 kJ mol-1<br />ICl (g) = I (g) + Cl (g), 211.3 kJ mol-1<br />I2(s) = I2 (g), 62.76 kJ mol-1<br />Given that the standard states for iodine and chlorine are I2(s) and Cl2(g), the standard enthalpy of formation of ICI (g) is : <br /> <br />- 14.6 kJ mol-1<br />-16.8 kJ mol-1<br />+ 16.8 kJ mol-1<br />+ 244.8 kJ mol-1<br />
    54. 54. Problem<br />52<br />How many EDTA (ethylenediaminetetra acetic acid) molecules are required to make an octanhedral complex with a Ca2+ ion? <br /> <br />Six <br />Three<br />One <br />Two <br />
    55. 55. Problem<br />53<br />The electrophile involved in the above reaction is :<br /> <br />Dichloromethylcation ( HCl2)<br />Dichlorocarbene (: CCl2)<br />Trichloromethyl anion ( Cl2)<br />Formylcation ( HO)<br />
    56. 56. Problem<br />54<br />18 g of glucose (C6H12O6) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 1000C is : <br /> <br />759.00 torr<br />7.60 torr<br />76.00 torr<br />752.40 torr<br />
    57. 57. Problem<br />55<br /> for the formation of carbon monoxide (CO) from its elements at 298 K is : (R = 8.314 JK-1 mol-1)<br /> <br />-1238.78 J mol-1<br />1238.78 J mol-1<br />-2477.57 J mol‑1<br />2477.57 J mol-1<br />