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Aieee chemistry - 2007

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    • 1. AIEEE –Past papers
      CHEMISTRY- UNSOLVED PAPER - 2007
    • 2. SECTION – I
      Single Correct Answer Type
      This Section contains 40multiple choice questions. Each question has four choices A), B), C) and D) out of which ONLY ONE is correct.
    • 3. 01
      Problem
      The energies of activation for forward and reverse reactions for A2 + B 2 2AB are 180 kJ mol−1 and 200 kJ mol −1 respectively. The presence of catalyst lowers the activation energy of both (forward and reverse) reactions by 100 kJ mol −1. The enthalpy change of the reaction (A2 + B 2 -> 2AB ) in the presence of catalyst will be (in kJ mol −1)
      300
      120
      280
      20
    • 4. Problem
      02
      The cell Zn|Zn2+ (1M) ||Cu 2+1M |(CuE0cell 1.10V ), was allowed to be completely discharged at 298 K. The relative concentration of Zn2+to Cu2+
      is
      antilog (24.08)
      37.3
      1037.3
      9.65 ×104
    • 5. Problem
      03
      The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is
      4.5
      2.5
      9.5
      7.0
    • 6. Problem
      04
      Consider the reaction,
      2A +B ->Pr oducts
      When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is
      L mol-1 s-1
      no unit
      mol L-1 s-1
      s-1
    • 7. Problem
      05
      Identify the incorrect statement among the following
      d-Block elements show irregular and erratic chemical properties among themselves
      La and Lu have partially filled d orbitals and no other partially filled orbitals
      The chemistry of various lanthanoids is very similar
      4f and 5f orbitals are equally shielded
    • 8. Problem
      06
      Which one of the following has a square planar geometry?
      [CoCl 4 ]2-
      [FeCl 4 ] 2-
      [NiCl 4 ] 2-
      [PtCl4 ] 2-
    • 9. Problem
      07
      Which of the following molecules is expected to rotate the plane of plane polarized light?
      a.
      b.
      c.
      d.
    • 10. 08
      Problem
      The secondary structure of a protein refers to
      α-helical backbone
      hydrophobic interactions
      sequence of α-amino acids
      fixed configuration of the polypeptide backbone
    • 11. Problem
      09
      Which of the following reactions will yield 2, 2-dibromopropane?
      CH 3 − C ≡ CH+ 2HBr->
      CH 3 CH ≡ CHBr +HBr->
      CH ≡ CH+ 2HBr->
      CH 3 − CH = CH2 +HBr ->
    • 12. Problem
      10
      In the chemical reaction, CH3 CH2 NH2 − CHCl3 + 3KOH-> A + B + 3H2O, the compound (A) and (B) are respectively
      C2H5CN and 3KCl
      CH3CH2CONH2 and 3KCl
      C2H5NC and K2CO3
      C2H5NC and 3KCl
    • 13. Problem
      11
      The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly
      benzoyl chloride
      benzyl chloride
      o-and p-chlorotoluene
      m-chlorotoluene
    • 14. 12
      Problem
      Presence of a nitro group in a benzene ring
      activates the ring towards electrophilic substitution
      renders the ring basic
      deactivates the ring towards nucleophilic substitution
      deactivates the ring towards electrophilic substitution
    • 15. Problem
      13
      In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed?
      C2 ->C
      NO->NO
      O2 ->O
      N2->N
    • 16. Problem
      14
      The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because
      the 5f orbitals are more buried than the 4f orbitals
      there is a similarity between 4f and 5f orbitals in their angular part of the wave function
      the actinoids are more reactive than the lanthanoids
      the 5f orbitals extend further from the nucleus than the 4f orbitals
    • 17. Problem
      15
      Equal masses of methane and oxygen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by oxygen is
      a.
      b.
      c.
      d.
    • 18. Problem
      16
      A 5.25 % solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol −1 ) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm−3, molar mass of the substance will be
      90.0 g mol−1
      115.0 g mol −1
      105.0 g mol −1
      210.0 g mol −1
    • 19. 17
      Problem
      Assuming that water vapour is an ideal gas, the internal energy (ΔU) when 1 mol of water is vapourised at 1 bar pressure and 100°C, (Given: Molar enthalpy of vapourization of water at 1 bar and 373 K = 41 kJ mol −1 and R = 8.3 J mol −1 K −1) will be
      4.100 kJ mol−1
      3.7904 kJ mol −1
      37.904 kJ mol −1
      41. 00 kJ mol −1
    • 20. Problem
      18
      In a sautrated solution of the sparingly soluble strong electrolyte AgIO3 (Molecular mass = 283) the equilibrium which sets in is AgIO3(6) Ag+(aq) + IO− 3(aq) If the solubility product constant Ksp of AgIO3 at a given temperature is 1.0 × 10−8, what is the mass of AgIO3 contained in 100 ml of its saturated solution?
      28.3 × 10−2 g
      2.83 × 10−3 g
      1.0 × 10−7 g
      1.0 × 10−4 g
    • 21. Problem
      19
      A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial activity is ten times the permissible value, after how many days will it be safe to enter the room?
      1000 days
      300 days
      10 days
      100 days
    • 22. Problem
      20
      Which one of the following conformation of cyclohexane is chiral?
      Twist boat
      Rigid
      Chair
      Boat
    • 23. Problem
      21
      Which of the following is the correct order of decreasing SN 2 reactivity?
      RCH 2 X > R3CX > R 2 CHX
      RCH 2 X > R 2 CHX > R 3 CX
      R 3 CX > R 2 CHX > RCH 2 X
      R 2 CHX > R 3 CX > RCH 2 X
    • 24. Problem
      22
      In the following sequence of reactions,
      the compound ‘D’ is
      butanal
      n-butyl alcohol
      n-propyl alcohol
      propanal
    • 25. Problem
      23
      Which of the following sets of quantum numbers represents the highest energy of an atom?
      n = 3, l = 2,m = 1,s = +1/ 2
      n = 3, l = 2,m = 1,s = +1/ 2
      n = 4, l = 0,m = 0,s = +1/ 2
      n = 3, l = 0,m = 0,s = +1/ 2
    • 26. Problem
      24
      Which of the following hydrogen bonds is the strongest?
      O−H…….N
      F−H…….F
      O−H…….O
      O−H…….F
    • 27. Problem
      25
      In the reaction
      6 L HCl(aq) is consumed for every 3L H2(g) produced
      33.6 L H2(g) is produced regardless of temperature and pressure for every mole Al that reacts
      67.2 L H2(g) at STP is produced for every mole Al that reacts
      11.2 H2(g) at STP is produced for every mole HCl(aq) consumed
    • 28. Problem
      26
      Regular use of which of the following fertilizer increases the acidity of soil?
      Potassium nitrate
      Urea
      Superphosphate of lime
      Ammonium sulphate
    • 29. Problem
      27
      Identify the correct statement regarding a spontaneous process
      For a spontaneous process in an isolated system, the change in entropy is positive
      Endothermic processes are never spontaneous
      Exothermic processes are always spontaneous
      Lowering of energy in the reaction process is the only criterion for spontaneity
    • 30. Problem
      28
      Which of the following nuclear reactions will generate an isotope ?
      neutron particleemission
      positron emission
      α-particleemission
      β-particleemission
    • 31. Problem
      29
      The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25°C are given below:
      ∧0 CH3COONa∧ 0 = 91.0 S cm2 / equiv2
      ∧0 HCl= 426.2 S cm2 / equiv
      What additional information/quantity one needs to calculate ∧0 of an aqueous solution of acetic acid?
      ∧0 of NaCl
      ∧0 of CH3COOK
      ∧0 The limiting equivalent conductance of
      ∧0 of chloroacetic acid (C/CH2COOH)
    • 32. Problem
      30
      Which one of the following is the strongest base in aqueous solution?
      Trimethylamine
      Aniline
      Dimethylamine
      Methylamine
    • 33. Problem
      31
      The compound formed as a result of oxidation of ethyl benzene by KMnO4 is
      benzophenone
      acetophenone
      benzoic acid
      benzyl alcohol
    • 34. Problem
      32
      The IUPAC name of is
      1, 1-diethyl-2,2-dimethylpentane
      4, 4-dimethyl-5, 5-diethylpentane
      5, 5-diethyl-4, 4-diemthylpentane
      3-ethyl-4, 4-dimethylheptane
    • 35. Problem
      33
      Which of the following species exhibits the diamagnetic behaviour?
      O
      O
      O 2
      NO
    • 36. Problem
      34
      The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
      GeX 2 « SiX 2 « SnX 2 « PbX 2
      SiX2 « GeX 2 « PbX2 « SnX 2
      SiX 2 « GeX 2 « SnX2 « PbX 2
      PbX 2 « SnX 2 « GeX 2 « SiX 2
    • 37. Problem
      35
      Identify the incorrect statement among the following
      Ozone reacts with SO2 to give SO3
      Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O
      Cl2 reacts with excess of NH3 to give N2 and HCl
      Br2 reacts with hot and strong NaOH solution to give NaBr, NaBrO4 and H2O
    • 38. Problem
      36
      The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizinig order of the polarizing power of the cationic species, K+, Ca2+, Mg2+, Be2+?
      Mg2+,Be2+,K+ ,Ca2+
      Be2+,K + ,Ca2+,Mg2+
      K + ,Ca2+,Mg2+,Be2+
      Ca2+,Mg2+,Be2+,K+
    • 39. Problem
      37
      The density (in g mL −1) of a 3.60 M sulphuric acid solution that is 29% H2SO4 (Molar mass = 98 g mol−1) by mass will be
      1.64
      1.88
      1.22
      1.45
    • 40. Problem
      38
      The first and second dissociation constants of an acid H2A are 1.0 × 10−5 and 5.0 × 10−10 respectively. The overall dissociation constant of the acid will be
      5.0 × 10−5
      5.0 × 1015
      5.0 × 10−15
      0.0 × 105
    • 41. Problem
      39
      A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be
      350
      300
      700
      360
    • 42. Problem
      40
      In conversion of lime-stone to lime,
      the vales of ΔH° and ΔS° are +179.1 kJ mol−1 and 160.2 J/K respectively at 298 K and 1 bar. Assuming that ΔH° do not change with temperature, temperature above which conversion of limestone to lime will be spontaneous is
      1008 K
      1200
      845 K
      1118 K
    • 43. FOR SOLUTION VISIT WWW.VASISTA.NET