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AIPMT Chemistry 2008

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    • 1. aipmt–Past papers
      CHEMISTRY- UNSOLVED PAPER - 2008
    • 2. SECTION – I (Total Marks : 50)
      Single Correct Answer Type
      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
    • 3. 01
      Problem
      Which one of the following arrangements does not give the correct picture of the tends indicated against it?
      a.
      b.
      c.
      d.
    • 4. Problem
      02
      If a gas expand at a constant temperature, it indicate that
      Kinetic energy of molecule remain the same
      Number of molecule of gas increase
      Kinetic energy of molecule decrease
      Pressure of the gas increase
    • 5. Problem
      03
      The dissociation equilibrium of a gas AB2 can be represented as:
      The degree of dissociation is x & is smaller compared to 1. The expression to 1. The expressing relating the degree of dissociation (x) with equilibrium constant & total pressure P is
      a.
      b.
      c.
      d.
    • 6. Problem
      04
       The bromination of acetone that occurs in acid solution is represented by this equation These kinetic data were obtained for given reaction concentration. Initial concentration, M Initial rate, disappearance of
      Initial rate, disappearance of
      a.
      b.
      c.
      d.
    • 7. Problem
      Based on these data, the rate equation is
      a.
      b.
      c.
      d.
    • 8. Problem
      05
      If the concentration of OH- ions in the reaction
      Is decreased by 1/4times, then equilibrium concentration of will increased by
      64 times
      times
      8 times
      16 times
    • 9. Problem
      06
      What volume of measured at & 1 atm, is needed to burn completely 1L of propane gas measured under the same conditions?
      5L
      10L
      7L
      6L
    • 10. Problem
      07
      Equal volume of three acids solutions of pH 3, 4 & 5 are mixed in a vessel. What will be the ion concentration in the mixture?
      a.
      b.
      c.
      d.
    • 11. Problem
      08
      The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of
      Acid anhydrite > Amide >Ester > Acyl chloride
      Acyl chloride > Ester > Acid anhydrite > Amide
      Acyl chloride > Acid anhydrite > Ester > Amide
      Ester > Acyl chloride > Amide> Acid anhydrite
    • 12. Problem
      09
      In DNA, the complimentary bases are
      Adenine & Guanine; thymine & Cytosine
      Uracil & Adenine; Cytosine & Guanine
      Adenine & thymine; Guanine & Cytosine
      Adenine & thymine; Guanine & Uracil
    • 13. Problem
      10
      Base strength of
      is in order of
      (i)> (iii)> (ii)
      (i)> (ii) > (iii)
      (i)> (i)> (iii)
      (iii)> (ii) > (i)
    • 14. Problem
      11
      Equimolar solution of the following were prepare in water separately. Which one of the solution will record the highest pH?
      a.
      b.
      c.
      d.
    • 15. Problem
      12
      The sequence of ionic mobility in aqueous solution is
      a.
      b.
      c.
      d.
    • 16. Problem
      13
      If uncertainty in position & momentum are equal, then uncertainty in velocity is
      a.
      b.
      c.
      d.
    • 17. Problem
      14
      How many stereoisomer’s does this molecule have?
      CH3CH=CHCH2CHBrCH3
      8
      2
      4
      6
    • 18. Problem
      15
      On the basis of the following values, the shortest oxidizing agent is
      a.
      b.
      c.
      d.
    • 19. Problem
      16
      The correct order of decreasing second ionization enthalpy of Ti (22), V (23), Cr
      (24) & Mn (25) is
      Mn > Cr> Ti>V
      Ti > V > Cr > Mn
      Cr > Mn > V > Ti
      V > Mn > Cr > Ti
    • 20. Problem
      17
      Which one of the following is most reactive towards electrophilic attack ?
      a.
      b.
      c.
      d.
    • 21. Problem
      18
      Four diatomic species are listed below in different sequences. Which of these presence the correct order of there increasing bond order?
      a.
      b.
      c.
      d.
    • 22. Problem
      19
      How many moles of lead (II) chloride will be formed from a reaction between 6.5g of PbO & 3.2b HCl ?
      0.011
      0.029
      0.044
      0.333
    • 23. Problem
      20
      The stability of carbanions in the followings is in the order of
      (i) RC = C
      (ii) R2C = CH
      (iii)
      (iv) R3C - CH2
      (iv)> (ii)>(iii)>(i)
      >(iii) > (ii)> (iv)
      > (ii)> (iii) >(iv)
      (ii)> (iii) >(iv)> (i)
    • 24. Problem
      21
       Acetophenone when reacted with a base, , yields stable compound which has the structure
      a.
      b.
      c.
      d.
    • 25. Problem
      22
      Volume occupied by 1 molecule of water (density= 1g ) is
      a.
      b.
      c.
      d.
    • 26. Problem
      23
      Bond dissociation enthalpy of are 434,242 & 431 respectably. Enthalpy of formation HCl is
      a.
      b.
      c.
      d.
    • 27. Problem
      24
      Which of the following complexes exhibits the highest paramagnetic behavior ?
      a.
      b.
      c.
      d.
    • 28. Problem
      25
      Which one of the following statement is not true?
      Buna-S is a copolymer of butadiene & styrene.
      Natural rubber is a 1, 4-polymer of isoprene.
      In vulcanization, the formation of sulphur bridges between different chains make rubber harder & stronger.
      Natural rubber has the trans-configuration at every double bond.
    • 29. Problem
      26
      In a reaction of aniline a coloured product C was obtained
      The structure of C would be
      a.
      b.
      c.
      d.
    • 30. Problem
      27
      Which of the following condition are correct?
      a.
      b.
      c.
      d.
    • 31. Problem
      28
      The measurement of the electron position is associated with an uncertainty in momentum, which is equal to . The uncertainty in electron velocity is (mass of an electron is ).
      a.
      b.
      c.
      d.
    • 32. Problem
      29
      The angular shape of ozone molecule consists of
      a.
      b.
      c.
      d.
    • 33. Problem
      30
      Percentage of free space in a body centered cubic units cell is
      34%
      28%
      30%
      32%
    • 34. Problem
      31
      The value of equilibrium constant of the reaction
      Is 8.0. the equilibrium constant of the reaction will be
      16
      1/8
      1/16
      1/64
    • 35. Problem
      32
      The values of Kp1 & Kp2 for the reaction
      Are in the ratio 9:1. If degree of dissociation of X & A be equal, the total pressure at equilibrium (i) & (ii) are in the ratio
      36:1
      1:1
      3:1
      1:9
    • 36. Problem
      33
      Are in the ratio 9:1. If degree of dissociation of X & A be equal, the total pressure at equilibrium (i) & (ii) are in the ratio
      36:1
      1:1
      3:1
      1:9
    • 37. Problem
      34
      Which of the following is an amine hormone?
      Insulin
      Progesterone
      Thyroxine
      Oxypurin
    • 38. Problem
      35
      Kohilrausch’s laws states that at
      Infinity dilution, each ion makes definite contribution to conductance of an electrolyte what ever be the nature of the other ion of the electrolyte.
      Infinity dilution, each ion makes definite contribution to equivalent conductance of an electrolyte what ever be the nature of the other ion of the electrolyte.
      Finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte what ever be the nature of the other ion of the electrolyte.
      Infinity dilution, each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte.
    • 39. Problem
      36
      Green chemistry means such reaction which
      Are related to the depletion of ozone layer
      Study the reaction in plants
      Produce colour during reactions
      Reduce the use and production of hazardous chemicals
    • 40. Problem
      37
      Which of the following question is not correct?
      The number of carbon atoms in a unit cell of diamond is 4.
      The number of bravaislattics in which a crystal can be categorize is 14
      The fraction of the total volume occupied by the atoms in a primitive cell is 0.48
      Molecular solids are generally volatile.
    • 41. Problem
      38
      In a substitution reaction of the type
      Which one of the following has the highest relative rate?
      a.
      b.
      c.
      d.
    • 42. Problem
      39
      The correct order of increasing bond angle in the following triatomic species is
      a.
      b.
      c.
      d.
    • 43. Problem
      40
      With which one of the following elements silicon should be doped so as to give p-type of semiconductor ?
      Selenium
      Boron
      Germanium
      Arsenic
    • 44. Problem
      41
      A (predominantly) is
      a.
      b.
      c.
      d.
    • 45. Problem
      42
       An organic compound contains C, H & O. its elemental analysis gave C, 38.71% & H, 9.67%. The empirical formula of the compound would be
      a.CHO
      b.
      c.
      d.
    • 46. Problem
      43
      In which of the following coordination entities the magnitude of (CFSE is octahedral field) will be maximum?
      a.
      b.
      c.
      d.
    • 47. Problem
      44
      The alkali metals from salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?
      NaH > LiH >KH > RbH > CsH
      LiH > NaH > KH > RbH > CsH
      CsH > RbH > KH > NaH > LiH
      KH > NaH > LiH > CsH > RbH
    • 48. Problem
      45
      Which of the following are not state function?
      (i)q+w (ii)q (iii)w (iv)H-TS
      i), (ii) & (iii)
      & (iii)
      & (vi)
      (ii), (iii) & (vi)
    • 49. Problem
      46
      In the hydrocarbon,
      The state of hybridization of carbon 1, 3 & 5 are in the following sequence
      a.
      b.
      c.
      d.
    • 50. Problem
      47
      Number of moles of required to oxidize one mole of ferrous oxalate completely in acidic medium will be
      7.5moles
      0.2 moles
      0.6 moles
      0.4 moles
    • 51. Problem
      48
      The rate constants for two different reactions are , respectively. The temperature at which is
      2000 K
      1000/2.303K
      1000K
      2000/2.303K
    • 52. Problem
      49
      A strong base can abstract an α-hydrogen from
      Keton
      Alkane
      Alkene
      Amine
    • 53. Problem
      50
      Standard free energies of formation (in kJ/mol) at 298K are -237.2, -394.4 & -8.2 for respectively. The value of for the pentane – oxygen fuel cell is
      1.0968 V
      0.0968V
      1.968V
      2.0968V
    • 54. For solution visit www.vasista.net

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