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AFMC Chemistry  1999
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AFMC Chemistry 1999

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    AFMC Chemistry  1999 AFMC Chemistry 1999 Presentation Transcript

    • AFMC–Past papers
      CHEMISTRY - UNSOLVED PAPER - 1999
    • 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
    • 01
      Problem
      The reaction CH2 = CHCH3 + HBr -> CH3CHBrCH3, is a type of
      Free radical addition reaction
      Electrophilic substitution reaction
      Electrophilic addition reaction
      Nucleophilic addition reaction
    • Problem
      02
      Which of the following set has the strongest tendency to form anions?
      Ga, In and T
      Na, Mg and A1
      N, O and F
      V, Cr and Mn
    • Problem
      03
      Baeyer's reagent is used in the laboratory for
      Oxidation process
      Detection of glucose
      Detection of double bond
      Reduction process
    • Problem
      04
      Oxidation of acetaldehyde with selenium dioxide produces
      Glyoxal
      Oxalic acid
      Ethanoic acid
      Methanoic acid
    • Problem
      05
      Which of the following is the most stable oxidation state of aluminium?
      +2
      +1
      -1
      +3
    • Problem
      06
      When acetylene reacts with arsenic trichloride in the presence of anhydrous aluminium chloride, it produces
      Nitrobenzene
      P-chlorovinyidichloroarsinc
      Lewisite
      Both (b) and (c)
    • Problem
      07
      Emery consists of
      Purest form of iron
      Impure corundum
      Impure carborundum
      Impure graphite
    • Problem
      08
      Which of the following is the monomer of natural rubber?
      Isoprene
      Adipic acid
      Glycol
      Ethylene
    • Problem
      09
      The structure of DNA is
      Triple helix
      Linear
      Single helix
      Double helix
    • Problem
      10
      Which of the following statements is true for fuel cells?
      They are free from pollution
      They run till the reactant are active
      They are more efficient
      All of these
    • Problem
      11
      Chloroform on treatment with concentrated HN03 , gives
      CHCl2NO3
      CHCIHNO3
      CHC12NO2
      CC13NO2
    • Problem
      12
      Which of the following will not displace hydrogen?
      Ba
      Pb
      Sn
      Hg
    • Problem
      13
      When primary alcohol is oxidised with chlorine, it gives
      HCHO
      CH3CHO
      CC13CHO
      C3H7CHO
    • Problem
      14
      The Beilstein test for organic compounds is used to detect
      Carbon
      Halogens
      Nitrogen
      Sulphur
    • Problem
      15
      In the reaction HN03 + P4O10 4HPO3 + X, the product X is
      N2O5
      H2O
      NO2
      N2O3
    • Problem
      16
      The oxidation of toluene to benzaldehyde by chromyl chloride is called
      Etard reaction
      Fittig reaction
      Rosenmund reaction
      Wurtz reaction
    • Problem
      17
      Which of the following halogen is solid at room temperature?
      Iodine
      Bromine
      Fluorine
      Chlorine
    • Problem
      18
      Heating a mixture of sodium benzoate and soda lime gives
      Benzene
      Calcium benzoate
      Methane
      Sodium benzoate
    • Problem
      19
      Nylon-66 is made by using
      Adipic acid
      Succinic acid
      Phenol
      Benzaldehyde
    • Problem
      20
      Half-life of radium is 1580 years, its average life will be
      2.5 x 103 years
      2.275 x 103 years
      8.25 x 102 years
      1.8 x 103 years
    • Problem
      21
      Nessler's reagent is represented by
      K2[HgI4]
      HgOHgI2
      K2[HgI2]
      Hgl2
    • Problem
      22
      Which of the following has the highest boiling point?
      n-octane
      Butane
      Pentane
      Ethane
    • Problem
      23
      Which of the following is the most electronegative?
      Co
      Cu
      Ni
      Fe
    • Problem
      24
      The half-life of 6C14 if its decay constant (λ) is 2.31 x 10-4 is
      3.5 x 104 year
      3 x 103 year
      2 x 102 year
      4 x 103 year.
    • Problem
      25
      The de-Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is
      6.63 x 10-33 m
      6.63 x 10-34 m
      6.63 x 10-35 m
      6.65 x 10-35 m.
    • Problem
      26
      How many gram of dibasic acid (molecular weight = 200) should be present in 100 ml of the aqueous solution to give strength 0.1 N?
      2g
      1g
      5g
      10g
    • Problem
      27
      Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in its 35 g. Molecular mass of anthracite is {Kb for CHC13 = 3.9 K-kg mol-1)
      132.32 g/mol
      242.32 g/mol
      177.42 g/mol
      79.42 g/mol
    • Problem
      28
      The oxidation state of chromium in potassium dichromate (K2Cr2O7) is
      +2
      -2
      -5
      +6
    • Problem
      29
      The compound containing co-ordinate "bond is
      SO3
      H2SO4
      O3
      All of these
    • Problem
      30
      The correct order of reactivity of halogen is
      F > CI > Br > I
      F < CI < Br < I
      F < CI > Br > I
      F > CI < Br < I
    • Problem
      31
      Ratio of the energy of a photon of wavelengths 3000 A and 6000 A is
      1 : 2
      1 : 3
      3 : 1
      2 : 1
    • Problem
      32
      In the manufacture of NH3, the most favorable condition is
      Low temperature and high pressure
      High temperature and low pressure
      High temperature and high pressure
      High temperature and low pressure
    • Problem
      33
      The molecular formula of crinoline is
      Na3AlF6
      Na2Al2O3
      Fe3O4
      All of these
    • Problem
      34
      Calcium format, on dry heating, yields
      Acetic acid
      Acetaldehyde
      Acetone
      Formaldehyde
    • Problem
      35
      Carnalite has which of the following composition?
      Fe3O4
      Na3AlF6
      KCl-MgCl2-6H2O
      Na2AlF5
    • Problem
      36
      The acid formed, when iodine reacts with concentrated nitric acid, is
      Iodic acid
      Nitrous acid
      Hydroiodic acid
      Per-iodic acid
    • Problem
      37
      Magnetic quantum number specifies
      Size of orbitals
      Shape of orbital
      Nuclear stability
      Orientation of orbitals
    • Problem
      38
      According to Bohr's theory of hydrogen atom, which of the following is quantised for an electron?
      Acceleration
      Velocity
      Angular momentum
      Angular acceleration
    • Problem
      39
      The volume of a gas measured at 27°C and 1 atm pressure is 10 litres. What final temperature would be required to reduce the volume to 5 litres at 1 atm pressure?
      450 K
      100°C
      150 K
      327 K
    • Problem
      40
      The number of electrons in [19K40]-1 is
      18
      19
      20 
      40
    • Problem
      41
      Aufbau principle is obeyed in which of the following electronic configurations?
      Is2 2s22p6
      Is2 3p6 3s2
      1s2 3s23p6 
      Is2 2s2 3s2
    • Problem
      42
      Which of the following substances is used, in laboratory, for fast drying of neutral gases?
      Phosphorus pent oxide
      Anhydrous calcium chloride
      Active charcoal
      Sodium phosphate
    • Problem
      43
      In which of the following hydrocarbons, hydrogen is most acidic?
      CH2 = CH2
      CH = CH
      CH3 - CH3
      None of these
    • Problem
      44
      Tyndall effect can be observed in a
      Solvent
      Precipitate
      Colloidal solution
      Solution
    • Problem
      45
      A base, as defined by Bronzed theory, is a substance which can
      Gain a pair of electrons
      Accept protons
      Lose a pair of electrons
      Donate protons
    • Problem
      46
      In the preparation of sulphuric acid, V205 is used in the reaction. It is
      N2 + 3H2-> 2NH3
      2SO2 + O2 -> 2SO3
      SO2 + H2O ->H2SO4
      S + O2 ->S02
    • Problem
      47
      Empirical formula of a compound is CH2O. If its molecular weight is 180, then the molecular formula of the compound is
      C3H6O3
      C4H8O4
      C6H12O
      C5H10O5.
    • Problem
      48
      The compound CH3 – O-C3H7 and C2H5 - O - C2H5 exhibit
      Mesmerism
      Chain isomerism
      Optical isomerism
      Cis-trans isomerism
    • Problem
      49
      Solutions with same osmotic pressure are called
      Isotonic
      Hypertonic
      Normal
      None of these
    • Problem
      50
      pH value of a solution, whose hydronium ion concentration is 6.2 x 10-9 mol/1 is
      7.75
      7.21
      8.21
      6.21
    • For solution visit www.vasista.net