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  • 1. aipmt–Past papers
    CHEMISTRY- UNSOLVED PAPER - 1994
  • 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 statements is not true?
    Ampicillin is a natural antibiotic
    Aspirin is both analgesic and antipyretic
    Sulphadiazine is a synthetic antibacterial drug
    Some disinfectants can be used as antiseptics.
  • 4. Problem
    02
    Which one of the following order is wrong, with respect to the property indicated?
    Benzoic acid > phenol > cyclohexanol (acid strength )
    Aniline > cyclohexylamine > benzamide (basic strength )
    Formic acid > acetic acid > propanoic acid (acid strength )
    Fluroacetic acid > chloroacetic acid > bromoacetic acid (acid strength ).
  • 5. Problem
    03
    Compound A has a molecular formula C2Cl3OH. It reduces Fehling’s solution and on oxidation, it gives a monocarboxylic acid B. If A is obtained by the action of chlorine on ethyl alcohol, then compound A is
    Methyl chloride
    Monochloro acetic acid
    Chloral
    Chloroform.
  • 6. Problem
    04
    An acyl halide is formed when PCl5 reacts with an
    Amide
    Ester
    Acid
    Alcohol.
  • 7. Problem
    05
    Which of the following compound will undergo self aldol condensation in the presence of cold dilute alkali? 
    CH C – CHO
    CH2 = CH – CHO
    C6H6CHO
    CH3CH2CHO.
  • 8. Problem
    06
    Diazo – coupling is useful to prepare some
    Dyes
    Vitamins
    Pesticides
    Proteins.
  • 9. Problem
    07
    On heating glycerol with conc. H2SO4, a compound is obtained which has bad odour. The compound is  
    Acrolein
    Formic acid
    Allyl alcohol
    Glycerol sulphate.
  • 10. Problem
    08
    The most suitable method of the separation of a 1 : 1 mixture of ortho-and para-nitrophenols is  
    Crystallization
    Chromatography
    Distillation
    Sublimation.
  • 11. Problem
    09
    Which of the following compounds will give positive test with Tollen’s reagent? 
    Acetic acid
    Acetone
    Acetamide
    Acetaldehyde.
  • 12. Problem
    10
    By the action of enzymes, the rate of biochemical reaction
    Does not change
    Increases
    Decreases
    Either (a) or (c).
  • 13. Problem
    11
    Reaction of t-butyl bromide with sodium methoxide produces
    Sodium t-butoxide
    t-butyl methyl ether
    isobutene
    Isobutylene.
  • 14. Problem
    12
    The reactive species in the nitration of benzene is
    NO3
    NHO3
    NO
    NO
  • 15. Problem
    13
    Grignard reagent is prepared by the reaction between 
    Magnesium and alkane
    Magnesium and aromatic hydrocarbon
    Zinc and alkyl halide
    Magnesium and alkyl halide.
  • 16. Problem
    14
    Which of the following statement concerning lanthanides elements is false? 
    All lanthanides are highly dense metals
    More characteristic oxidation state of lanthanides elements is +3
    Lanthanides are separated from one another by ion exchange method
    ionic radii of trivalent lanthanides steadily increases with increase in the atomic number.
  • 17. Problem
    15
    The action of nitrous acid on an aliphatic primary amine, gives
     
    Secondary amine
    Nitro alkane
    Alcohol
    Alkyl nitrite.
  • 18. Problem
    16
    One of the following which does not observe the anti-Markownikoff’s addition of HBr, is  
    Pent-2-ene
    Propene
    But-2-ene
    But-1-ene.
  • 19. Problem
    17
    The compound which does not react with sodium, is
    CH3COOH
    CH3-CHOH-CH3
    C2H5OH
    CH3-O-CH3.
  • 20. Problem
    18
    Which of the following ligands is expected to bidentate? 
    CH3NH2
    CH3C N
    Br
    C2O
  • 21. Problem
    19
    Method used for obtaining highly pure silicon, used as a semiconductor material, is  
    Crystallization
    Zone refining
    Oxidation
    Electro-chemical.
  • 22. Problem
    20
    Which one of the following statements is not correct?
    Mercury (II) iodide dissolves in excess of potassium iodide solution
    Tin (IV) chloride is made by dissolving tin solution in concentrated hydrochloric acid
    Zinc dissolves in sodium hydroxides solution
    Carbon monoxide reduces iron (III) oxide to iron.
  • 23. Problem
    21
    Carbon and silicon belong to (IV) group. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6, This is due to  
    Availability of low lying Assertion (A) :- orbitals in silicon
    Large size of silicon
    More electropositive nature of silicon
    Both (b) and (c).
  • 24. Problem
    22
    Which of the following transition element shows the highest oxidation state?
    V
    Cr
    Mn
    Fe.
  • 25. Problem
    23
    Which of the following oxides of nitrogen is paramagnetic ? 
    NO2
    N2O3
    N2O
    N2O5.
  • 26. Problem
    24
    To protect iron against corrosion, the most durable metal plating on it, is
    Copper plating
    Zinc plating
    Nickel plating
    Tin plating.
  • 27. Problem
    25
    Which of the following statements about H3BO3 is not correct ?
    It has a layer structure in which planar BO3 units are joined by hydrogen bonds
    It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ion
    It is a strong tribasic acid
    It is prepared by acidifying an aqueous solution of borax.
  • 28. Problem
    26
    Which of the following displaces Br2 from an aqueous solution containing bromide ions?
    I2
    I
    Cl2
    Cl-.
  • 29. Problem
    27
    Ionic solids, with Scotty defects, contain in their structure
    Cation vacancies only
    Cation vacancies and interstitial cations
    Equal number of cation and anion vacancies
    Anion vacancies and interstitial anions.
  • 30. Problem
    28
    Which pair of substances gives same gaseous product, when these react with water?
    K and KO2
    Ba and BaO2
    Ca and CaH2
    Na and Na2O2.
  • 31. Problem
    29
    Which of the following salt has the same value of vant’s Hoff factor I as that of K3[Fe(CN)6]?
    Na2SO4
    Al(NO3)3
    Al2(SO4)3
    NaCl
  • 32. Problem
    30
    Standard reduction potentials at 250C of Li+|Li,Ba2+|Ba, Na+|Na and Mg2+|Mg are – 3.05, -2.90,-2.71 and –2.37 volt respectively. Which one of the following is the strongest oxidizing agent? 
    Ba2+
    Mg2+
    Na+
    Li+.
  • 33. Problem
    31
    The data for the reaction A + B -> C, is
    Exp. [A]0 [B]0 Initial rate
    1 0.012 0.035 0.10
    2 0.024 0.070 0.80
    3 0.024 0.035 0.10
    4 0.012 0.070 0.80
    the rate law corresponds to the above data is  
    rate = k[A][B]3
    rate = k [A]2[B]2
    rate = k[B]3
    rate = k[B]4
  • 34. Problem
    32
    Which one of the following is not is electronic with O2-?
    TT+
    Na+
    N3-
    F-.
  • 35. Problem
    33
    For the adsorption of a gas on a solid, the plot of log (x/m) versus log P is linear with slope equal to
    n
    1/n
    k
    log k.
  • 36. Problem
    34
    Which of the following molecules has the highest bond order?
    O2-
    O2
    O2+
    O22-
  • 37. Problem
    35
    Following reaction occurring in an automobile The sign of H, S and G would be
    -. +, +
    + , + , -
    +, - , +
    -, +, -.
  • 38. Problem
    36
    At 250C, the highest osmotic pressure is exhibited by 0.1 M solution of
    Glucose
    Urea
    CaCl2
    KCl.
  • 39. Problem
    37
    How many grams of CH3OH should be added to water to prepare 150 ml solution of 2 M CH3OH ? 
    9.6 X 103
    2.4 X 103
    9.6
    2.4.
  • 40. Problem
    38
    Which substance is serving as a reducing agent in the following reaction ? 
    H+
    H2O
    Ni.
    Cr2O2-7
  • 41. Problem
    39
    Which of the following molecule does not possess a permanent dipole moment?
    CS2
    SO3
    H2S
    SO2.
  • 42. Problem
    40
    50 ml of hydrogen diffuses out through a small hole of a vessel, in 20 minutes. The time taken by 40 ml of oxygen to diffuse out is
    32 minutes
    64 minutes
    8 minutes
    12 minutes.
  • 43. Problem
    41
    The formula for calcium chlorite is
    CaClO2
    Ca(ClO2)2
    Ca(ClO4)2
    Ca(ClO3)2.
  • 44. Problem
    42
    In a radioactive decay, an emitted electron comes from 
    Outermost orbit of the atom
    Orbit having principal quantum number one
    Nucleus of the atom
    Inner orbital of the atom.
  • 45. Problem
    43
    The number of atoms is 100 g of an FCC crystal with density Assertion (A) : = 10 g/cm3 and cell edge equal to 100 pm, is equal to
    2 x 1025
    1 x 1025
    4 x 1025
    3 x 1025.
  • 46. Problem
    44
    Which one of the following is most soluble?
    Bi2S3 (Ksp = 1 x 10-70)
    Ag2S (Ksp = 6 x 10-51)
    Cus (Ksp = 8 x 10-37)
    MnS(Ksp = 7 x 10-16)
  • 47. Problem
    45
    The temperature of a gas is raised from 270C to 9270C. The root mean square speed of the gas  
    Remains same
    Gets times
    Gets halved
    Gets doubled.
  • 48. Problem
    46
    For which of the following sets of four quantum numbers, an electron will have the highest energy ? 
    n l m s
    3 2 1 +1/2
    4 2 -1 +1/2
    4 1 0 -1/2
    5 0 0 -1/2.
  • 49. Problem
    47
    The oxidation state of 1 in H4IO6- is
    + 1
    -1
    + 7
    + 5.
  • 50. Problem
    48
    The table shown below gives the bond dissociation energies (Ediss) for single covalent bonds of carbon (C) atoms with element A, B, C and D. which element has the smallest atoms?  
    C
    D.
    A
    B
  • 51. Problem
    49
    At 800C, distilled water has [H3O+] concentration equal to 1 x 10-6 mole/litre. The value of Kwat this temperature will be  
    1 x 10-12
    1 x 10-15
    1 x 10-6
    1 x 10-9
  • 52. Problem
    50
    The total number of valence electrons in 4.2 gm of N ion is ( is the Avogadro’s number ) 
    2.1
    4.2
    1.6
    3.2
  • 53. For solution visit www.vasista.net