AIPMTChemistry 1994


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  • AIPMTChemistry 1994

    1. 1. aipmt–Past papers<br />CHEMISTRY- UNSOLVED PAPER - 1994<br />
    2. 2. SECTION – I (Total Marks : 50)<br />Single Correct Answer Type<br />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<br />
    3. 3. 01<br />Problem<br />Which one of the following statements is not true?<br />Ampicillin is a natural antibiotic <br />Aspirin is both analgesic and antipyretic <br />Sulphadiazine is a synthetic antibacterial drug<br />Some disinfectants can be used as antiseptics. <br />
    4. 4. Problem<br />02<br />Which one of the following order is wrong, with respect to the property indicated?<br />Benzoic acid > phenol > cyclohexanol (acid strength )<br />Aniline > cyclohexylamine > benzamide (basic strength )<br />Formic acid > acetic acid > propanoic acid (acid strength )<br />Fluroacetic acid > chloroacetic acid > bromoacetic acid (acid strength ).<br />
    5. 5. Problem<br />03<br />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<br />Methyl chloride <br />Monochloro acetic acid <br />Chloral <br />Chloroform.<br />
    6. 6. Problem<br />04<br />An acyl halide is formed when PCl5 reacts with an<br />Amide<br />Ester<br />Acid <br />Alcohol.<br />
    7. 7. Problem<br />05<br />Which of the following compound will undergo self aldol condensation in the presence of cold dilute alkali? <br />CH C – CHO<br />CH2 = CH – CHO<br />C6H6CHO<br />CH3CH2CHO.<br />
    8. 8. Problem<br />06<br />Diazo – coupling is useful to prepare some<br />Dyes<br />Vitamins<br />Pesticides<br />Proteins. <br />
    9. 9. Problem<br />07<br />On heating glycerol with conc. H2SO4, a compound is obtained which has bad odour. The compound is  <br />Acrolein<br />Formic acid<br />Allyl alcohol<br />Glycerol sulphate.<br />
    10. 10. Problem<br />08<br />The most suitable method of the separation of a 1 : 1 mixture of ortho-and para-nitrophenols is  <br />Crystallization <br />Chromatography <br />Distillation <br />Sublimation. <br />
    11. 11. Problem<br />09<br />Which of the following compounds will give positive test with Tollen’s reagent? <br />Acetic acid <br />Acetone<br />Acetamide<br />Acetaldehyde.<br />
    12. 12. Problem<br />10<br />By the action of enzymes, the rate of biochemical reaction<br />Does not change<br />Increases<br />Decreases<br />Either (a) or (c).<br />
    13. 13. Problem<br />11<br />Reaction of t-butyl bromide with sodium methoxide produces<br />Sodium t-butoxide<br />t-butyl methyl ether <br />isobutene<br />Isobutylene.<br />
    14. 14. Problem<br />12<br />The reactive species in the nitration of benzene is<br />NO3<br />NHO3<br />NO <br />NO <br />
    15. 15. Problem<br />13<br />Grignard reagent is prepared by the reaction between <br />Magnesium and alkane<br />Magnesium and aromatic hydrocarbon <br />Zinc and alkyl halide<br />Magnesium and alkyl halide.<br />
    16. 16. Problem<br />14<br />Which of the following statement concerning lanthanides elements is false? <br />All lanthanides are highly dense metals <br />More characteristic oxidation state of lanthanides elements is +3<br />Lanthanides are separated from one another by ion exchange method<br /> ionic radii of trivalent lanthanides steadily increases with increase in the atomic number. <br />
    17. 17. Problem<br />15<br />The action of nitrous acid on an aliphatic primary amine, gives<br /> <br />Secondary amine<br />Nitro alkane<br />Alcohol<br />Alkyl nitrite. <br />
    18. 18. Problem<br />16<br />One of the following which does not observe the anti-Markownikoff’s addition of HBr, is  <br />Pent-2-ene<br />Propene<br />But-2-ene<br />But-1-ene.<br />
    19. 19. Problem<br />17<br />The compound which does not react with sodium, is<br />CH3COOH<br />CH3-CHOH-CH3<br />C2H5OH<br />CH3-O-CH3. <br />
    20. 20. Problem<br />18<br />Which of the following ligands is expected to bidentate? <br />CH3NH2<br />CH3C N<br />Br<br />C2O <br />
    21. 21. Problem<br />19<br />Method used for obtaining highly pure silicon, used as a semiconductor material, is  <br />Crystallization <br />Zone refining <br />Oxidation <br />Electro-chemical.<br />
    22. 22. Problem<br />20<br />Which one of the following statements is not correct?<br />Mercury (II) iodide dissolves in excess of potassium iodide solution <br />Tin (IV) chloride is made by dissolving tin solution in concentrated hydrochloric acid <br />Zinc dissolves in sodium hydroxides solution <br />Carbon monoxide reduces iron (III) oxide to iron.<br />
    23. 23. Problem<br />21<br />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  <br />Availability of low lying Assertion (A) :- orbitals in silicon <br />Large size of silicon <br />More electropositive nature of silicon <br />Both (b) and (c).<br />
    24. 24. Problem<br />22<br />Which of the following transition element shows the highest oxidation state?<br />V<br />Cr<br />Mn<br />Fe.<br />
    25. 25. Problem<br />23<br />Which of the following oxides of nitrogen is paramagnetic ? <br />NO2<br />N2O3<br />N2O<br />N2O5.<br />
    26. 26. Problem<br />24<br />To protect iron against corrosion, the most durable metal plating on it, is<br />Copper plating <br />Zinc plating <br />Nickel plating <br />Tin plating.<br />
    27. 27. Problem<br />25<br />Which of the following statements about H3BO3 is not correct ?<br />It has a layer structure in which planar BO3 units are joined by hydrogen bonds <br />It does not act as proton donor but acts as a Lewis acid by accepting hydroxyl ion <br />It is a strong tribasic acid <br />It is prepared by acidifying an aqueous solution of borax.<br />
    28. 28. Problem<br />26<br />Which of the following displaces Br2 from an aqueous solution containing bromide ions?<br />I2<br />I <br />Cl2<br />Cl-.<br />
    29. 29. Problem<br />27<br />Ionic solids, with Scotty defects, contain in their structure<br />Cation vacancies only<br />Cation vacancies and interstitial cations<br />Equal number of cation and anion vacancies <br />Anion vacancies and interstitial anions. <br />
    30. 30. Problem<br />28<br />Which pair of substances gives same gaseous product, when these react with water?<br />K and KO2<br />Ba and BaO2<br />Ca and CaH2<br />Na and Na2O2.<br />
    31. 31. Problem<br />29<br />Which of the following salt has the same value of vant’s Hoff factor I as that of K3[Fe(CN)6]?<br />Na2SO4<br />Al(NO3)3<br />Al2(SO4)3<br />NaCl<br />
    32. 32. Problem<br />30<br />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? <br />Ba2+<br />Mg2+<br />Na+<br />Li+.<br />
    33. 33. Problem<br />31<br />The data for the reaction A + B -> C, is <br />Exp. [A]0 [B]0 Initial rate<br />1 0.012 0.035 0.10<br />2 0.024 0.070 0.80<br />3 0.024 0.035 0.10<br />4 0.012 0.070 0.80<br />the rate law corresponds to the above data is  <br />rate = k[A][B]3<br />rate = k [A]2[B]2<br />rate = k[B]3<br />rate = k[B]4<br />
    34. 34. Problem<br />32<br />Which one of the following is not is electronic with O2-? <br />TT+<br />Na+<br />N3-<br />F-.<br />
    35. 35. Problem<br />33<br />For the adsorption of a gas on a solid, the plot of log (x/m) versus log P is linear with slope equal to<br />n<br />1/n<br />k<br />log k.<br />
    36. 36. Problem<br />34<br />Which of the following molecules has the highest bond order?<br />O2-<br />O2<br />O2+<br />O22-<br />
    37. 37. Problem<br />35<br />Following reaction occurring in an automobile The sign of H, S and G would be<br />-. +, +<br />+ , + , -<br />+, - , +<br />-, +, -.<br />
    38. 38. Problem<br />36<br />At 250C, the highest osmotic pressure is exhibited by 0.1 M solution of<br />Glucose <br />Urea<br />CaCl2<br />KCl.<br />
    39. 39. Problem<br />37<br />How many grams of CH3OH should be added to water to prepare 150 ml solution of 2 M CH3OH ? <br />9.6 X 103<br />2.4 X 103<br />9.6<br />2.4.<br />
    40. 40. Problem<br />38<br />Which substance is serving as a reducing agent in the following reaction ? <br />H+<br />H2O<br />Ni.<br />Cr2O2-7<br />
    41. 41. Problem<br />39<br />Which of the following molecule does not possess a permanent dipole moment?<br />CS2<br />SO3<br />H2S<br />SO2.<br />
    42. 42. Problem<br />40<br />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 <br />32 minutes<br />64 minutes<br />8 minutes<br />12 minutes.<br />
    43. 43. Problem<br />41<br />The formula for calcium chlorite is<br />CaClO2<br />Ca(ClO2)2<br />Ca(ClO4)2<br />Ca(ClO3)2.<br />
    44. 44. Problem<br />42<br />In a radioactive decay, an emitted electron comes from <br />Outermost orbit of the atom <br />Orbit having principal quantum number one<br />Nucleus of the atom<br />Inner orbital of the atom.<br />
    45. 45. Problem<br />43<br />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<br />2 x 1025<br />1 x 1025<br />4 x 1025<br />3 x 1025.<br />
    46. 46. Problem<br />44<br />Which one of the following is most soluble?<br />Bi2S3 (Ksp = 1 x 10-70)<br />Ag2S (Ksp = 6 x 10-51)<br />Cus (Ksp = 8 x 10-37)<br />MnS(Ksp = 7 x 10-16)<br />
    47. 47. Problem<br />45<br />The temperature of a gas is raised from 270C to 9270C. The root mean square speed of the gas  <br />Remains same <br />Gets times<br />Gets halved<br />Gets doubled.<br />
    48. 48. Problem<br />46<br />For which of the following sets of four quantum numbers, an electron will have the highest energy ? <br /> n l m s <br />3 2 1 +1/2<br />4 2 -1 +1/2<br />4 1 0 -1/2<br />5 0 0 -1/2.<br />
    49. 49. Problem<br />47<br />The oxidation state of 1 in H4IO6- is<br />+ 1<br />-1<br />+ 7<br />+ 5.<br />
    50. 50. Problem<br />48<br />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?  <br />C<br />D.<br />A<br />B<br />
    51. 51. Problem<br />49<br />At 800C, distilled water has [H3O+] concentration equal to 1 x 10-6 mole/litre. The value of Kwat this temperature will be  <br />1 x 10-12<br />1 x 10-15<br />1 x 10-6<br />1 x 10-9<br />
    52. 52. Problem<br />50<br />The total number of valence electrons in 4.2 gm of N ion is ( is the Avogadro’s number ) <br />2.1 <br />4.2 <br />1.6 <br />3.2 <br />
    53. 53. For solution visit<br />