AIPMT Chemistry 1997

aipmt–Past papers CHEMISTRY- UNSOLVED PAPER - 1997

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 N2 and O2 are converted into monocations, N and O respectively. Which is wrong? In O2paramagnetism decreases N becomes diamagnetic In , the N-N bond weakens In O2, the O-O bond order increases.

Problem 02 A physician wishes to prepare a buffer solution at pH = 3.85 that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use? 2, 5-dihydroxy benzoic acid (pka = 2.97) acetoacetic acid (pka = 3.58) m-chlorobenzoic acid (pka = 3.98) p-chlorocinnamic acid (pka = 4.41).

Problem 03 Haemoglobin is A vitamin A carbohydrate An enzyme A globular protein

Problem 04 Replacement of Cl of chloro-benzene to give phenol requires drastic conditions. But chlorine of 2, 4-dinitro-chloro-benzene is readily replaced NO2 denotes e- at meta position NO2 withdraws e- from ortho/para positions NO2 make ring electron rich at ortho & para NO2 withdraws e- from meta position.

Problem 05 The alkyl halide is converted into a alcohol by Elimination Dehydrohalogenation Addition Substitution.

Problem 06 Which of the following does not represent the correct order of the property indicated? Mn2+ > Ni2+ < Co2+ < Fe2+ Fe2+ > Co2+ > Ni2+ > Cu2+ Ni2+ > Cr2+ > Fe2+ > Mn2+ Se > Ti > Cr > Mn.

Problem 07 The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is Face-centred cube Simple cube Body-centred cube None of these

Problem 08 Carbon –14 dating method is based on the fact that Ratio of carbon –14 and carbon –12 is constant Carbon –14 is the same in all objects Carbon –14 is highly insoluble All of these.

Problem 09 The molar conductances of NaCl, HCl and CH3COONa at inifinite dilution are 126.45, 426.16 and 91 ohm-1 cm2 mol-1 respectively. The molar conductance of CH3COOH at infinite dilution is 698.28 ohm-1 cm2 mol-1 540.48 ohm-1 cm2 mol-1 201.28 ohm-1 cm2 mol-1 390.71 ohm-1 cm2 mol-1

Problem 10 Which of the following technique is most suitable for purification of cyclohexanone from a mixture containing benzoic acid, isoamyl alcohol. Cyclohexane and cyclohexanone? Sublimation Evaporation Crystallisation 1R spectroscopy.

Problem 11 In graphite, electrons are Localized on each C-atom Localized on every third C-atom Spread out between the structure Present in anti-bonding orbital

Problem 12 92U235 + n -> fission product + neutron + 3.20 x 10-11 J. The energy undergoes fission is 8.21 x 107 J 6.55 x 106 J 12.75 x 108 J 18.60 x 109 J

Problem 13 The lanthanide contraction is responsible for the fact that Zr and Hf have about the same radius Zr and Zn have the same oxidation state Zr and Y have about the same radius. Zr and Nb have similar oxidation state.

Problem 14 For the reaction the rate of reaction is expressed as a. b. c. d. None of these.

Problem 15 For two ionic solids CaO and KI, identify the wrong statement among the following CaO has high melting point Lattice energy of CaO is much larger than that of KI KI has high melting point Ki is soluble in benzene.

Problem 16 The function of enzymes in the living system is to Catalyse biochemical reactions Provide energy Transport oxygen Provide immunity.

Problem 17 Which of the following is redox reaction? Evaporation of H2O Both oxidation and reduction H2SO4 with NaOH In atmosphere O3 from O2 by lighting .

Problem 18 Which of the following reaction is expected to readily give a hydrocarbon product in good yields? CH3CH3 b. (CH3)2CCl c. RCOOK d. RCOO Ag .

Problem 19 Among the following compounds (I - III) the correct reaction with electrophillic is I > II > III I = II > III II > III > I III < I < II.

Problem 20 E0 for the cell, Zn | Zn2+ (aq) || Cu2+ (aq) | Cu 1.10 V at 250C, the equilibrium constant for the reaction is the order of 10+18 10+17 10-28 10-37.

Problem 21 The compound obtained by heating a mixture of ethyl amine and chloroform with ethanolic potassium hydroxide (KOH) is An amide An amide an nitro compound An ethyl isocyanide An alkyl halide.

Problem 22 The hydride ion H- is stronger base than its hydroxide ion OH-. Which of the following reaction will occur if sodium hydride (NaH) is dissolved in water? H- + H2O -> no reaction H- (aq) + H2O -> H2O H-(aq) + H2O(l) -> OH- + H2 None of these

Problem 23 In a reaction CH2 = CH2 CH2OHWhere M = Molecule and R = Reagent. M and R are CH2OH CH4CH2OH and HCl CH2-CH2 and heat CH3CH2Cl and NaOH CH2Cl-CH2OH and aq. NaHCO3.

Problem 24 Which of the following can possibly be used as analgesic without causing addiction and moon modification? Drazepom tetrahydrocatinol morphine N-acetyl-para-aminophenol.

Problem 25 Which of the following 0.10 m aqueous solution will have the lowest freezing point? KI C12H22O11 Al2(SO4)3 C5H10O5.

Problem 26 Which of the following element is responsible for oxidation of water to O2 in biological processes? Cu Mo Fe Mn.

Problem 27 N2 and O2 are converted into monoanions N and O respectively, which of the following statements is wrong? In O2, bond length increases N becomes diamagnetic In N2, the N-N bond weakens In O2, the O-O bond order increases.

Problem 28 The ability of anion, to bring about coagulation of a given colloid, depends upon Magnitude of the charge Both magnitude and charge Its charge only Sing of the charge alone

Problem 29 Which of the following has the highest dipole moment? SbH3 AsH3 NH3 PH3.

Problem 30 The solubility product of CuS, Ag2S and HgS are 10-31, 10-44, 10-54 respectively. The solubilities of these sullphides are in the order HCuS > Ag2S > HgS Ag2S > CuS > HgS AgS > gS > Ag2S > CuS HgS > CuS.

Problem 31 The electronic configuration of gadolinium (Atomic No.64) is [Xe] 4f3 5d5 6s2 [Xe] 4f6 5d2 6d2 [Xe] 4f8 5d9 6s2 [Xe] 4f7 5d1 6s2.

32 Problem The cylindrical shape of an alkyne is due to Two sigma C – C and one π C - C bonds One sigma C – C and two π C – C bonds Three sigma C – C bonds Three π C – C bonds.

Problem 33 The formula of dichlorobis (urea) copper (II) is [Cu {O = C (NH2)2}Cl]Cl [CuCl2]{O = C (NH2}2 [Cu {O = C(NH2)2}Cl2 [CuCl2 {O = C(NH2)2}2].

Problem 34 The volume strength of 1.5 N H2O2 solution is 8.8 8.4 4.8 5.2

Problem 35 The number of geometrical isomers of the complex [Co(NO2)3(NH3)3] is 4 0 2 3

Problem 36 At 250C, the highest osmotic pressure is exhibited by 0.1 M solution of Glucose Urea CaCl2 KCl.

Problem 37 Ketones Where R = R1 = alkyl group.It can be obtained in one step by Oxidation of tertiary alcohol Reaction of acid halide with alcohols Hydrolysis of esters Oxidation of primary alcohol.

Problem 38 In the commercial gasolines, the type of hydrocarbons which are more desirable is Linear unsaturated hydrocarbon Toluene Branched hydrocarbon Straight –chain hydrocarbon.

Problem 39 The experimental data for the reaction 2A + B2 -> 2AB is Experiment [A] [B2] Rate (mole s-1) 1 0.50 0.50 1.6 x 10-4 2 0.50 1.00 3.2 x 10-4 3 1.00 1.00 3.2 x 10-4 the rate equation for the above data is rate = k [A]2[B]2 rate = k [A]2[B] rate = k [B2] rate = k [B2]2

Problem 40 The most stable conformation of n-butane is Gauche Staggered Skew boat Eclipsed.

Problem 41 The high density of water compared to ice is due to Dipole-induced dipole interactions Induced dipole induced dipole interactions Hydrogen bonding interactions Dipole –dipole interactions.

Problem 42 Given that C + O2 -> CO2, The enthalpy of formation of carbon monoxide will be a. b. c. d.

Problem 43 Which one of the following is correct order of the size of iodine species? I+ > I- > I I-> I > I+ I > I- > I+ I > I+ > I-.

Problem 44 Which one of the following is used to make ‘non-stick’ cookware? Poly-ethylene terephthalate Polytetrafluoroethylenc PVC Polystyrene.

Problem 45 Phenylmethanol can be prepared by reducing the benzaldehyde with CH3Br and Na CH3I and Mg CH3Br Zn and HCl.

Problem 46 The structural formula of hypophosphorus acid is a. b. c. d.

Problem 47 The following reaction is described as SN2 SN0 SE2 SN1.

Problem 48 The ion that is isoelectronic with CO is CN- N O2- N

Problem 49 K2Cr2O7 on heating with aqueous NaOH gives Cr2O72- Cr(OH)2 CrO42- Cr(OH)3.

Problem 50 Tautomerism is exhibited by R3CNO2 RCH2NO2 (CH3)3CNO (CH3)2NH.

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AIPMT Chemistry 1997

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AIPMT Chemistry 1997