1. UPSEEPAST PAPERSCHEMISTRY- UNSOLVED PAPER - 1998

2. SECTION I Single Correct Answer Type There are five parts in this question. Four choices are given for each part and one of them iscorrect. Indicate you choice of the correct answer for each part in your answer-book bywriting the letter (a), (b), (c) or (d) whichever is appropriate 3. 01 Problem Which one of the following does not have any unit ? a. Electron affinity b. Ionisation energy c. Electronegativity d. None of the above 4. 02 Problem The oxidation number of O in H2O2 is : a. - 2 b. - 1 c. + 1 d. + 2 5. 03 Problem The product CH3 CH = CH2 + HBr X is : CH3 CH2 CH2Br CH3 CHBr CH3 CH2Br CH = CH2 CH2 = C = CH2 6. 04 Problem German silver is a alloy of copper and : a. Zn and Ni b. Al c. Zn d. Sn 7. 05 Problem The formula of haematite is : a. Fe3O4 b. Fe2O3 c. FeCO3 d. FeS2 8. 06 Problem Which one of the following is a Lewis acid ? a. PCl3 b. AlCl3 c. NCl3 d. AsCl3 9. 07 Problem Copper sulphate solution reacts with KCN to give : a. Cu(CN)2 b. CuCN c. K4[Cu(CN)4] d. K3[Cu(CN)4] 10. 08 Problem Finely divided iron combine with Co to give : a. Fe(CO)5 b. Fe(CO)3 c. Fe(CO)18 d. Fe(CO)6 11. 09 Problem The molecule with pyramidal shape is : a. PCl3 b. SO3 c. CO32- d. NO3- 12. 10 Problem Bakelite is obtained from phenol by reacting with : a. Acetaldehyde b. Acetal c. Formaldehyde d. Chlorobenzene 13. 11 Problem The aldol condensation acetaldehyde results in the : 14. 12 Problem Benzyl alcohol is obtained from benzaldehyde by : a. Wurtz reaction b. Cannizaro reaction c. Claisen reaction d. Perkin reaction 15. 13 Problem Which of the following compounds can exist in optically active form ? a. 1-butanol b. 2-butanol c. 3-pentanol d. 4-heptanol 16. 14 Problem The oxidation number of Pt in [Pt(C2H4)Cl3]- is a. +1 b. +2 c. +3 d. +4 17. 15 Problem The IUPAC name of a. 1, 1 dimethyl-1, 3-butanediol b. 4-methyl-2, 4-pentanediol c. 2-methyl-2, 4-pentanediol d. 1, 3, 3-trimethyl-1, 3-propendiol 18. 16 Problem How many isomers are possible for pentane ? a. 4 b. 5 c. 6 d. 3 19. 17 Problem The number of particles emitted in the nuclear reaction,228 212 90Th83Bi a. 4 and 1 b. 3 and 7 c. 8 and 1 d. 4 and 7 20. 18 Problem The pH of a 10-10 M NaOH solution is nearest to : a. 10 b. 7 c. 4 d. - 10 21. 19 Problem Which of the following compound is not sp3 hybridised ? a. NH3 b. SO3-2 c. C(C6H5)3- d. SF4 22. 20 Problem The molecule which does not exhibit dipole moment is ; a. NH3 b. CHCl3 c. H2O d. CCl4 23. 21 Problem238 92Uemits -particle, the product has mass number and atomic number : a. 236, 92 b. 234, 90 c. 238, 92 d. 236, 90 24. 22 Problem What is the half-life of 6C14, if its disintegration constant is 2.31 x 10-4 yr-1 ? a. 0.3 x 104 yr b. 0.3 x 103 yr c. 0.3 x 108 yr d. 0.3 x 102 yr 25. 23 Problem Gamma rays are : a. High energy electrons b. Low energy electrons c. High energy electromagnetic waves d. High energy positrons 26. 24 Problem The compound which contain both ionic and covalent bond, is : a. CH4 b. H2 c. KCN d. KCl 27. 25 Problem The pH of a 10-8 M solution of HCl in water is : a. 8 b. -8 c. between 7 and 8 d. between 6 and 7 28. 26 Problem Which one of the following contains a co-ordinate bond ? a. BaCl2 b. CsCl c. H2O d. N2H5 + 29. 27 Problem The C H bond distance is the largest in : a. C2H2 b. C2H4 c. C2H4Br2 d. C6H6 30. 28 Problem The oxidation number of carbon in CH2O is : a. - 2 b. + 2 c. zero d. + 4 31. 29 Problem A p-orbital can accommodate : a. 4 electrons b. 6 electrons c. 2 electrons with parallel atoms d. 2 electrons with opposite spins 32. 30 Problem Heavy water is used in atomic reactor as : a. Coolant b. Moderator c. Both coolant and moderator d. Neither coolant nor moderator 33. 31 Problem Aniline is separated from a mixture by : a. Fractional crystallization b. Fractional distillation c. Vacuum distillation d. Steam distillation 34. 32 Problem The oxidation number of oxygen in potassium super oxide KO2 is : a. - 2 b. - 1 c. - 1/2 d. - 1/4 35. 33 Problem The element californium belongs to the family of : a. Actinide series b. Alkali metal family c. Alkaline earth family d. Lanthanide series 36. 34 Problem A compound contains two dissimilar asymmetric carbon atoms. The number of optical isomers is : a. 2 b. 3 c. 5 d. 4 37. 35 Problem The number of unpaired electrons in carbon atom is : a. 1 b. 2 c. 3 d. 4 38. 36 Problem The maximum extent of H-bonding is shown by : a. H2O b. HF c. H2S d. H2Se 39. 37 Problem The catalyst used in hydrogenation of oil is : a. V2O5 b. Fe c. Ni d. Pt 40. 38 Problem The IUPAC name of CH3OC2H5 is : a. 1-ethoxy methane b. 1-methoxy ethane c. methyl ethyl ether d. ethyl methyl ether 41. 39 Problem Chloroform can be obtained from : a. Methanol b. Methanal c. Propanol-1 d. Propanol-2 42. 40 Problem Alkaline hydrolysis of ester is called : a. Neutralisation b. Esterification c. Polymerization d. Saponification 43. 41 Problem Cinnabar is the ore of : a. Mercury b. Copper c. Zinc d. Lead 44. 42 Problem The magnetic quantum number is related to : a. Size b. Shape c. Orientation d. Spin 45. 43 Problem Mohrs, slat is : a. Normal salt b. Acid salt c. Basic salt d. Double salt 46. 44 Problem Which of the following metal carbonates is decomposed on heating ? a. MgCO3 b. Na2CO3 c. K2CO3 d. Rb2CO3 47. 45 Problem Which one of the following has the smallest radius ? a. O2- b. F- c. Li+ d. Be2+ 48. 46 Problem Brass in an alloy containing : a. Zn + Cu b. Cu + Sn c. Zn + Sn d. Cu + Zn + Sn 49. 47 Problem Red lead is : a. PbO b. Pb2O c. Pb2O3 d. Pb3O4 50. 48 Problem Calcium acetate on dry distillation give : a. Acetic anhydride b. Acetone c. Acetaldehyde d. Ethyl alcohol 51. 49 Problem In Ni(CO)4 the oxidation state of Ni is : a. 0 b. 4 c. 8 d. 2 52. 50 Problem For the reaction 2NH3(g) N2(g) + 3H2(g), the unit of Kp will be : a. [atm] b. [atm]3 c. [atm]-2 d. [atm]2 53. 51 Problem Which one of the following is not a colligative property ? a. Tf b. c. Tb d.kb 54. 52 Problem The equilibrium constant for the reaction SO2(g) + 1/2O2(g) SO3(g) and 2SO3(g) 2SO2 (g) + O2(g) are K1 and K2 respectively then : a. K2 = K1 b. K2 = K12 c. K2 = 1/K1 d. K2 = 1/K12 55. 53 Problem Iodine is formed when KI reacts with a solution of : a. ZnSO4 b. CuSO4 c. FeSO4 d. (NH4)2SO4 56. 54 Problem The metal oxide which decomposes on heating is : a. ZnO b. Al2O3 c. CuO d. HgO 57. 55 Problem Which one is not an ore of aluminium ? a. Anhydrite b. Bauxite c. Corundum d. Cryolite 58. 56 Problem Calculate the solubility of AgCl in mol/L if the solubility product constant for AgCl is 1 x 10-10 : a. 10-5 b. 10-10 c. 10-8 d. 10-7 59. 57 Problem The standard reduction potentials for Fe2+ | Fe and Sn2+ | Sn electrode are - 0.44 V and - 0.14 V respectively. The standard emf of the cell with reaction Fe2+ + Sn Fe + Sn2+ is a. + 0.30 V b. - 0. 30 V c. + 0.58 V d. - 0.58 V 60. 58 Problem The effect of catalyst in a chemical reaction is to change : a. Heat of reaction b. Activation energy required for the reaction c. Equilibrium constant d. Internal energy of the reactants 61. 59 Problem Which one of the following sterilizes the water ? a. CO2 b. O2 c. O3 d. SO3 62. 60 Problem The oxidation state of Mo in Mo2Cl84- is : a. + 4 b. - 4 c. + 1 d. + 2 63. 61 Problem Which one is the correct name of the compound ? a. 3-isopropyl-2-methyl pentane b. 3-ethyl-2,4-dimethyl pentane c. 2, 4-dimethyl-3-ethyl pentane d. none of the above 64. 62 Problem The product of the following reaction is : 65. 63 Problem The number of possible enantiomeric pairs that can be produced during mono chlorination of 2-methyl butane is : a. 2 b. 3 c. 1 d. 4 66. 64 Problem Lewisite is :CHCl a. ||CHAsCl3CHCl b. ||CHAsCl4CHCl|| c. CHAsCl 2CCl2 d.||CHAsCl2 67. 65 Problem Which of the following reactions will yield 2, 2-dibromopropane ? a. HCCH + 2HBr b. CH3 C CH + 2HBr c. CH3 CH = CH2 + HBr d. CH3 CH = CHCH3 + Br 68. 66 Problem Adding Cl2 in benzene in the presence of Fe is an example of : a. Addition b. Halogenation c. Substitution d. Elimination 69. 67 Problem The major product of nitration of benzoic acid is : a. 3-nitrobenzoci acid b. 2, 4-nitro benzoic acid c. 4-nitro benzoic acid d. 2-nitro benzoic acid 70. 68 Problem What is obtained when toluene reacts with chlorine in the presence of light ? a. Benzyl chloride b. Chlorobenzene c. Both (a) and (b) d. None of these 71. 69 Problem SN1 reaction of favoured by : a. Crowding at the alpha C-atom b. Non-polar solvents c. Small group on the carbon attached to the halogen atom d. All of the above 72. 70 Problem A compound is soluble in conc. H2SO4. It does not decolouries bromine in CCl4 but is oxidized by chromic anhydride in aqueous H2SO4 within 2 seconds, turning orange solution to blue green and then opaque. The original solution contain : a. An alkene b. An ether c. A secondary alcohol d. A primary alcohol 73. 71 ProblemNaOHCO2 HCl XY Z The end product in the reaction : C6H5OH1400 C a. Benzoic acid b. Salicylaldehyde c. Chlorobenzene d. Salicylic acid 74. 72 Problem Propionic acid is subjected to reduction with HI in the presence of little P, the product formed is : a. Propane b. Butane c. Ethane d. Methane 75. 73 Problem Butyne-2 contains : a. sp-hybridised carbon atoms only b. sp3- hybridized carbon atoms only c. both sp2-and sp3-hybridised carbon atoms d. both sp and sp3-hybridised carbon atoms 76. 74 Problem The empirical formula of a compound is CH2. One mole of this compound has a mass of 42 g. Its molecular formula is : a. C2H4 b. CH4 c. C3H6 d. C5H12 77. 75 Problem The number of isomers of C6H14 is : a. 4 b. 6 c. 5 d. 7 78. Part II 79. 76 Problem How will you convert ? a. Ethyl alocohol to vinyl acetate b. Tolune to p-nitrobenzyl ethyl ether 80. 77 Problem The vapour density [Hydrogen = 1] of a mixture containing NO2 and N2O4 is 38.3 at 270C. Calculate the number of moles of NO2 in 100 g of the mixture. 81. 78 Problem Give reasons for the following : a. PF5 is known but NF5 is not . b. Formic acid is a stronger acid then acetic acid. c. Hydrazones of acetaldehyde and acetone are not prepared in highly acidicmedium. d. Boiling point of hydrogen chloride is lower than that of hydrogen fluoride. 82. 79 Problem How will you bring about the following transformations ? 83. 80 Problem Calculate the simultaneous solubility of AgSCN and AgBr. Ksp for AgSCN and AgBr are 1.0 x 10-12 and 1.0 x 10-13 respectively 84. 81 Problem Arrange the following as indicated : a. n-butane, ethanol, water propane in order of increasing boiling point. b. Aniline, ethylamine, ethane, phenol in order of increasing base strength. c. HCHO, CH3COCH3,CH3CHO, C2H5COCH3 in order of increasing reactivity towards HCN. d. Arrange the following according to the instructions given against each. I.Na, Al, Fe, Pb, N (increasing density). II. Ca, Al, O, N (increasing para magnetism). a. 0.2 M NaOH, 0.2 M Na2CO3, 0.1 M AgNO3, 0.1 M FeSO4(NH4)2SO4.6H2O in order of increasing freezing point. 85. 82 Problem a. What do you understand by electrovalency ? Describe the characteristics ofelectrovalent compounds. b. Show the electronic configuration of the following compounds. a. HCl b. CH4 c. H2S d. H2O 86. 83 Problem a. Why is there no 2d or 3f orbital ? b. Deduce the possible sets of four quantum numbers when n = 2 87. 84 Problem How will you convert ? a. Methanal to ethanal b. Acetic acid to acetone c. Acetaldehyde to ethylene d. Benzene to benzoic acid e. Ethanal to chloroform 88. 85 Problem How many moles of each of the following will be present in 20 g ? a. C6H12O6 b. CH3OH c. CH3COOH d. C2H5OH e. C12H22O11 89. 86 Problem The molal elevation constant for water is 0.560 per kg of water. Calculate the boiling point of solution made by dissolving 6.0 g of urea (NH2CONH2)in 200 g of water. 90. 87 Problem Calculate the normality of resulting solution made by adding 2 drops (0.1 mL) of 0.1 N H2SO4 in 0.1 L of distilled water. 91. 88 Problem Compute the solubility of AgCl in mol/L, if the solubility product constant for AgCl is 1 x 10-10 92. 89 Problem Match the following : 1. Arrheniusa . NH4+ 2. Ostwaldb. NH4OH + NH4Cl 3. Bronsted acidc. pH scale 4. Buffer solutiond. BF3 5. Lewis acid e. Ionic theory 6. Sorensen f. Dilution law 93. 90 Problem What happens when : a. Acetylene is passed through an aqueous solution containing H+ and Hg2+ ions. b. Ethene mixed with air is passed under pressure over a silver catalyst at 2500C. c. Acetaldehyde is warmed with strong aqueous alkali solution. d. Ethanal is heated with excess of conc. H2SO4 at about 1600C. e. Anhydrous calcium acetate is heated. 94. 91 Problem Fill in the blanks : a. Pure chloroform is obtained by heating with aqueous solution of NaOH. b. CO combines with hydrogen when heated to 350 3450C in presence of ZnO + Cr2O3 under pressure to give .. c. Excess NaOH reacts with Zn to for m.. d. Potash alum is represented by the formula . 95. 92 Problem Write down five reactions, when hydrogen peroxide is used as reducing agent. 96. 93 Problem Complete and balance the following equation : a. HCl + MnO2 H2O + MnCl2 + .. b. H2SO4 + HI + .. c. P4 + I2 + H2O + H2O2 K2SO4 + MnSO4 + H2O + d. Al4C3 + H2O .. + .. 97. 94 Problem Name one method used for the manufacture of : a. Nitric acid b. Sulphuric acid c. Soda ash d. Vanaspati ghee 98. 95 Problem Calculate the weight of methane in a 9.0 L cylinder at 16 atm and 270C. R = 0.08 L atm K-1 mol-1] 99. 96 Problem Give IUPAC name for the following : (a) t-butyl alcohol 100. 97 Problem Write the Lewis structure of the following by indicating bonded electron pair with dash ( -) and non-bonded electrons or electron pairs with dot (.). a. Dinbitrotetra oxide (N2O4) b. Phosphorus acid (H3PO4) c. Carbonate ion (CO32-) d. Carbon disulphide (CS2) 101. 98 Problem Complete and balance the following equations : a. Cu2+ I- Cu+ + I2 b. Fe2+ + MnO4- Fe2+ + Mn2+ 102. 99 Problem State whether true or false, give one or two sentences in reasoning. a. The rate of diffusion of a gas is inversely proportional to its density. b. An aqueous solution of AlCl3 is acidic. c. Sulphur reduces hot nitric acid into NO2. d. Zinc hydroxide dissolves in excess of NaOH solution on evolve dihydrogen gas. 103. 100 ProblemGive one example of each of the following :a. Perkin reactionb. Aldol condensationc. Claisen condensationd. Electrophilic substancee. Nucleophilic substance 104. 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