1. UPSEEPAST PAPERSCHEMISTRY- UNSOLVED PAPER - 1999

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 has the highest e/m ratio? a. He2+ b. H2 c. He+ d. D+ 4. 02 Problem The electrons, identified by quantum numbers n and l: (i) n=4,l=1 (ii) n=4,l=0 (iii) n=3,l=2 (iv) n=4,l=1can be placed in order of increasing energy from the lowest to highest as : a. (iv) < (ii) < (iii) < (i) b. (ii) < (iv) < (i) < (iv) c. (i) < (iii) < (ii) < (iv) d. (iii) < (i) < (iv) < (ii) 5. 03 Problem What is the correct orbital designation of an electron with the quantum number, n = 4, l = 3, m = -2, s = 1/2 ? a. 3s b. 4f c. 5p d. 6s 6. 04 Problem Electron affinity is maximum for : a. Cl b. F c. Br d. I 7. 05 Problem Which one of the following has largest size ? a. Al b. Al3+ c. Al+ d. Al2+ 8. 06 Problem The ionization potential order for which set is correct ? a. Cs < Li < K b. Cs > Li > B c. Li > K > cs d. B > Li > K 9. 07 Problem The hydrogen bond is strongest in : a. O H .S b. F H ...O c. S H .. O d. F H . F 10. 08 Problem The molecule which has zero dipole moment is : a. CH3Cl b. NF3 c. BF3 d. ClO2 11. 09 Problem The compound which contains both ionic and covalent bond : a. KCl b. KCN c. CH4 d. H2 12. 10 Problem Hydrogen bonding would not affect the boiling point of : a. CH3OH b. HI c. H2O d. NH3 13. 11 Problem The half-life period of 92U238 is 4.5 x 109 Yr. After how many years, the amount238 92Uwill be reduced to half of its present amount : a. 4.5 x 104.5 yr b. 4.5 x 109 yr c. 9.0 x yr d. 13.5 x 109 yr 14. 12 Problem C 14 has a half-life of 5760 yr. 100 mg of sample containing C-14 is reduced to 25 mg in : a. 17280 yr b. 1440 yr c. 2880 yr d. 11520 yr 15. 13 Problem The density of neon will be highest at : a. 00C, 2 atm b. 2730C, 2 atm c. STP d. 2730C, 1 atm 16. 14 Problem One mole of CO2 contains : a. 3g atoms of CO2 b. 18.1 x 1023 molecules of CO2 c. 6.02 x 1023 atoms of O d. 6.02 x 1023 atom of C 17. 15 Problem The root mean square velocity of a gas its doubled when the temperature is : a. Increased four times b. Increased two times c. Reduced to half d. Reduced to one fourth 18. 16 Problem Volume of gas at NTP is 1.12 x 10-7 cm3. The number of molecules in it is : a. 3.01 x 1012 b. 3.01 x 1024 c. 3.01 x 1023 d. 3.01 x 1020 19. 17 Problem The existence of substance in more than one physical forms is known as : a. Isotropy b. Allotropy c. Amorphism d. None of these 20. 18 Problem At 250C,the highest osmotic pressure is exhibited by 0.1 M solution of : a. Urea b. Glucose c. KCl d. CaCl2 21. 19 Problem 4.0 g of NaOH is dissolved in 100 mL solution The normality of the solution is a. 0.1 N b. 0.5 N c. 4.0 N d. 1.0 N 22. 20 Problem Which of the following pairs of solution are isotonic at the same temperature ? a. 0.1 M Ca(NO3)2 and 0.1 M Na2SO4 b. 0.1 M NaCl and 0.1 M Na2SO4 c. 0.1 M urea and 0.1 M MgCl2 d. 0.2 M urea and 0.1 M NaCl 23. 21 Problem The vapour pressure of pure benzene at a certain temperature is 640 mm Hg. A non volatile non-electrolyte solid weighing 2.175 g is added to 39.0 g benzene. The vapour pressure of the solution is 600 mm. What is the molecular weight of the solid substance ? a. 62.25 b. 52.65 c. 69.6 d. 25.65 24. 22 Problem The molarity of pure water is : a. 50 M b. 18 M c. 55.6 M d. 100 M 25. 23 Problem How many atoms are contained in one mole of sucrose (C12H22O11) ? a. 20 x 6.02 x 1023 atoms/mol b. 45 x 6.02 x 1023 atoms/mol c. 5 x 6.02 x 1023 atoms/mol d. none of the above 26. 24 Problem For an electrolyte elevation in boiling point is directly proportional to : a. Molarity b. Molality c. Mole fraction d. All of these 27. 25 Problem The equivalent weight of KMnO4 for acid solution is a. 79 b. 52.16 c. 158 d. 31.6 28. 26 Problem Gold number is the index for : a. Electroplated gold b. metallic gold c. protective colloid d. purity of gold 29. 27 Problem Which of the following electrolytes is least effective in coagulating ferric hydroxide solution ? a. KBr b. K2SO4 c. K2CrO4 d. K4[Fe(CN)6] 30. 28 Problem The equilibrium constant for the reversible reaction N2 + 3H2 2NH3 is K and13 for Reaction 2 N2 2 H2 NH3 , the equilibrium constant is K. The K and K will be related as : K x K = 1 K = K K = K K= K 31. 29 Problem The equilibrium constant for a reaction, N2(g) + O2(g) 2NO(g) is 4 x 10-4 at 2000 K. In the presence of catalyst, the equilibrium is attained 10 times faster. The equilibrium constant in presence of catalyst at 2000 K is : a. 10 x 10 4 b. 4 x 10 2 c. 4 x 10 4 d. 40 x 10 4 32. 30 Problem For nth order reaction, the half-life period t1/2 is proportional to initial concentration as : 1 a.an 1n 1 b. a c. an 11 d. an 33. 31 Problem What is the half-life of a radioactive substance if 5% of any given amount of the substance disintegrates in 40 min ? a. 20 min b. 10 min c. 13 min 25 sec d. 160 min 34. 32 Problem The rate of reaction is doubled for every 100 rise in temperature. The increase in reaction rate as a result of temperature rise from 100C to 1000C is : a. 614 b. 400 c. 512 d. 112 35. 33 Problem Catalytic poisons act by : a. Making the products chemically inactive b. Increasing the rate of the backward reaction c. Chemical combination with any one of the reactants d. Preferential adsorption on the catalyst surface 36. 34 Problem The following is endothermic reaction : a. Decomposition of water b. Conversion of graphite to diamond c. Dehydrogenation of ethane to ethylene d. All of the above 37. 35 Problem When ice melts into water, the entropy : a. Becomes zero b. Remains same c. Decrease d. Increases 38. 36 Problem The heat of neutralization of strong base and strong acid is 57.0 kJ. The heat released when 0.5 mol of HNO3 is added to 0.20 moles of NaOH solution is : a. 34.9 kJ b. 57.0 kJ c. 11.4 kJ d. 28.5 kJ 39. 37 Problem A silver cup is plated with silver by passing 965C of electricity. The amount of Ag deposited, is : a. 107.89 g b. 9.89 g c. 1.0002 g d. 1.08 g 40. 38 Problem Total charge on 1 mole of a monovalent metal ion is equal to : a. 9.65 x 104 C b. 1.6 x 10-19 C c. 6.2 x 1018 C d. none of these 41. 39 Problem Which is Lewis acid ? a. BF3 b. NF3 c. Cl- d. H2O 42. 40 Problem The dissociation constants of two weak acids are K1 and K2. The relative strength of two acids is given by : 3/2K1 a. K2 1/2K1 b.K2K1K2 c.K2K1K1 d.K2 43. 41 Problem The pH of an acidic buffer mixture is : a. > 7 b. = 7 c. < 7 d. depends upon Ka of the acid 44. 42 Problem The pH of 10-10 M NaOH solution is nearest to : a. 4 b. -10 c. 4 d. 7 45. 43 Problem For weak acid-strong base titration, the indicator used is : a. Phenolphthalein b. Litmus c. Methyl orange d. K2Cr2O7 46. 44 Problem Which one has maximum solubility in liquid CCl4 ? a. NaCl b. Cl2 c. I2 d. Br2 47. 45 Problem The solubility of AgCl in 0.2 M NaCl solution is : (Ksp of AgCl = 1.20 x 10- 10) : a. 6.0 x 10-10 M b. 0.2 M c. 1.2 x 10-10 M d. 0.2 x 10-10 M 48. 46 Problem Oxidation number of N in HNO3 is : a. - 3.5 b. + 3.5 c. - 3, + 5 d. + 5 49. 47 Problem The oxidation state of Fe in Fe3O4 is : a. + 3 b. 8 /3 c. + 6 d. + 2 50. 48 Problem Which of the following order of ionisation energy is correct ? a. Be > B > C > N < O b. B < Be > C < O < N c. Be > B > C > N > O d. B < Be < N < C < O 51. 49 Problem Which one has least ionization potential is : a. Ne b. N c. O d. F 52. 50 Problem Number of elements presents in the fifth period of periodic table is : a. 32 b. 10 c. 18 d. 8 53. 51 Problem Element with electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3 belongs to the following group of the periodic table : a. 2nd b. 5th c. 3rd d. 7th 54. 52 Problem Which one has the highest boiling point ? a. H2 b. Xe c. CH4 d. He 55. 53 Problem Malachite is an ore of : a. Fe b. Zn c. Hg d. Cu 56. 54 Problem In the Hoopes process of aluminium extraction, the fused materials in three different layer. These layers remain separated even in electrolytic reduction, because : a. Cell has the arrangement for separation b. All the layers have different densities c. All the layers are at different temperature d. Upper layer is attracted by cathode and lower layer is attracted by anode 57. 55 Problem Amalgams are : a. Always in liquid state b. Highly coloured alloys c. Alloys which have a great resistance to abrasion d. Alloys which contain Hg as one of the constituents 58. 56 Problem Gun metal is an alloy of : a. Cu and Al b. Cu and Sn c. Cu, Zn and Sn d. Cu, Zn and Ni 59. 57 Problem The amount of H2O2 present in 1 L of 1.5 N H2O2 solution, is : a. 25.5 g b. 3.0 g c. 8.0 g d. 2.5 g 60. 58 Problem The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm), is : a. 0.1 b. 0.01 c. 0.001 d. 1 61. 59 Problem Which one of these is basic ? a. SiO2 b. SO2 c. CO2 d. Na2O 62. 60 Problem Baking soda is : a. NaHCO3 b. K2CO3 c. Na2CO3 d. NaOH 63. 61 Problem Which one of the following salts does not impart colour to the flame ? a. KI b. LiCl c. CaCl2 d. MgCl2 64. 62 Problem Alum is : a. FeSO4(NH4)2SO4. 24H2O b. Na2SO4 . Al2 (SO4)3 . H2O c. KCl . MgCl2 . 6H2O d. NaAlO2 65. 63 Problem Which one of the following is not an allotrope of carbon ? a. Carborundum b. Diamond c. Soot d. Graphite 66. 64 Problem Which of the following oxides in neutral ? a. N2O3 b. N2O4 c. N2O5 d. N2O 67. 65 Problem Fermings salt is : a. HF b. NaCl c. KClO3 d. KHF2 68. 66 Problem Freons are : a. CClF3 b. CFCl3 c. CCl2F2 d. All of these 69. 67 Problem Of the ions Zn2+, Ni2+ and Cr3+ (atomic number of Zn = 30, Ni = 28 and Cr = 24) a. All these are colourless b. All these are coloured c. Only Ni2+ is coloured and Zn2+ and Cr3+ are colourless d. Only Zn2+ is colourless and Ni2+ and Cr3+ are coloured 70. 68 Problem Correct electronic configuration of Cr (Z = 24) is : a. 1s22s22p63s2 3p6 3d7 4s1 b. 1s22s22p63s2 3p6 3d5 4s1 c. 1s22s22p63s2 3p6 3d7 4s5 d. 1s22s22p63s2 3p6 3d6 4s2 71. 69 Problem In haemoglobin the iron is in the following oxidation state : a. + 4 b. + 2 c. + 3 d. +1 72. 70 Problem Empirical formula of hydrocarbon containing 80% carbon and 20% hydrogen is : a. CH3 b. CH4 c. CH d. CH2 73. 71 Problem The order of decreasing stability of the carbanions is : (CH3 )3 C 1 , CH3 2 CH 2 , CH3CH2 (3), C6 H5CH2 4 a. 1 > 2 > 3 > 4 b. 4 > 3 > 2 > 1 c. 1 > 2 > 4 > 3 d. 4 > 1 > 2 > 3 74. 72 Problem The hybridization of carbon atom in C C single bond of H2C = CH CH = CH2 is : a. sp3 - sp b. sp2 - sp c. sp2 sp2 d. sp3 sp3 75. 73 Problem Which of the following is optically active ? 76. 74 Problem Total number of structural isomers possible for C3H6 are : a. 2 b. 1 c. 4 d. 3 77. 75 Problem C7H7Cl has in all . Isomers : a. 5 b. 2 c. 4 d. 3 78. 76 Problem Which one of the following is the strongest bond ? 79. 77 Problem Which one of the following is the strongest bond ? Which is the decreasing order of reactivity among the following compounds towards electrophilic substitution reaction ? (I) chlorobenzene (II) benzene (III) anilinium chloride (IV) toluene a. IV > II > I > III b. I > IV > II > III c. III > I > II > IV d. I > II > III > IV 80. 78 Problem A new C C bond is formed in : a. A Cannizaros reaction b. Reimer-Tiemann reaction c. Friedel-Crafts reaction d. Celmmensen reaction 81. 79 Problem Reaction of chloroform with KOH in presence of a primary aromatic amine is called : a. Carbylamine reaction b. Reduction c. Hydrolysis d. Wurtz reaction 82. 80 Problem Polymer of chloroethylene is : a. PVC b. Nylon c. Teflon d. Terylene 83. 81 Problem Silver benzoate will react with bromine in acetone to form : 84. 82 Problem Which one of the following is not formed when glycerol reacts with HI ? a. CH3 CHI CH3 b. CH3 CH = CH2 c. CH2OH CHI CH2OH d. CH2 = CH CH2I 85. 83 Problem ClCH2CH2OH is stronger acid then CH3CH2OH because of : a. - I effect of Cl increases negative charge on O atom of alcohol b. - I effect of Cl disperses negative charge on O atom to produce more stablecation c. - I effect of Cl disperses negative charge on O atom to produce more stableanion d. none of the above 86. 84 Problem Acidity of phenol is due to : a. Hydrogen bonding b. Phenolic group c. Benzene ring d. Resonance stabilization of is anion 87. 85 Problem Which of the following compounds is optically active ? a. CH3CHClCOOH b. CH3CH2CH2CH3 c. (CH3)2CHOH d. (CH3)3CCl 88. 86 Problem Aldol condensation would not occur in : a. CH3COCH3 b. CH3CH2CHO c. HCHO d. CH3CHO 89. 87 Problem Reduction of nitrobenzene in the presence of Zn/NH4Cl gives : a. Azobenzene b. Hydrazobenezene c. N-phenyl hydroxyl amine d. Aniline 90. 88 Problem On reduction secondary amine is given by : a. Nitroethane b. Methylcyanide c. Methyliscoyanide d. Nitrobenzene 91. 89 Problem The change in optical rotation of freshly prepared solution of cane sugar with time is known as : a. Mutarotation b. Inversion c. Specific rotation d. Rotation motion 92. 90 Problem Peptide bond is : 93. 91 Problem Example of addition polymer is : a. Melamine b. Bakelite c. Buna S d. Nylon 6 94. 92 Problem Addition polymerization is catalyses by : a. malamine b. Lewis acids c. Free radicals d. All of the above 95. 93 Problem Select the correct order of the strength of acids given below : a. HClO4 < HClO3 < HClO < HClO2 b. HClO4 < HClO3 < HClO2 < HClO c. HClO4 < HClO3 < HClO2 < HClO4 d. None of these 96. 94 Problem Acetic anhydride reacts with diethyl ether in the presence of anhydrous AlCl3 to give : a. CH3CH2COOH b. CH3CH2COOCH2CH3 c. CH3COOCH3 d. CH3COOC2H5 97. 95 Problem Fenton reagent is : a. Zn + HCl b. Sn + HCl c. FeSO4 + H2O2 d. None of the above 98. 96 Problem The product formed by heating iodoform with KOH is : a. HCHO b. HCOOK c. CH3COOK d. CH3CHO 99. 97 Problem The energy of an electron in second Bohr orbit of hydrogen atom is : a. - 5.44 x 10-19 eV b. - 5.44 x 10-19 cal c. - 5.44 x 10-19 kJ d. - 5.44 x 10-19 J 100. 98 Problem The emf of the cell Ni |Ni2+| (1.0M)| |Ai3+ (1.0M)| Au is Eo Ni2+, Ni = - 0.25 V and E0 Au3+, Au = + 1.5 V : a. 2.00 V b. 1.25 V c. - 1.25 V d. 1.75 V 101. 99 Problem The empirical formula of an acid is CH2O2, the probable molecular formula of acid may be : a. CH3COOH b. C3H7COOH c. HCOOH d. C2H5COOH 102. 100 ProblemThe strongest reducing agent among the alkali metals is :a. Lib. Nac. Kd. Cs 103. FOR SOLUTIONS VISIT WWW.VASISTA.NET