1. UPSEEPAST PAPERCHEMISTRY- UNSOLVED PAPER - 2004

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 of the following has highest knocking ? a. Olefins b. Branched chain olefins c. Straight chain olefins d. Aromatic hydrocarbons 4. 02 Problem Which is most basic in character ? a. CsOH b. KOH c. NaOH d. LiOH 5. 03 Problem The mass of BaCO3 produced when excess CO2 is bubbled through a solution of 0.205 mole Ba(OH)2 is : a. 81 g b. 40.5 g c. 20.25 g d. 162 g 6. 04 Problem Would gaseous HCl be considered as an Arrhenius acid ? a. Yes b. No c. Not known d. Gaseous HCl does not exist 7. 05 Problem The degree of hydrolysis in hydrolytic equilibrium at salt concentration of 0.001 M is : (Ka = 1 x 10-5) a. 1 x 10-3 b. 1 x 10-4 c. 5 x 10-4 d. 1 x 10-6 8. 06 Problem The formula of potash alum is : a. K2SO4 . Al2(SO4)3 . 24H2O b. K2SO4 . Al2(SO4)3 . 18H2O c. K2SO4 . (NH4)2SO4 . 18H2O d. Na2SO4 . Al2(SO4)3 . 24H2O 9. 07 Problem Which of the following has the lowest freezing point ? a. 0.1 m sucrose b. 0.1 m urea c. 0.1 m ethanol d. 0.1 m glucose 10. 08 Problem No two electron can have the same values of .. quantum numbers. a. One b. Two c. Three d. Four 11. 09 Problem A litre of solution is saturated with AgCl. To this solution if 1.0 x 10-4 mole of solid NaCl is added, what will be the [Ag+], assuming no volume change ? a. More b. Less c. Equal d. Zero 12. 10 Problem The formula of mineral borax is : a. Na2B4O7 b. Na2B4O7 . 4H2O c. Na2B4O7 . 5H2O d. Na2B4O7 . 10H2O 13. 11 Problem An aerosol is a : a. Dispersion of a solid or liquid in a gas b. Dispersion of a solid in a liquid c. Dispersion of a liquid in a liquid d. Solid solution 14. 12 Problem A compound contains 54.55% carbon, 9.09% hydrogen, 36.36% oxygen. The empirical formula of this compound is : a. C3H5O b. C4H8O2 c. C2H4O2 d. C2H4O 15. 13 Problem Which of the following is most likely to show optical isomerism ? a. b. c. d. 16. 14 Problem The correct order of ionization energy for comparing carbon, nitrogen and oxygen atoms a. C > N > O b. C > N < O c. C < N > O d. C < N < O 17. 15 Problem Which of the following functional groups, cannot be reduced to alcohol using NaBH4 in ethanolic solution ? a. R O R b. RCOCl c. R COOH d. R CHO 18. 16 Problem Which one of the following is expected to have largest size ? a. F b. O2- c. Al3+ d. N3- 19. 17 Problem Acetylene reacts with HCN in the presence of Ba(CN)2 to yield : a. 1, 1-dicyanoethane b. 1, 2-dicyanoethane c. vinyl cyanide d. none of the above 20. 18 Problem An aqueous solution of potash alum gives : a. Two types of ions b. Only one type of ion c. Four types of ions d. Three types of ions 21. 19 Problem pH of 1 M NH3 aqueous solution is : (Kb = 1.8 x 10-5) a. 11.13 b. 12.5 c. 13.42 d. 11.55 22. 20 Problem Equivalent weight of an acid : a. Depends on the reaction involved b. Depends upon the number of oxygen atoms present c. Is always constant d. None of the above 23. 21 Problem The formation of SO3 takes place according to the following reaction : 2SO2O2 2SO3; H 45.2 kcal the formation of SO3 is favoured by : a. increase in temperature b. removal of oxygen c. increase of volume d. increase of pressure 24. 22 Problem The compound in which cation is isoelectronic with anion is : a. NaCl b. CsF c. NaI d. K2S 25. 23 Problem Which of the following equations correctly represents the standard heat of formation ( Hf0 ) Of methane ? a. C (Diamond) + 4H(g) CH4(g) b. C (Diamond) + 2H2(g) CH4(g) c. C (graphite) + 2H2(g) CH4(g) d. C (graphite) + 4H (g) CH4(g) 26. 24 Problem The paramagnetic molecule at ground state among the following is : a. H2 b. O2 c. N2 d. CO 27. 25 Problem What is the effect of increasing pressure on the dissociation of PCl5 according to the equation ? PCl5(g) PCl3(g) + Cl2(g) a. Dissociation decreases b. Dissociation increases c. Dissociation does not change d. None of the above 28. 26 Problem The ground state term symbol for an electronic state is governed by a. Heisenbergs principle b. Hunds rule c. Aufbau principle d. Pauli exclusion principle 29. 27 Problem Reaction of alkyl halides with aromatic compounds in presence of anhydrous AlCl3 is known as : a. Friedel-Crafts reaction b. Hofmann degradation c. Kolbes synthesis d. Beckmann rearrangement 30. 28 Problem The following compound will undergo electrophilic substitution more readily than benzene : a. Nitrobenzene b. Benzoic acid c. Benzaldehyde d. Phenol 31. 29 Problem The following salt shows maximum covalent character : a. AlCl3 b. MgCl3 c. CsCl d. LaCl3 32. 30 Problem Which chlorine atom is more electronegative in the following ? a. CH3-CI b. CH3-CH2-CI c. d. 33. 31 Problem Which of the following is paramagnetic ? a. B2 b. C2 c. N2 d. F2 34. 32 Problem The correct statement about the compounds (a), (b) and (c) is : a. (A) and (B) are identical b. (A) and (B) are diastereomers c. (A) and (B) are enantiomers d. (A) and (B) are enantiomers 35. 33 Problem What is the ratio of mass of an electron to the mass of proton ? a. 1:2 b. 1 : 1 c. 1 : 1837 d. 1 : 3 36. 34 Problem The heat of combustion of carbon to CO2 is -393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is : a. + 315 kJ b. - 31.5 kJ c. - 315 kJ d. + 31.5 kJ 37. 35 Problem The ionic radii of Rb+ and I- are 1.46 and 2.16 . The most probable type of structure exhibited by it is : a. CsCl type b. ZnS type c. NaCl type d. CaF2 type 38. 36 Problem A precipitate is changed to colloidal solution by the following process : a. Dialysis b. Ultrafiltration c. Peptization d. Electrophoresis 39. 37 Problem Paulings electrongegativity values for elements are useful in predicting : a. Polarity of bonds in molecules b. Position of elements in electromotive series c. Co-ordination number d. Dipole moment of various molecules 40. 38 Problem The moment of colloidal particles towards their respective electrodes in the presence of an electric field is known as : a. Electrolysis b. Brownian movement c. Dialysis d. Electrophoresis 41. 39 Problem The trigonal bipyramidal geometry results from the hybridization : a. dsp3 or sp3d b. dsp2 or sp3d c. d2sp3 or sp3d2 d. d3p2 or d2p3 42. 40 Problem Two moles of PCl5 were heated in a closed vessel of 2 L. At equilibrium. 40% of PCl5 is dissociated into PCl3 and Cl2. The value of equilibrium constant is : a. 0.53 b. 0.267 c. 2.63 d. 5.3 43. 41 Problem [EDTA]4- is a : a. monodentate ligand b. bidentate ligand c. quadridentate ligand d. hexadentate ligand 44. 42 Problem Which one of the following compound is most basic ? a. b. c. d. all are equally basic 45. 43 Problem The number of secondary hydrogens in 2, 2-dimethyl butane is : a. 8 b. 6 c. 4 d. 2 46. 44 Problem Which of the following will not give iodoform test ? a. Isoporopyl alchol b. Ethanol c. Ethanal d. Benzyl alcohol 47. 45 Problem The molecule having smallest bond angle is : a. H2O b. H2S c. NH3 d. H2Te 48. 46 Problem The most appropriate reagent to distinguish between acetaldehyde and formaldehyde is : a. Fehlings solution b. Tollens reagent c. Schiffs reagent d. Iodine in presence of base 49. 47 Problem Which of the following substances act as an oxidizing as well as a reducing agent ? a. Na2O b. SnCl2 c. Na2O2 d. NaNO2 50. 48 Problem What is the effect of having the pressure by doubling the volume on the following system at 5000C ? H2 gI2 g 2HI g a. Shift to reactant side b. Shift to product formation c. Liquefaction of HI d. No effect 51. 49 Problem Identify the non-polar molecule in the set of compounds given : HCl, HF, H2, HBr a. H2 b. HCl c. HF, HBr d. HBr 52. 50 Problem Which of the following act as protective colloid ? a. Silica gel b. Gelatin c. Sodium acetate d. None of these 53. 51 Problem Which of the following molecules has three-fold axis of symmetry ? a. NH3 b. C2H4 c. CO2 d. SO2 54. 52 Problem The number of coulombs required to reduce 12.3 g of nitrobenzene to aniline is : a. 115800 C b. 5790 C c. 28950 C d. 57900 C 55. 53 Problem A solid is made of two elements X and Z. The atoms Z are in CCP arrangement while the atom X occupy all the tetrahedral sites. What is the formula of the compound ? a. XZ b. XZ2 c. X2Z d. X2Z3 56. 54 Problem The solubility product of Barium suphate is 1.5 x 10-9 at 180C. Its solubility in water at 180C is : a. 1.5 x 10-9 b. 1.5 x 10-5 c. 3.9 x 10-9 d. 3.9 x 10-5 57. 55 Problem Doping of silicon (Si) with boron (B) leads to : a. n-type semiconductor b. p-type semiconductor c. metal d. insulator 58. 56 Problem pH scale was introduced by a. Arrhenius b. Sorensen c. Lewis d. Lowery 59. 57 Problem Chlorination of benzene is not possible in the following reaction :FeCl3 a. C6H6 + Cl2H b. C6H6 + HOClZnCl2 c. C6H6 + I Cl AlCl3 d. C6H6 + Cl2 60. 58 Problem Which of the following orders regarding relative stability of free radicals is correct ? a. 30 < 20 < 10 b. 30 > 20 > 10 c. 10 < 20 > 30 d. 30 > 20 < 10 61. 59 Problem Which of the following pairs involves isoelectronic ions ? a. Mn3+ and Fe2+ b. Mn2+ and Fe3+ c. Cr3+ and Mn2+ d. Fe2+ and Co2+ 62. 60 Problem A polymer containing nitrogen is : a. Bakelite b. Dacron c. Rubber d. Nylon-66 63. 61 Problem Which one of the following has the highest electro negativity ? a. Br b. Cl c. P d. Si 64. 62 Problem The conversion of acetophenone to acetanilide is best accomplished by using : a. Beckmann rearrangement b. Curtius rearrangement c. Lossen rearrangement d. Hofmann rearrangement 65. 63 Problem Which one of the following is called amphoteric solvent ? a. Ammonium hydroxide b. Chloroform c. Benzene d. Water 66. 64 Problem 100 mL of 0.04 N HCl aqueous solution is mixed with 100 mL of 0.02 N NaOH solution. The pH of the resulting solution is : a. 1.0 b. 1.7 c. 2.0 d. 2.3 67. 65 Problem The strength in volumes of a solution containing 30.36 g/L of H2O2 is : a. 10 volume b. 20 volume c. 5 volume d. none of these 68. 66 Problem The number of orbitals present in the shell with n = 4 is : a. 16 b. 8 c. 18 d. 32 69. 67 Problem Which of the following is the best protective colloid ? a. Gelatin (Gold No. = 0.05) b. Gum Arabic (Gold No. = 0.15) c. Egg albumin (Gold No. = 0.08) d. None of the above 70. 68 Problem If a system is at equilibrium, the rate of forward to the reverse reaction is : a. Less b. Equal c. High d. At equilibrium 71. 69 Problem Producer gas is a mixture of : a. CO and N2 b. CO2 and H2 c. N2 and O2 d. CH4 and N2 72. 70 Problem Enthalpy of solution of NaOH (solid) in water is 41.6 kJ mol-1. When NaOH is dissolved in water, the temperature of water : a. Increases b. Decreases c. Does not change d. Fluctuates indefinitely 73. 71 Problem Formation of terylene is an example of : a. Condensation polymerization b. Addition polymerization c. Esterification d. Saponification 74. 72 Problem A petroleum fraction having boiling range 70-2000C and containing 6-10 carbon atoms per molecule is called : a. Natural gas b. Gas oil c. Gasoline d. Kerosene 75. 73 Problem Electrons in a paramagnetic compound are : a. Shared b. Unpaired c. Donated d. Paired 76. 74 Problem The dehydration of 2-methyl butanol with conc. H2SO4 gives : a. 2-methyl butene as major product b. pentene c. 2-mehtyl but 2-ene as major product d. 2-methyl pent-2-ene 77. 75 Problem The final products fromed on the addition of KI to copper sulphate solution are : a. K2SO4 . CuI2 and I2 b. K2SO4 . Cu2I2 and I2 c. K2SO4 . and Cu2O d. K2SO4. CuO and I2 78. FOR SOLUTIONS VISIT WWW.VASISTA.NET