UPSEE - Chemistry -2007 Unsolved Paper

• 1. UPSEEPAST PAPERCHEMISTRY- UNSOLVED PAPER - 2007

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 How many unit cells are present in a cube shaped ideal crystal of NaCI of mass 1.00 g ? [Atomic masses : Na = 23, Cl = 35.5] a. 2.57 x 1021 b. 5.14 x 102 c. 1.28 x 1021 d. 1.71 x 1021 4. 02 Problem Graphic is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite a. Is a non-crystalline substance b. Is an allotropic form of diamond c. Has molecules of variable molecular masses like polymers d. Has carbon atoms arranged in large plates of ring of strongly bound carbonatoms with weak interplate bonds 5. 03 Problem When CH2 = CH COOH is reduced with LiAlH4, the compound obtained will be a. CH3 CH2 COOH b. CH2 = CH CH2OH c. CH3 CH2 CH2OH d. CH3 CH2 CHO 6. 04 Problem Which one of the following compounds has the smallest bond angle in its molecule ? a. SO2 b. OH2 c. SH2 d. NH3 7. 05 Problem The solubility in water of a sparingly soluble salt AB2 is 1.0 x 10-5 mol L-1. Its solubility product number will be a. 4 x 10-15 b. 4 x 10-10 c. 1 x 10-15 d. 1 x 10-10 8. 06 Problem For the redox reaction Zn(s) + Cu2+ (0.1 M) Zn2+ (1 M) + Cu(s) taking place in a cell, Eocell is 1.10 V. Ecell for the cell will 2.303 RT be 0.0591F a. 2.14 V b. 1.80 V c. 1.07 V d. 0.82 V 9. 07 Problem The rate law for a reaction between the substances A and B is given by rate = k[A]n[B]m. On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of the reaction will be as1 a. m n2 b. (m + n) c. (n - m) d. 2(n - m) 10. 08 Problem If at 298 K the bond energies of C H, C C, C = C and H- H bonds are respectively 414, 347, 615 and 435 kJ mol-1, the value of enthalpy change for the reaction H2C = CH2(g) + H2(g) H3C CH3(g) at 298 K will be a. + 250 kJ b. - 250 kJ c. + 125 kJ d. - 125 kJ 11. 09 Problem For the reaction system, 2NO(g) + O2(g) 2NO2(g) volume is suddenly reduced to half its value by increasing the pressure on it. If the reaction is of first order with respect to O2 and second order with respect to NO; the rate of reaction will a. Diminish to one-fourth of its initial value b. Diminish to one-eighth of its initial value c. Increase to eight times of its initial value d. Increase to four times of its initial value 12. 10 Problem Which one of the following characteristics is not correct for physical adsorption ? a. Adsorption on solids is reversible b. Adsorption increases with increase in temperature c. Adsorption is spontaneous d. Both enthalpy and entropy of adsorption are negative 13. 11 Problem The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2 NH is a. CH3NH2 < NH3 < (CH3)2NH b. (CH3)2NH < NH3 < CH3NH2 c. NH3 < CH3NH2 < (CH3)2NH d. CH3NH2 < (CH3)2 NH < NH3 14. 12 Problem The solubilities of carbonates decrease down the magnesium group due to a decrease in a. Lattice energies of solids b. Hydration energies of cations c. Inter-ionic attraction d. Entropy of solution formation 15. 13 Problem Nylon threads are made for a. Polyvinyl polymer b. Polyester polymer c. Polymaide polymer d. Polyethylene polymer 16. 14 Problem Due to the presence of an unpaired electron free radicals are a. Cations b. Anions c. Chemically inactive d. Chemically reactive 17. 15 Problem The highest electrical conductivity of the following aqueous solutions is of a. 0.1 M difluoroacetic acid b. 0.1 M fluoroacetic acid c. 0.1 M chloroacetic acid d. 0.1 M acetic acid 18. 16 Problem aluminimum oxide may be electrolysed at 10000C to furnish aluminium metal (atomic mass = 27 amu; 1 F = 96,500 C). The cathode reaction is : Al3+ + 3e- Al0 To prepare 5.12 kg of aluminium metal by this method would require a. 5.49 x 101 C of electricity b. 5.49 x 104 C of electricity c. 1.83 x 107 C of electricity d. 5.49 x 107 C of electricity 19. 17 Problem Consider the reaction N2 + 3H2 2NH3 carried out at constant temperature and pressure. If H and U are the enthalpy and internal energy changes for the reaction. Which of the following expression is true ? a. H > U b. H < U c. H = U d. H = 0 20. 18 Problem The molecular shapes of SF4, CF4 and XeF4 are a. Different with 1, 0 and 2 lone pairs of electrons on the central atom,respectively b. Different with 1, 0 and 2 lone pairs of electrons on the central atom,respectively c. The same with 1, 1 and 1 lone pair of electrons on the central atoms,respectively d. The same with 2, 0 and 1 lone pairs of electrons on the central atom,respectively 21. 19 Problem The lanthanide contraction is responsible for the fact that a. Zr and Zn have the same oxidation state b. Zr and Hf have about the same radius c. Zr and Nb have similar oxidation state d. Zr and Y have about the same radius 22. 20 Problem Calomel (Hg2Cl-2) on reaction with ammonium hydroxide gives a. HgO b. Hg2O c. NH2 Hg Hg Cl d. HgNH2Cl 23. 21 Problem Alkyl halides react with dialkyl copper reagents to give a. Alkenyl halides b. Alkanes c. Alkyl copper halides d. Alkenes 24. 22 Problem Acid catalyzed hydration of alkenes except ethane leads to the formation of a. Mixture of secondary and tertiary alcohols b. Mixture of primary and secondary alcohols c. Secondary or tertiary alcohol d. Primary alcohol 25. 23 Problem The structure of diborane (B2H-6) contains a. Four 2C-2e- bonds and four 3C-2e- bonds b. two 2C-2e- bonds and two 3C-2e- bonds c. two 2C-2e- bonds and four 3C-2e- bonds d. Four 2C-2e- bonds and four 3C-2e- bonds 26. 24 Problem Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound of water during the reaction is continuously removed. The compound formed is generally known as a. An amine b. An imine c. An enamine d. A Schiffs base 27. 25 Problem An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives NH3 alongwith a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is a. CH3CH2CONH2 b. (NH2)2CO c. CH3CONH2 d. CH3NCO 28. 26 Problem The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 x 107 m-1) a. 91 nm b. 192 nm c. 406 nm d. 9.1 x 10-8 nm 29. 27 Problem Which one of the following aqueous solutions will exhibit highest boiling point ? a. 0.01 M Na2SO4 b. 0.01 M KNO3 c. 0.015 M Urea d. 0.015 M glucose 30. 28 Problem Which among the following factors is the most important in making fluorine the strongest oxidizing agent ? a. Electron affinity b. Ionization enthalpy c. Hydration enthalpy d. Bond dissociation energy 31. 29 Problem What is the equilibrium expression for the reaction ?[P4O10 ] a. Kc [P4 ][O2 ]5 [P4O10 ] b. Kc5[P4 ][O2 ] c. Kc = [O2]51 d. Kc[O2 ]5 32. 30 Problem In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to a. Generate heat b. Create potential difference between the two electrodes c. Produce high purity water d. Remove adsorbed oxygen from electrode surfaces 33. 31 Problem The enthalpies of combustion of carbon and carbon monoxide are 393.5 and 283 kJ mol-1 respectively. The enthalpy of formation of carbon monoxide per mole is a. 110.5 kJ b. 676.5 kJ c. -676.5 kJ d. -110.5 kJ 34. 32 Problem Which one of the following ores is best concentrated by froth-floatation method ? a. Magnetite b. Cassiterite c. Galena d. Malachite 35. 33 Problem Excess of KI reacts with CuSO4 solution and the Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction ? a. Cu2I2 is formed b. CuI2 is formed c. Na2S2O3 is oxidized d. Evolved I2 is reduced 36. 34 Problem Which one of the following does not have sp2 hybridised carbon ? a. Acetone b. Acetic acid c. Acetonitrile d. Acetamide 37. 35 Problem Which of the following will have a meso-isomer also ? a. 2-chlorobutane b. 2,3-dichlorobutane c. 2,3-dichloropentane d. 2-hydroxypropanoic acid 38. 36 Problem Among the following compounds, the optically active alkane having lowest molecular mass is a. CH3 CH2 CH2 CH3 b. c. d. 39. 37 Problem Consider the acidity of the carboxylic acids (i) PhCOOH (ii)o-NO2C6H4COOH (iii)p-NO2C6H4COOH (iv)m-NO2C6H4COOH which of the following order is correct ? a. (i) > (ii) > (iii) > (iv) b. (ii) > (iv) > (iii) > (i) c. (ii) > (iv) > (i) > (iii) d. (ii) > (iii) > (iv) > (i) 40. 38 Problem The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is a. Gammexane b. DDT c. Freon d. Hexachloroethane 41. 39 Problem Amogn the following compounds which can be dehydrated very easily ? a. CH3CH2CH2CH2CH2OH b. c. d. 42. 40 Problem The smog is essentially caused by the presence of a. O2 and O3 b. O2 and N2 c. Oxides of sulphur and nitrogen d. O3 and N2 43. 41 Problem The radiosiotpe, tritium ( H) has a half-life of 12.3 yr. If the initial amount of tritium is 32 mg. How many milligrams of it would remain after 49.2 yr ? a. 4 mg b. 8 mg c. 1 mg d. 2 mg 44. 42 ProblemH .OH In this reaction CH3CHO + HCN CH3CH(OH)CN CH3CH(OH)COOH An asymmetric centre is generated. The acid obtained would be a. 50%D + 50% L-isomer b. 20%D + 80% L-isomer c. D-isomer d. L-isomer 45. 43 Problem Which one of the following octahedral complexes will not show geometrical isomerism ? (A and B are monodentate ligands) a. [MA4B2] b. [MA5B] c. [MA2B4] d. [MA3B3] 46. 44 Problem The method of zone refining of metals is based on the principle of a. Greater noble character of the solid metal than that of the impurity b. Greater solubility of the impurity in the molten state than in the solid c. Greater mobility of the pure metal than that of impurity d. Higher melting point of the impurity than that of the pure metal 47. 45 Problem According to IUPAC nomenclature sodium nitrooprusside is named as a. Sodium pentacyanonitrosyl ferrate (II) b. Sodium pentacyanonitrosyl ferrate (III) c. Sodium nitroferricyanide d. Sodium nitroferrocyanide 48. 46 Problem Phospholipids are esters of glycerol with a. One carboxylic acid residue and tow phosphate groups b. Three phosphate groups c. Three carboxylic acid residues d. Two carboxylic acid residues and one phosphate groups 49. 47 Problem The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, k= Ae-E*/RT. Activation energy (E*) of the reaction can be calculated by ploting 1 a. log k vs T 1 b. log k vs log T c. k vs T 1 d. k vs log T 50. 48 Problem In a set of the given reactions, acetic acid yielded a product C.CH3COOH PCl5 A C6 H6C2 H5 MgBrAanh. AlCl3B ether c Product C would be a. CH3CH(OH)C6H5 b. c. CH3CH(OH)C2H5 d. CH3COC6H5 51. 49 Problem The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is a. Lu3+ < Eu3+ < La3+ < Y3+ b. La3+ < Eu3+ < Lu3+ < Y3+ c. Y3+ < La3+ < Eu3+ < Lu3+ d. Y3+ < 3Lu3+ < Eu3+ < La3+ (Atomic no. Y= 39, La = 57, Eu= 63, Lu =71) 52. 50 Problem Which one of the following compounds, is not a protonic acid ? a. SO(OH)2 b. SO2(OH)2 c. B(OH)3 d. PO(OH)3 53. 51 Problem Formation of a solution from two components can be considered as (1) pure solvent separated solvent molecules, H1 (2) pure solvent separated solvent molecules, H2 (3) pure solvent separated solvent molecules, H3 solution so formed will be ideal if a. Hsoln = H1 - H2 - H3 b. Hsoln = H3 - H2 - H2 c. Hsoln = H1 + H2 + H3 d. Hsoln = H1 + H2 - H3 54. 52 Problem Among the following, the pair in which the two species are not isostructural, is a. SiF4 and SF4 b. IO3 and XeO3 c. BH 4 and NH4 d. PF 6 and SF6- 55. 53 Problem Which one of the following structures represents the peptide chain ? a. b. c. d. 56. 54 Problem The maximum number of molecule is present in a. 15 L of H2 gas at STP b. 5 L of N2 gas at STP c. 0.5 g of H2 gas d. 10 g of O2 gas 57. 55 Problem A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid ? a. Three b. Four c. One d. Two 58. 56 Problem Ionic radii are a. Inversely proportional to effective nuclear charge b. Inversely proportional to square of effective nuclear charge c. Directly proportional to effective nuclear charge d. Directly proportional to square of effective nuclear charge 59. 57 Problem The helical structure of protein is stabilized by a. Dipeptide bonds b. Hydrogen bonds c. Ether bonds d. Peptide bonds 60. 58 Problem60 The radioactive isotope 27 Co which is used in the treatment of cancer can be made by (n, p) reaction. For this reaction the target nucleus is59 a. 28 Ni59 b. 27 Co60 c. 28 Ni60 d. 27 Co 61. 59 Problem the work done during the expansion of a gas from a volume of 4 dm3 to 6 dm3 against a constant external pressure of 3 atm, is a. - 6 J b. -608 J c. +304 J d. -304 J 62. 60 Problem The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass of Al = 27) a. 180 kg b. 270 kg c. 540 kg d. 90 kg 63. 61 Problem Which one of the following compounds, is most acidic ? a. b. c. d. 64. 62 Problem The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of P and 2 moles of Q would be a. 140 torr b. 20 torr c. 68 torr d. 72 torr 65. 63 Problem Which functional group participates in disulphide bond formation in proteins ? a. Thiolacetone b. Thiol c. Thioether d. Thioester 66. 64 Problem The energy of second Bohr orbit of the huydrogen atom is 328 kJ mol-1; hence the energy of fourth Bohr orbit would be a. -41 kg mol-1 b. -1312 kJ mol-1 c. -164 kJ mol-1 d. -82 kJ mol-1 67. 65 Problem Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ? a. Cl < F < S < O b. O < S < F < Cl c. S < O < Cl < F d. F < Cl < O < S 68. 66 Problem Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere ? a. Polyalogens b. Ferroncenes c. Fullerenes d. Freons 69. 67 Problem What amount of bromine will be required to convert 2 g of phenol into 2, 4, 6- bribromo phenol ? a. 20.44 g b. 6.00 g c. 4.00 g d. 10.22 g 70. 68 Problem Isomers of propionic acid are a. HCOOC2H5 and CH3COOCH3 b. HCOOC2H5 and C3H7COOH c. CH3COOCH3 and C3H7OH d. C3H7OH and CH3COCH3 71. 69 Problem Metamers of ethyl propionate are a. C4H9CCOH and HCOOC4H9 b. C4H9COOH and CH3COOC3H7 c. CH3COOCH3 and CH3COOC3H7 d. CH3COOC3H7 and C3H7COOCH3 72. 70 Problem What is the correct IUPAC name of a. 4-methoxy-2nitrobenzaldehyde b. 4-formyl-3-nitro anisole c. 4-methoxy-6-nitrobenzaldehyde d. 2-formyl-5-methoxy nitrobenzene 73. 71 Problem Which of the following is anhydride of perchloric acid ? a. Cl2O7 b. Cl2O5 c. Cl2O3 d. HClO 74. 72 Problem The concentration of H2O2 solution of 10 volume is a. 30% b. 3% c. 1% d. 10% 75. 73 Problem The dipole moment of HBr is 1.6 x 10-30 cm and inter-atomic spacing is 1 . The % ionic character of HBr is a. 7 b. 10 c. 15 d. 27 76. 74 Problem CaC2 + N2 A, product A is a. CaCN2 b. CaCN2 and C c. CaCN2 + N2 d. None of these 77. 75 Problem The safest and the most common alternative of sugar is a. Glucose b. Asparatme c. Saccharin d. Cyclodextrin 78. FOR SOLUTIONS VISIT WWW.VASISTA.NET