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CSIR UGC NET 2008 : CHEMICAL SCIENCES - PAPER I

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Chemical Sciences Paper I(PART B ) 41. Complexes of which of the following metals are used in the treatment of rheumatoid arthritis: 1. 2. 3. 4. 42. Non-heme iron-sulfur proteins are involved in: 1. 2. 3. 4. 43. L mol 1 cm 1 L 1 mol cm 1 L mol cm 1 L mol cm Gelatin is added during polarographic measurements to: 1. 2. 3. 4. 46. RuCl2(PPh3)3 HCo(CO)3 RhCl(PPh3)3 K2PtCl6 The unit of molar absorptivity is: 1. 2. 3. 4. 45. Electron transfer. Proton transfer. Both electron and proton transfer Oxygen transfer. Active catalytic species for hydroformylation is 1. 2. 3. 4. 44. Gold Ruthenium Iron Copper reduce streaming motion of falling mercury drop increase Id increase E1/2 eliminate residual current The element that shows both +3 and +4 oxidation states is: 1. 2. 3. 4. Cerium Promethium Gadolinium Holmium 47. The number of 3c, 2e BHB bonds present in B4H10 is 1. 2. 3. 4. 48. In BrF3 as a solvent SnF4 and KF behave as 1. 2. 3. 4. 49. O 2 + < O2 < O 2 O 2 < O2 < O 2 + O 2 < O 2+ < O2 O 2 + < O2 < O 2 CO bond order is lowest in 1. 2. 3. 4. 52. 4.55 3.45 7.65 5.45 Among the species O2+, O2 and O2 , the order of first ionization energy is 1. 2. 3. 4. 51. acid and base, respectively base and acid, respectively acids bases The effective nuclear charge (Z*) for the 1s electron of 8O according to Slater s rules is nearly 1. 2. 3. 4. 50. 2 3 4 0 uncoordinated CO CO bonded to one metal CO bridging two metals CO bridging three metals The most unstable species among the following is 1. 2. 3. 4. Ti(C2H5)4 Ti(CH2Ph)4 Pb(CH3)4 Pb(C2H5)4 53. In which of the following species quadrupole bonding is involved? 1. 2. 3. 4. 54. In which one of the following pairs the species have similar geometry? 1. 2. 3. 4. 55. One electron donor Two electron donor Three electron donor Four electron donor Among the following molecules, the dipole moment is the highest for 1. 2. 3. 4. 58. 1 and 3 2 and 2 3 and 1 2 and 3 In linear metal nitrosyls NO acts as a/an: 1. 2. 3. 4. 57. CO2 and SO2 NH3 and BH3 CO32 and SO32 SO42 and ClO4 On oxidative addition of O2 to Ir(CO)Cl(PPh3)2, the oxidation state and coordination number of Ir changes, respectively, by 1. 2. 3. 4. 56. Mo2(NMe2)6 Mn2(CO)10 Fe2(CO)9 Re2Cl82- NH3 trans-[PtCl2(NH3)2] BF3 NF3 An element 'X' emits successively two particles, one particle, one positron and one neutron. The mass and atomic numbers of the element are decreased by, respectively, 1. 2. 3. 4. 4 and 1 5 and 1 3 and 2 3 and 1 59. The 1H NMR spectrum of ( 5-C5H5)2Fe recorded at room temperature has 1. 2. 3. 4. 60. In the estimation of Fe2+ by Cr2O72 using barium diphenylamine sulfonate as indicator, H3PO4 is added to 1. 2. 3. 4. 61. 3. 4. all are three dimensional silicates feldspar and zeolite are three dimensional, while muscovite mica is layered feldspar is three dimensional, while zeolite and muscovite mica are layered all are layered silicates The molar absorptivity at max is minimum for 1. 2. 3. 4. 64. three dimensional conductor two dimensional conductor insulator one dimensional conductor Among feldspar, muscovite mica and zeolite, 1. 2. 63. maintain the pH of the medium decrease the Fe2+/3+ potential increase the oxidizing power of Cr2O72 stabilize the indicator The polymeric species (SN)n is a / an 1. 2. 3. 4. 62. One singlet One multiplet Two singlets Two multiplets [Mn(H2O)6]2+ [Cr(H2O)6]2+ [Co(H2O)6]2+ [Fe(H2O)6]2+ The acid catalyzed hydrolysis of trans-[Co(en)2AX]n+ can give cis- product also due to the formation of 1. 2. 3. 4. square pyramidal intermediate trigonal bipyramidal intermediate pentagonal bipyramidal intermediate face capped octahedral intermediate 65. The total number of lines expected in 1H NMR spectrum of HPF2 is (I = 1/2 for both 19F and 31P) 1. 2. 3. 4. 66. In the inner sphere reduction of [Co(NH3)5Cl]2+ with [Cr(OH2)6)]2+, the chloride 1. 2. 3. 4. 67. N 3 and hydrozine N2 and azobenzene N 3 and azobenzene N2 and hydrazine O2 can be converted to O + by using 2 1. 2. 3. 4. 70. 15 and 15 10 and 15 10 and 10 15 and 10 Among N2, N 3 , azobenzene and hydrazine, the shortest and longest N N distances are found, respectively, in 1. 2. 3. 4. 69. bridges the metal centres only mediates electron transfer only bridges and mediates electron transfer both does not play any role The number of faces and edges in IF7 polyhedron are, respectively 1. 2. 3. 4. 68. six four five three PtF6 KF Na2S2O3 Br2 Only one absorption band is observed in visible region of spectrum of 1. 2. 3. 4. [Ni(H2O)6]2+ [Ti(H2O)6]3+ [Fe(CN)6]4 VO34 71. CFSE of transition metal complexes can be determined by 1. 2. 3. 4. 72. Which two among [Fe(CN)6]3 , [FeF6]3 , [Cu(bpy)2]2+ (bpy = 2,2'-bipyridine) and [Mn(acac)3] (acac = acetylacetonate anion) show the same spin-only magnetic moment? 1. 2. 3. 4. 73. < 0 > 0 = 0 S = 0 The unit of rate constant (k) for a zero-order reaction is 1. 2. 3. 4. 76. S4O62 SO42 S2O62 S2O42 An exothermic reaction will necessarily follow the condition 1. 2. 3. 4. 75. [Fe(CN)6]3 and [FeF6]3 [Fe(CN)6]3 and [Cu(bpy)2]2+ [FeF6]3 and [Mn(acac)3] [Cu(bpy)2]2+ and [Mn(acac)3] In aqueous medium a mixture of KI and I2 converts thiosulfate to 1. 2. 3. 4. 74. UV-visible spectroscopy IR spectroscopy Microwave spectroscopy NMR spectroscopy s-1 L mol-1 s-1 s mol L-1 s-1 Heating is observed when N2 gas at 200 atm is expanded at T > 600 K. It is because 1. 2. 3. 4. inversion temperature is smaller than 600 K N2 is a real gas Joule-Thomson coefficient is negative Joule-Thomson coefficient is positive 77. Increase in disorder is more if 1. 2. 3. 4. 78. The term symbol of Li + with configuration (1 g)2(1 u)2(2 g)1 is 2 1. 2. 3. 4. 79. 2. 3. 4. + 1 2 2 g g g + g ln K ln K ln K ln K = (nFE o / RT ) = (nFE o / RT ) = ( RT / nFE o ) = ( RT / nFE o ) 2n octahedral and n tetrahedral sites n octahedral and n tetrahedral sites 2n octahedral and 2n tetrahedral sites n octahedral and 2n tetrahedral sites The point group symmetry of the molecule CH2Cl2 is 1. 2. 3. 4. 82. Cubic close packing of n spheres generates the following number of interstitial sites 1. 2. 3. 4. 81. 1 Which one of the following equations is used for the calculation of equilibrium constant (K) of an electrochemical cell reaction (n = number of electrons transferred, F = Faraday constant and E = standard redox potential)? 1. 80. heat is absorbed reversibly at higher temperature heat is absorbed reversibly at lower temperature heat absorbed reversibly is independent of temperature heat absorbed reversibly is independent of phase of the system. C2h C2v D2h D2d The point group symmetries of isosceles and equilateral triangles respectively are 1. 2. 3. 4. C3v and D2d D3h and D2d D3h and C2v C3v and C2v 83. The infrared spectrum of CO2 exhibits the following number of absorptions: 1. 2. 3. 4. 84. The first line in the rotational Raman spectra of a diatomic molecule appears with a Stokes shift of 12 cm 1. The Stokes shift for the second line is 1. 2. 3. 4. 85. 10 cm 1 20 cm 1 5 cm 1 15 cm 1 Overtones are observed in the vibrational spectra of diatomic molecules when 1. 2. 3. 4. 88. H 2O O2 H2O2 CO2 The R branch in the vibrational spectra of AX exhibits a set of equally spaced lines with a separation of 10 cm 1. The rotational constant of AX is 1. 2. 3. 4. 87. 36 cm 1 24 cm 1 18 cm 1 20 cm 1 Which of the following molecules shows EPR resonance? 1. 2. 3. 4. 86. one two three four anharmonicity is large anharmonicity is absent vibration and rotational modes are coupled an alternating electric field is applied Which of the following electronic transitions is disallowed? 1. 2. 3. 4. n 89. If the Carnot cycle in entropy-temperature diagram looks as below, T D C A B S then the system rejects heat to the surroundings in going from 1. 2. 3. 4. 90. The correlation coefficient (x, y) for two variables x and y satisfies 1. 2. 3. 4. 91. equal to gradually decreasing gradually decreasing to equal equal to gradually increasing gradually increasing to equal For a one-electron atom with nuclear charge Z, the speed vn of the electron in some n-th stationary orbit satisfies 1. 2. 3. 4. 93. 1 (x, y) 1 1 < (x, y) < 1 0 (x, y) 1 0 < (x, y) < 1 When we introduce anharmonicity in the harmonic vibrator model of a diatomic molecule, the energy-level spacing changes from 1. 2. 3. 4. 92. B A A B D C C D vn vn vn vn Z Z2 Z 1 Z 2 The optimized variational wavefunction gives 1. 2. 3. 4. all properties and energy of same quality properties better than the energy energy better than properties equal kinetic and potential energy values 94. The commutator [Ly, Lx] has a value equal to 1. 2. 3. 4. 95. The following statement is true for any hermitian operator: 1. 2. 3. 4. 96. n=3 =2 =2 m =2 The 2px hydrogenic orbital has the -part in its wavefunction of the form 1. 2. 3. 4. 98. All eigenvalues are real and non-degenerate All eigenfunctions are real All eigenfunctions are complex All eigenvalues are real A molecular orbital of a diatomic molecule is defined by 1. 2. 3. 4. 97. zero iLZ i LZ LZ e i e+i sin cos Which of the following statements about valence bond (VB) and molecular orbital (MO) theory is false? 1. 2. 3. 4. The VB uses non-orthogonal basis. The simple MO theory does not include any ionic terms. The VB theory views molecules as composed of atomic cores and bonding valence electrons. The MOs can be delocalized over all the atoms. 99. d If A an operator and A = i , then A 2 is given by dx 1. 2. 3. 4. 100. d dx d 2 2 2 dx 2 2 2 If all the energy-levels of a system are given a constant shift by an amount , the entropy of the system 1. 2. 3. 4. 101. d 2 dx d 2 2 2 dx does not change at all changes by the amount of decreases increases, but irregularly An equimolar mixture of two macromolecules of molar masses 10,000 and 30,000 will have the number average molar mass equal to: 1. 2. M n = 15,000 3. M n = 20,000 4. 102. M n = 10,000 M n = 25,000 Addition of a positive catalyst to an exothermic reaction 1. 2. 3. 4. 103. increases exothermicity and activation barrier decreases exothermicity, but increases barrier increases exothermicity only decreases activation barrier, but does not change the exothermicity. The electrical conductivity of a crystalline solid increases with temperature. The solid is a 1. 2. 3. 4. superconductor metal semiconductor semimetal 104. Ksp values for CuS, FeS, PbS and ZnS are 8.5 10 45, 6.3 10 18, 3.4 10 28 and 1.6 10 24, respectively. If H2S gas is passed through a solution containing these ions with same molar concentration, the ion that will precipitate first is 1. 2. 3. 4. 105. Pb2+ Zn2+ Fe2+ Cu2+ The experimental adsorption data of a gas on a solid surface at temperature T exhibits the following variation with pressure. V is the volume of gas adsorbed. 1/V 1/P Which of the following statements is true? 1. 2. 3. 4. 106. The second order Bragg diffraction from the 100 planes of a cubic crystal is equivalent to 1. 2. 3. 4. 107. Heat of coverage varies linearly with temperature Adsorption is multilayer Heat of adsorption is independent of coverage Complete coverage cannot be determined the second order diffraction from the 200 planes first order diffraction from the 200 planes first order diffraction from the 400 planes first order diffraction from the 100 planes IUPAC name of the compound given below is COOH 1. 2. 3. 4. 4-methylcyclohex-4-enecarboxylic acid 4-methylcyclohex-3-enecarboxylic acid 1-methylcyclohexene-4-carboxylic acid 2-methylcyclohexene-5-carboxylic acid 108. The major product formed in the reaction given below is i. NH2OH CHO 1. NC 2. NHCHO CONH2 3. 4. 109. CN Cope rearrangement involves 1. 2. 3. 4. 110. ii. P2O5 [1,5]-sigmatropic rearrangement [4+2]-cycloaddition reaction [3,3]-sigmatropic rearrangement 6 -electrocyclisation reaction The major product formed in the reaction given below is O Cl NH2NH2 KOH Cl 1. 2. O 3. NHNH2 COOH 4. 111. The stereochemical descriptors for the chiral centre and olefin in the compound given below, are O 2 H HO 1. 2. 3. 4. 112. Me 4 H 4R, 2Z 4S, 2Z 4R, 2E 4S, 2E In the compound given below, the hydrogens HA and HB are HA HB OH 1. 2. 3. 4. 113. An organic compound with molecular formula C3H6Cl2 exhibits only one signal in the 1H NMR spectrum. The compound is 1. 2. 3. 4. 114. homotopic enantiotopic diastereotopic isotopic 2,2-dichloropropane 1,2-dichloropropane 1,3-dichloropropane 1,1-dichloropropane The order of max in the UV-Vis spectra for the compounds A-C is A 1. 2. 3. 4. 115. B C A>B>C B>A>C B>C>A C>B>A The photochemical Paterno-B chi reaction is a cycloaddition between 1. 2. 3. 4. two >C=C< groups a >C=O and >C=C< groups a >C=N-R and >C=C< groups a >C=S and >C=C< groups 116. The reaction given below is an example of O + O O O O 1. 2. 3. 4. 117. 4s + 2s cycloaddition 4s + 2a cycloaddition 4a + 2s cycloaddition 4a + 2a cycloaddition Which one among the dienes A-D will undergo [3,3]-sigmatropic shift upon heating A 1. 2. 3. 4. 118. O B C A B C D The LUMO of the ground state buta-1,3-diene is 1. 2. 3. 4. D 119. The major product formed in the reaction given below is OH 1. EtOH / OTs 2. O 3. OTs CHO 4. 120. OTs The transformation given below can be achieved using O 1. 2. 3. 4. 121. The base peak in the electron impact mass spectrum (EI MS) of acetophenone is 1. 2. 3. 4. 122. BH3.THF followed by H2O2 / NaOH alkaline KMnO4 / NaIO4 pyridinium chlorochromate PdCl2 / CuCl2 / O2 / H2O 120 105 77 65 In the reaction given below, the orientation of two bromine substituents in the product is Br2 Br 1 2 Br 1. 2. 3. 4. equatorial at both C-1 and C-2 equatorial at C-1 and axial at C-2 axial at C-1 and equatorial at C-2 axial at both C-1 and C-2 123. Cyclohexyl benzyl ether is converted to cyclohexanol using 1. 2. 3. 4. 124. 5% aq. KOH hydrazine hydrate H2-Pd/C tetrabutylammonium fluoride Which one among the compounds A-D will have highest dipole moment? CC A 1. 2. 3. 4. 125. A B C D o-nitroaniline and o-nitroacetanilide m-nitroaniline and p-nitroacetanilide p-nitroaniline and m-nitroacetanilide m-nitroaniline and m-nitroacetanilide Wittig reaction Grignard reaction Dieckmann condensation Diels-Alder reaction The order of nucleophilicity among PhNH2, EtNH2 and PhNHNH2 is 1. 2. 3. 4. 128. D Which one of the following name reactions is an example of atom economy reaction? 1. 2. 3. 4. 127. C The major products formed in the nitration (HNO3 / H2SO4) of aniline and acetanilide are 1. 2. 3. 4. 126. B PhNHNH2 > PhNH2 > EtNH2 EtNH2 > PhNH2 > PhNHNH2 PhNHNH2 > EtNH2 > PhNH2 EtNH2 > PhNHNH2 > PhNH2 The order of acid strengths of CH3COOH, CF3COOH and CCl3COOH is 1. 2. 3. 4. CCl3COOH > CF3COOH > CH3COOH CCl3COOH > CH3COOH > CF3COOH CF3COOH > CCl3COOH > CH3COOH CF3COOH > CH3COOH > CCl3COOH 129. The major product formed in the reaction given below is Me i. ozonolysis ii. NaOH Me O 1. O 2. Me 3. 4. 130. O O The most suitable reagent to achieve the transformation, given below, is OH O HO 1. 2. 3. 4. 131. An optically active compound A having molecular formula C6H12 on catalytic hydrogenation gives an optically inactive compound (C6H14). The compound A is 1. 2. 3. 4. 132. HO CrO3 / H2SO4 MnO2 KMnO4 / H+ RuCl3 / NaIO4 2-methylpentene 3-methylpentene 3,3-dimethylbutene 4-methylpentene The reagent suitable for converting oct-4-yne to trans-oct-4-ene is 1. 2. 3. 4. H2 Pd/C Pd / CaCO3 / H2 NaBH4 Na / liq. NH3 133. Which one of the following is a polar aprotic solvent? 134. 1. toluene 2. carbon tetrachloride N,N-dimethylformamide 3. 4. acetic acid The major product formed in the reaction, given below, is N OH PCl5 Cl MeO O NH 1. Cl O OMe NH 2. MeO Cl O NH 3. Cl Cl O NH 4. 135. MeO OMe The major product formed in the reaction, given below, is CN i. EtMgBr ii. H3O+ 1. 2. 3. CHO O NH2 CN 4. 136. The most suitable reagent for carrying out the transformation given below, is OH Me 1. 2. 3. 4. 137. Me aq. H2SO4 Hg(OAc)2 followed by reaction with NaBH4 / NaOH B2H6 followed by reaction with H2O2 / NaOH m-CPBA followed by reaction with dil H2SO4 Natural product abietic acid, given below, is a COOH 1. 2. 3. 4. 138. monoterpene sesquiterpene diterpene triterpene The major product formed in the reaction of ethyl acetoacetate with sodium hydride (1 equivalent) and methyl iodide (1 equivalent) is O O 1. OEt Me 2. O O Me OEt 3. MeO O OEt O 4. O 139. The reaction of phenylacetylene with one equivalent of methylmagnesium bromide followed by reaction with benzaldehyde provides 1. OH Ph OH 2. Me Ph Ph 3. Ph Me H H Ph Ph HO 4. 140. Ph Me Sucrose is a disaccharide consisting of 1. 2. 3. 4. glucose and glucose glucose and galactose glucose and fructose glucose and mannose

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Additional Info : CSIR UGC (National Eligibility Test) NET New Exam Scheme December 2008 Model Question Paper - Chemical Sciences Paper I Joint CSIR UGC NET Exam Question Papers
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