AIEEE–Past papers<br />CHEMISTRY- UNSOLVED PAPER - 2004<br />
SECTION – A<br />Single Correct Answer Type<br />There are five parts in this question. Four choices are given for each pa...
01<br />Problem<br /> Which of the following sets of quantum numbers is correct for an electron in 4f orbital ? <br /> <br...
Problem<br />02<br />Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthally quantum ...
Problem<br />03<br />Which one of the following ions has the highest value of ionic radius ? <br /> <br />Li+<br />B3+<br ...
Problem<br />04<br />The wavelength of the radiation emitted when in a hydrogen atom electron falls from infinity to stati...
Problem<br />05<br />The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is : <br /> <br />H2S < S...
Problem<br />06<br />Which one of the following sets of ions represents the collection of isoelectromic species <br /> <br...
Problem<br />07<br />Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is : <br /> <br />SO2 < P2O3 < SiO...
Problem<br />08<br />The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for the...
Problem<br />09<br />The formation of the oxide ion O2- (g) requires first an exothermic and then an endothermic step as s...
Problem<br />10<br />The sates of hybridization of boron and oxygen atoms in boric acid (H3BO3) are respectively : <br /> ...
Problem<br />11<br />Which one of the following has the regular tetrahedral structure ? <br /> <br />XeF4<br />SF4<br />BF...
Problem<br />12<br />Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by...
Problem<br />13<br />As the temperature is raised from 200C to 400C the average kinetic energy of neon atoms changes by a ...
Problem<br />14<br />The maximum number of 900 angles  between bond pair-bond pair of electrons is observed in : <br /> <b...
Problem<br />15<br />Which one of the following aqueous solutions will exhibit highest boiling point ? <br /> <br />0.01 M...
Problem<br />16<br />Which among the following factors is the most important in making fluorine the strongest oxidizing ag...
Problem<br />17<br />In van der Waals equation of state of the gas law, the constant ‘b’ is a measure of:<br /> <br />Inte...
Problem<br />18<br />The conjugate base of H2PO  is : <br /> <br />PO43-<br />P2O5<br />H3PO4<br />HPO42-<br />
Problem<br />19<br />6.02 x 1020 molecules of urea are present in 100 mL of its solution. The concentration of urea soluti...
Problem<br />20<br />To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0...
Problem<br />21<br />For which of the following parameters the structural isomers C2H5OH and CH3OCH3 would be expected to ...
Problem<br />22<br />Which of the following liquid pairs shows a positive deviation from Raoult’s law ?<br /> <br />Water ...
Problem<br />23<br />Which one of the following statements is false ? <br /> <br />Raoult’s law states that the vapour pre...
Problem<br />24<br />What type of crystal defect is indicated in the diagram below ? <br /> <br />Na+, Cl-, Na+, Cl-, Na+,...
Problem<br />25<br />An ideal gas expands in volume from 1 x 10-3 to  1 x 10-2 m3 at 300 K against  a constant pressure of...
Problem<br />26<br />In hydrogen-oxygen fuel cell, combustion of hydrogen occurs to : <br /> <br />Generate heat <br />Cre...
Problem<br />27<br />In a first order reaction, the concentration the reactant, decreases frm 0.8 M to 0.4 M in 15 minutes...
Problem<br />28<br />What is the equilibrium expression for the reaction  P4(s) + 5O2(g)  P4O10(s) ?<br /> <br />a.<br />b...
Problem<br />29<br />For the reaction, CO(g) + Cl2 (g) COCl2(g), the Kp/Kc is  equal to: <br /> <br />a.1/RT<br />b. RT<br...
Problem<br />30<br />The equilibrium constant for the reactions N2(g) + O2 (g)          2NO(g) at temperature T is 4 x 10-...
Problem<br />31<br />The rate equation for the reaction 2A + B-> C is fond to be :  are = k [A] [B].<br />The correct stat...
Problem<br />32<br />Consider the following E0 values : <br />Eo Fe3+/Fe2+ = +0.77V<br />EoSn2+/Sn = -0.14 V<br />Under st...
Problem<br />33<br />The molar solubility(in mol L-1) of a sparingly soluble salt MX4 is ‘s’ the corresponding solubility ...
Problem<br />34<br />The standard e.m.f. of a cell, involving one electron change is found to be 0.591 V at 250C. The equi...
Problem<br />35<br />The enthalpies of combustion of carbon and carbon monoxide are -393.5 and -283 kJ mol-1 respectively....
Problem<br />36<br />The limiting molar conductivities ^0 for NaCl, KBr and KCl are 126, 152 and 150 S cm2 mol-1 respectiv...
Problem<br />37<br />In a cell that utilizes the reaction Zn(s) + 2H (aq) -> Zn2+ (aq) + H2 (g) addition of H2SO4 to catho...
Problem<br />38<br />Which one of the following statements regarding helium is incorrect ? <br /> <br />It is used to fill...
Problem<br />39<br />Identify the correct statement regarding enzymes : <br /> <br />Enzymes are specific biological catal...
Problem<br />40<br />One mole of magnesium nitride on the reaction with an excess of water gives: <br /> <br />One mole of...
Problem<br />41<br />Which one of the following ores is best concentrated by froth-floatation method ? <br /> <br />Magnet...
Problem<br />42<br />Beryllium and aluminum exhibit many properties which are similar. But, the two elements differ in : <...
Problem<br />43<br />Aluminum chloride exists as dimmer, Al2Cl6 in solid state as well as in solution of non-polar solvent...
Problem<br />44<br />The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as rega...
Problem<br />45<br />The                         values for Cr, Mn, Fe and Co are -0.41, + 157,  + 0.77 and + 1.97 V respe...
Problem<br />46<br />Excess of KI reacts with CuSO4 solution and the Na2S2O3 solution is added to it. Which of the stateme...
Problem<br />47<br />Among the properties (A) reducing (B) oxidizing (C) complexing, the set of properties shown by CN- io...
Problem<br />48<br />The co-ordination number of a central metal atom in a complex is determined by <br /> <br />The numbe...
Problem<br />49<br /> Which one of the following complexes is an outer orbital complex ? <br /> <br />[Fe(CN)6]4-<br />[Mn...
Problem<br />50<br />Co-ordination compounds have great importance in biological systems. In this context which of the fol...
Problem<br />51<br />Cerkum (Z = 58) is an important member of the lanthanoids. Which of the following statements about ce...
Problem<br />52<br />Which one of the following has largest number of isomers ? <br /> <br />[Ru (NH3)4 Cl2]+<br />[Co (NH...
Problem<br />53<br />The correct order of magnetic moments (spin only values in B.M.) among the following is <br /> <br />...
Problem<br />54<br />Consider the following nuclear reactions :                                                           ...
Problem<br />55<br />The half-life of a radioisotope is four hours. If the initial mass of the isotope was 200 g. The mass...
Problem<br />56<br />The compound formed in the positive test for nitrogen with the Lasaigne solution of an organic compou...
Problem<br />57<br />The ammonia evolved from the treatment of 0.30 g of an organic compound of the estimation of nitrogen...
Problem<br />58<br />Which one of the following has the minimum boiling point ? <br /> <br />n-butane <br />1-butyne <br /...
Problem<br />59<br />The IUPAC name of the compound <br /> <br />3,3-dimethyl-1-hydroxy cyclohexane<br />1,1-dimethyl-3-hy...
Problem<br />60<br />Which one of the following does not have sp2hybridised carbon ? <br /> <br />Acetone <br />Acetic aci...
Problem<br />61<br />Which of the following will have a meso-isomer also ? <br /> <br />2-chlorobutane<br />2,3-dichlorobu...
Problem<br />62<br />Rate of the reaction <br />Is fastest when Z is : <br /> <br />Cl<br />NH2<br />OC2H5<br />OCOCH3<br />
Problem<br />63<br />Amongst the following compounds, the optically active alkane having lowest molecular mass is :<br />
Problem<br />64<br />Consider the acidity of the carboxylic acids:<br />PhCOOH<br />o-NO2C6H4COOH<br />p-NO2C6H4COOH<br />...
Problem<br />65<br />which of the following is the strongest base ?<br />
Problem<br />66<br />Which base is present in RNA but not in DNA ? <br /> <br />Uracil<br />Cytosine <br />Guanine <br />T...
Problem<br />67<br />The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric a...
Problem<br />68<br />On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is : ...
Problem<br />69<br />Acetyl bromide reacts with excess of CH3MgI followed by treatment with a saturated solution of NH4Cl ...
Problem<br />70<br />Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydro...
Problem<br />71<br />Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the correspo...
Problem<br />72<br />Among the following compounds which can be dehydrated very easily ? <br />
Problem<br />73<br />Which of the following compounds is not chiral ? <br /> <br />1-chloropentane <br />2-chloropentane <...
Problem<br />74<br />Insulin production and its action in human body are responsible for the level of diabetes this compou...
Problem<br />75<br />The smog is essentially caused by the presence of : <br /> <br />O2 and O3<br />O2 and N2<br />Oxides...
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  • Aieee Chemistry 2004

    1. 1. AIEEE–Past papers<br />CHEMISTRY- UNSOLVED PAPER - 2004<br />
    2. 2. SECTION – A<br />Single Correct Answer Type<br />There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate<br />
    3. 3. 01<br />Problem<br /> Which of the following sets of quantum numbers is correct for an electron in 4f orbital ? <br /> <br />n = 4, l = 3, m = + 4, s = + 1/2<br /> n = 4, l = 4, m = - 4, s = - 1/2<br />n = 4, l = 3, m = + 1, s = + 1/2<br />n = 3, l = 2, m = -2, s = + ½<br />
    4. 4. Problem<br />02<br />Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthally quantum numbers, l = 1 and 2 are, respectively : <br /> <br />12 and 4<br />12 and 5<br />16 and 4<br />16 and 5<br />
    5. 5. Problem<br />03<br />Which one of the following ions has the highest value of ionic radius ? <br /> <br />Li+<br />B3+<br />O2-<br />F-<br />
    6. 6. Problem<br />04<br />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) :<br /> <br />91 mm<br />192 mm<br />406 nm<br />9.1 x 10-8 nm<br />
    7. 7. Problem<br />05<br />The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is : <br /> <br />H2S < SiH4 < NH3 < BF3<br />NH3 < H2S < SiH4 < BF3<br />H2S < NH3 < SiH4 < BF3<br />H2S < NH3 < BF3 < SiH4<br />
    8. 8. Problem<br />06<br />Which one of the following sets of ions represents the collection of isoelectromic species <br /> <br />K+, Ca2+, Sc3+, Cl-<br />Na+, Ca2+, Sc3+, F-<br />K+, Cl-, Mg2+, Sc3+<br />Na+, Mg2+, Al3+, Cl-<br />(Atomic numbers F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)<br />
    9. 9. Problem<br />07<br />Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is : <br /> <br />SO2 < P2O3 < SiO2 < Al2O3<br />SiO2 < SO2 < Al2O3 < P2O3<br />Al2O3 < SiO2 < SO2 < P2O3<br />Al2O3 < SiO2 < P2O3 < SO2<br />
    10. 10. Problem<br />08<br />The bond order in NO is 2.5 while that in NO+ is 3. Which of the following statements is true for these two species ?<br /> <br />Bond length in NO+ is greater than in NO<br />Bond length in NO is greater than in NO+<br />Bond length in NO+ is equal to that in NO<br />Bond length is unpredictable <br />
    11. 11. Problem<br />09<br />The formation of the oxide ion O2- (g) requires first an exothermic and then an endothermic step as shown below.<br />O(g) + e- = O-(g) ; ∆H0 = - 142 kJmol-1<br />O(g)- + e- = O2-(g) ; ∆H0 = 844 kJ mol-1<br />This is because : <br />Oxygen is more electronegative <br />Oxygen has high electron affinity <br />O- ion will tend to resist the addition of another electron <br />O- ion has comparatively larger size than oxygen atom <br />
    12. 12. Problem<br />10<br />The sates of hybridization of boron and oxygen atoms in boric acid (H3BO3) are respectively : <br /> <br />sp2 and sp2<br />sp2 and sp3<br />sp3 and sp2<br />sp3 and sp3<br />
    13. 13. Problem<br />11<br />Which one of the following has the regular tetrahedral structure ? <br /> <br />XeF4<br />SF4<br />BF <br />[Ni(CN)4]2-<br />(Atomic numbers B = 5, S = 16, Ni = 28, Xe = 54)<br />
    14. 14. Problem<br />12<br />Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them ?<br /> <br />(n - 1)d8 ns2<br />(n - 1)d5 ns1<br />(n - 1)d3 ns2<br />(n - 1)d5 ns2<br />
    15. 15. Problem<br />13<br />As the temperature is raised from 200C to 400C the average kinetic energy of neon atoms changes by a factor of which of the following ? <br /> <br />a. ½<br />b. <br />c. 313/293<br />d. 2<br />
    16. 16. Problem<br />14<br />The maximum number of 900 angles between bond pair-bond pair of electrons is observed in : <br /> <br />dsp3 hybridization<br />sp3d hybridization<br />dsp2 hybridization<br />sp3d2 hybridization<br />
    17. 17. Problem<br />15<br />Which one of the following aqueous solutions will exhibit highest boiling point ? <br /> <br />0.01 M Na2SO4<br />0.01 M KNO3<br />0.015 M urea <br />0.015 M glucose <br />
    18. 18. Problem<br />16<br />Which among the following factors is the most important in making fluorine the strongest oxidizing agent ? <br /> <br />Electron affinity <br />Ionization enthalpy <br />Hydration enthalpy <br />Bond dissociation energy <br />
    19. 19. Problem<br />17<br />In van der Waals equation of state of the gas law, the constant ‘b’ is a measure of:<br /> <br />Intermolecular repulsions <br />Intermolecular attraction <br />Volume occupied by the molecules <br />Intermolecular collisions per unit volume <br />
    20. 20. Problem<br />18<br />The conjugate base of H2PO is : <br /> <br />PO43-<br />P2O5<br />H3PO4<br />HPO42-<br />
    21. 21. Problem<br />19<br />6.02 x 1020 molecules of urea are present in 100 mL of its solution. The concentration of urea solution is : <br /> <br />0.001 M<br />0.01 M<br />0.02 M<br />0.1 M<br />(Avogadro constant, NA = 6.02 x 1023 mol-1)<br />
    22. 22. Problem<br />20<br />To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is : <br /> <br />10 mL<br />20 mL<br />40 mL<br />60 mL<br />
    23. 23. Problem<br />21<br />For which of the following parameters the structural isomers C2H5OH and CH3OCH3 would be expected to have the same values ? (Assume ideal behaviour) : <br /> <br />Heat of vaporization <br />Vapour pressure at the same temperature <br />Boiling points <br />Gaseous densities at the same temperatures and pressure <br />
    24. 24. Problem<br />22<br />Which of the following liquid pairs shows a positive deviation from Raoult’s law ?<br /> <br />Water - hydrochloric acid <br />Benzene - methanol <br />Water - nitric acid <br />Acetone - chloroform <br />
    25. 25. Problem<br />23<br />Which one of the following statements is false ? <br /> <br />Raoult’s law states that the vapour pressure of a component over a solution is proportional to its mole fraction <br />The osmotic pressure ( ) of a solution is given by the equation = MRT, where M is the molarity of the solution <br />The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl2 > KCl > CH3COOH > sucrose <br />Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression<br />
    26. 26. Problem<br />24<br />What type of crystal defect is indicated in the diagram below ? <br /> <br />Na+, Cl-, Na+, Cl-, Na+, Cl-<br /> <br />Frenkel defect <br />Schottky defect <br />Interstitial defect <br />Frenkel and Schottky defects <br />
    27. 27. Problem<br />25<br />An ideal gas expands in volume from 1 x 10-3 to 1 x 10-2 m3 at 300 K against a constant pressure of 1 x 105 Nm-2. The work done is : <br /> <br />- 900 J<br />- 900 kJ<br />270 kJ<br />900 kJ<br />
    28. 28. Problem<br />26<br />In hydrogen-oxygen fuel cell, combustion of hydrogen occurs to : <br /> <br />Generate heat <br />Create potential difference between the two electrodes <br />Produce high purity water <br />Remove adosred oxygen from electrode surfaces <br />
    29. 29. Problem<br />27<br />In a first order reaction, the concentration the reactant, decreases frm 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is : <br /> <br />30 min<br />15 min<br />7.5 min<br />60 min<br />
    30. 30. Problem<br />28<br />What is the equilibrium expression for the reaction P4(s) + 5O2(g) P4O10(s) ?<br /> <br />a.<br />b.<br />c. KC = [O2]5<br />d.<br />
    31. 31. Problem<br />29<br />For the reaction, CO(g) + Cl2 (g) COCl2(g), the Kp/Kc is equal to: <br /> <br />a.1/RT<br />b. RT<br />c. <br />d. 1.0<br />
    32. 32. Problem<br />30<br />The equilibrium constant for the reactions N2(g) + O2 (g) 2NO(g) at temperature T is 4 x 10-4. The value Kc for the reaction : at the same temperature is : <br /> <br />2.5 x 102<br />50<br />4 x 10-4<br />0.02<br />
    33. 33. Problem<br />31<br />The rate equation for the reaction 2A + B-> C is fond to be : are = k [A] [B].<br />The correct statement in relation to this reaction is that the :<br /> <br />Unit of k must be s-1<br />t1/2 is a constant <br />rate of formation of C is twice the rate of disappearance of A <br />value of k is independent of the initial concentrations of A and B<br />
    34. 34. Problem<br />32<br />Consider the following E0 values : <br />Eo Fe3+/Fe2+ = +0.77V<br />EoSn2+/Sn = -0.14 V<br />Under standard conditions the potential for the reaction <br />Sn(s) + 2Fe3+(aq) 2Fe2+ (aq) + Sn2+ (aq) is : <br /> <br />1.68 V<br />1.40 V<br />0.91 V<br />0.63 V<br />
    35. 35. Problem<br />33<br />The molar solubility(in mol L-1) of a sparingly soluble salt MX4 is ‘s’ the corresponding solubility product is Ksp. s is given in terms of Ksp by the relation :<br /> <br />s = (Ksp/128)1/4<br />s = (128 Ksp)1/4<br />s = (256 Ksp)1/5<br />s = (Ksp/256)1/5<br />
    36. 36. Problem<br />34<br />The standard e.m.f. of a cell, involving one electron change is found to be 0.591 V at 250C. The equilibrium constant of the reaction is (F = 96,500 C mol-1, R = 8.314 JK-1 mol-1) :<br /> <br />1.0 x 101<br />1.0 x 105<br />1.0 x 1010<br />1.0 x 1030<br />
    37. 37. Problem<br />35<br />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<br />110.5 kJ <br />-110.5 kJ<br /> -676.5 kJ <br /> 676.5 kJ<br />
    38. 38. Problem<br />36<br />The limiting molar conductivities ^0 for NaCl, KBr and KCl are 126, 152 and 150 S cm2 mol-1 respectively. The ^0 for NaBr is : <br /> <br />128 S cm2 mol-1<br />176 S cm2 mol-1<br />278 S cm2 mol-1<br />302 S cm2 mol-1<br />
    39. 39. Problem<br />37<br />In a cell that utilizes the reaction Zn(s) + 2H (aq) -> Zn2+ (aq) + H2 (g) addition of H2SO4 to cathode compartment, will : <br /> <br />Lower the E and shift equilibrium to the left <br />Lower the E and shift the equilibrium to the right <br />Increase the E and shift the equilibrium to the right <br />Increase the E and shift the equilibrium to the left <br />
    40. 40. Problem<br />38<br />Which one of the following statements regarding helium is incorrect ? <br /> <br />It is used to fill gas balloons instead of hydrogen because it is lighter and non-inflammable <br />It is used as a cryogenic agent for carrying out experiments at low temperatures <br />It is used to produce and sustain powerful superconducting magnets <br />It is used in gas-cooled nuclear reactors <br />
    41. 41. Problem<br />39<br />Identify the correct statement regarding enzymes : <br /> <br />Enzymes are specific biological catalysts that can normally function at very high temperatures (T ~ 1000 K).<br />Enzymes are normally heterogeneous catalysts that are very specific in their action <br />Enzymes are specific biological catalysts that cannot be poisoned <br />Enzymes are specific biological catalysts that possess well defined active sites. <br />
    42. 42. Problem<br />40<br />One mole of magnesium nitride on the reaction with an excess of water gives: <br /> <br />One mole of ammonia <br />One mole of nitric acid <br />Two moles of ammonia <br />Two moles of nitric acid <br />
    43. 43. Problem<br />41<br />Which one of the following ores is best concentrated by froth-floatation method ? <br /> <br />Magnetite <br />Cassiterite<br />Galena <br />Malachite <br />
    44. 44. Problem<br />42<br />Beryllium and aluminum exhibit many properties which are similar. But, the two elements differ in : <br /> <br />Exhibiting maximum covalency in compounds <br />Forming polymeric hydrides<br />Forming covalent halides <br />Exhibiting amphoteric nature in their oxides <br />
    45. 45. Problem<br />43<br />Aluminum chloride exists as dimmer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene, when dissolved in water, it gives : <br /> <br />Al3+ + 3Cl-<br />[Al(H2O)6]3+ + 3Cl-<br />[Al(OH)6]3- + 3HCl<br />Al2O3 + 6HCl<br />
    46. 46. Problem<br />44<br />The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to : <br /> <br />A change in the crystalline structure of tin<br />An interaction with nitrogen of the air at very low temperatures<br />A change in the partial pressure of oxygen in the air<br />An interaction with water vapour contained in the humid air<br />
    47. 47. Problem<br />45<br />The values for Cr, Mn, Fe and Co are -0.41, + 157, + 0.77 and + 1.97 V respectively. For which one of these metals the change in oxidation state from + 2 to + 3 is easiest ? <br /> <br />Cr<br />Mn<br />Fe<br />Co<br />
    48. 48. Problem<br />46<br />Excess of KI reacts with CuSO4 solution and the Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction ? <br /> <br />Cu2I2 is formed <br />CuI2 is formed <br />Na2S2O3 is oxidized <br />Evolved I2 is reduced <br />
    49. 49. Problem<br />47<br />Among the properties (A) reducing (B) oxidizing (C) complexing, the set of properties shown by CN- ion towards metal species is : <br /> <br />A, B<br />B, C<br />C, A<br />A, B, C<br />
    50. 50. Problem<br />48<br />The co-ordination number of a central metal atom in a complex is determined by <br /> <br />The number of ligands around a metal ion bonded by sigma bonds <br />The number of ligands around a metal ion bounded by pi-bonds <br />The number of ligands around a metal ion bounded by sigma and pi-bonds both <br />The number of only anionic ligands bonded to the metal ion <br />
    51. 51. Problem<br />49<br /> Which one of the following complexes is an outer orbital complex ? <br /> <br />[Fe(CN)6]4-<br />[Mn(CN)6]4-<br />[Co(NH3)6]3+<br />[Ni(NH3)6]2+<br />(Atomic numbers Mn = 25, Fe = 36, Co = 27, Ni = 28)<br />
    52. 52. Problem<br />50<br />Co-ordination compounds have great importance in biological systems. In this context which of the following statements is incorrect ? <br />Chlorophylls are green pigments in plants and contain calcium <br />Haemoglobin is the red pigment of blood and contains iron <br />Cyanocobalamin is vitamin B12 and contains cobalt <br />Carboxypeptidase-A is an enzyme and contains zinc<br />
    53. 53. Problem<br />51<br />Cerkum (Z = 58) is an important member of the lanthanoids. Which of the following statements about cerium is incorrect ? <br /> <br />The common oxidation states of cerium are + 3 and + 4<br />The + 3 oxidation state of cerium is more stable than the + 4 oxidation state <br />The + 4 oxidation state of cerium is not known in solutions <br />Cerium (IV) acts as an oxidizing agent<br />
    54. 54. Problem<br />52<br />Which one of the following has largest number of isomers ? <br /> <br />[Ru (NH3)4 Cl2]+<br />[Co (NH3)5Cl]2+<br />[Ir(PR3)2 H(CO)]2+<br />[Co(en)2Cl2]+<br />(R = alkyl group, en = ethylenediamine)<br />
    55. 55. Problem<br />53<br />The correct order of magnetic moments (spin only values in B.M.) among the following is <br /> <br />[MnCl4]2- > [CoCl4]2- > [Fe(CN6)]4-<br />[MnCl4]2-> [Fe(CN6)]4-> [CoCl4]2-<br />Fe(CN6)]4- > [MnCl4]2- > [CoCl4]2-<br />[Fe(CN6)]4-> [CoCl4]2-> [MnCl4]2-<br />(Atomic numbers Mn = 25, Fe = 26, Co = 27)<br />
    56. 56. Problem<br />54<br />Consider the following nuclear reactions : The number of neutrons in he element L is :<br />142<br />144<br />140<br />146<br />
    57. 57. Problem<br />55<br />The half-life of a radioisotope is four hours. If the initial mass of the isotope was 200 g. The mass remaining after 24 hours undecided is :<br /> <br />1.042 g<br />2.084 g<br />3.125 g<br />4.167 g<br />
    58. 58. Problem<br />56<br />The compound formed in the positive test for nitrogen with the Lasaigne solution of an organic compound is : <br /> <br />Fe4[Fe(CN)6]3<br />Na3[Fe(CN)6]<br />Fe[Fe(CN)]3<br />Na4[Fe(CN)6NOS]<br />
    59. 59. Problem<br />57<br />The ammonia evolved from the treatment of 0.30 g of an organic compound of the estimation of nitrogen was passed in 100 mL, of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M sodium hydroxide solution of complete neutralization. The organic compound is : <br /> <br />Acetamide<br />Benzamide<br />Urea <br />Thiourea<br />
    60. 60. Problem<br />58<br />Which one of the following has the minimum boiling point ? <br /> <br />n-butane <br />1-butyne <br />1-butene <br />Isobutene <br />
    61. 61. Problem<br />59<br />The IUPAC name of the compound <br /> <br />3,3-dimethyl-1-hydroxy cyclohexane<br />1,1-dimethyl-3-hydroxy cyclohexane<br />3,3-dimethyl-1-cyclohexanol<br />1,1-dimethyl-3-cyclohexanol<br />
    62. 62. Problem<br />60<br />Which one of the following does not have sp2hybridised carbon ? <br /> <br />Acetone <br />Acetic acid <br />Acetonitrile<br />Acetamide<br />
    63. 63. Problem<br />61<br />Which of the following will have a meso-isomer also ? <br /> <br />2-chlorobutane<br />2,3-dichlorobutane<br />2, 3-dichloropentane <br />2- hydroxypropanoic acid <br />
    64. 64. Problem<br />62<br />Rate of the reaction <br />Is fastest when Z is : <br /> <br />Cl<br />NH2<br />OC2H5<br />OCOCH3<br />
    65. 65. Problem<br />63<br />Amongst the following compounds, the optically active alkane having lowest molecular mass is :<br />
    66. 66. Problem<br />64<br />Consider the acidity of the carboxylic acids:<br />PhCOOH<br />o-NO2C6H4COOH<br />p-NO2C6H4COOH<br />m-NO2C6H4COOH<br />
    67. 67. Problem<br />65<br />which of the following is the strongest base ?<br />
    68. 68. Problem<br />66<br />Which base is present in RNA but not in DNA ? <br /> <br />Uracil<br />Cytosine <br />Guanine <br />Thymine <br />
    69. 69. Problem<br />67<br />The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is : <br /> <br />Gammexene<br />DDT<br />Freon <br />Hexachloroethane<br />
    70. 70. Problem<br />68<br />On mixing ethyl acetate with aqueous sodium chloride, the composition of the resultant solution is : <br /> <br />CH3COOC2H5 + NaCl<br />CH3COONa + C2H5OH<br />CH3COCl + C2H5OH + NaOH<br />CH3Cl + C2H5COONa<br />
    71. 71. Problem<br />69<br />Acetyl bromide reacts with excess of CH3MgI followed by treatment with a saturated solution of NH4Cl gives : <br /> <br />Acetone <br />Acetamide<br />2-methyl-2-propanol<br />Acetyl iodide <br />
    72. 72. Problem<br />70<br />Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon ? <br /> <br />Ethyl acetate <br />Acetic acid <br />Acetamide<br />Butan-2-one <br />
    73. 73. Problem<br />71<br />Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid ? <br /> <br />Phenol <br />Benzaldehyde<br />Butananl<br />Benzoic acid <br />
    74. 74. Problem<br />72<br />Among the following compounds which can be dehydrated very easily ? <br />
    75. 75. Problem<br />73<br />Which of the following compounds is not chiral ? <br /> <br />1-chloropentane <br />2-chloropentane <br />1-chloro-2-methyl pentane <br />3-chloro-2-mehtyl pentane <br />
    76. 76. Problem<br />74<br />Insulin production and its action in human body are responsible for the level of diabetes this compound belongs to which of the following categories ? <br /> <br />A co-enzyme <br />Ahormone<br />An enzyme <br />An antibiotic <br />
    77. 77. Problem<br />75<br />The smog is essentially caused by the presence of : <br /> <br />O2 and O3<br />O2 and N2<br />Oxides of sulphur and nitrogen <br />O3 and N2<br />
    78. 78. FOR SOLUTION VISIT WWW.VASISTA.NET<br />

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