Aje Taiwo Tutor 1. 2. 3. 4. 5. FSC 102/DCHM101 (Introductory Chemistry) Which quantum number(s) do 2s and 2p orbitals have in common? (a) n (b) l and m (c) l (d) n and l Which set of quantum numbers define an electron in an atomic orbital with n=3 and l=1. (a) n=3, l=1, m=4, s=+½ (b) n=3, l=1, m=1, s=+1 (c) n=3, l=1, m=-1, s=+½ (d) n=3, l=1, m=-4, s=-½ Calculate the density of mercury if 1×102g of mercury occupies 7.36cm3. (a) 1.360×10-4 kgm-3 (b) 1.36×10-2 kgm-3 -3 (c) 1.36kgm (d) 1.36×10-3 kgm-3 A climber is at the base of a rock and he estimates the height of the rock to be 155ft. He has a rope that is 65metres long. Is it long enough to reach the top of the rock? (a) Yes (b) No (c) Maybe (d) None of the above If the temperature of a room taken by a student is 25.8ºC but the actual temperature is 25.6ºC. Calculate the relative error of the measurement (a) 7.8×10-4 (b) 0.078125 (c) 0.0078125 (d) 7.8×10-5 6. How many significant figures does 6.023×1023 have? (a) One (b) Two (c) Three (d) Four 7. From analysis of a compound, the percentage composition shows that it contains 75.7% carbon, 8.8% hydrogen, 15.5% oxygen. What is the molar mass? (a) 210 (b) 215 (c) 206 (d) 205 8. 3RT (b) M 3RT (c) M RT (d) 3M 3nRT M 3 2 KT (b) PV (c) PV 1 3 KT (d) PV KT 2 3 KT If the solubility product of Mg(OH)2 is 1.8×10-11 then its molar solubility in 0.10M MgCl2 is (a) 1.8×10-4M (b) 6.7×10-6M (c) 1.65×10-4M (d) 2.6×10-4M 14. What is the solubility of Zinc Phosphate Zn3(PO4)2 if its solubility product is 9.0×10-33 (a) 3.90×10-7M (b) 2.46×10-7M (c) 1.52×10-7M (d) 2.02×10-7M 15. Identify the most soluble compound below (a) BaSO4 (ksp=1.1×10-2) (b) Ag2SO4 (ksp=1.4×10-5) -5 (c) PbSO4 (ksp=1.6×10 ) (d) SrSO4 (ksp=3.2×10-7) 16. For the reaction PCl5( g ) PCL3( g ) Cl2( g ) : if the 17. Which of the following is unsuitable as stationary phase in column chromatography? (a) silica (b) silica gel (c) alumina (d) bauxite 18. The pH of a buffer solution containing 0.405M HCOOH and 0.326M HCOONa is [Ka = 1.8×10-4] (a) 3.65 (b) 3.74 (c) 3.83 (d) 3.64 19. What is the pKb of pyridine if Ka of its conjugate acid is 1.5×10-9 (a) 8.82 (b) 1.5×10-9 (c) 6.9×10-6 (d) 5.16 Calculate the temperature at which the root mean square The data below applies to questions 20-22. For reaction 2A + B → C + D; the following data was obtained [A]/m [B]/m initial rate/ms-1 0.22 0.16 6.1×10-4 0.44 0.16 1.2×10-3 0.44 0.32 2.4×10-3 0.22 0.32 1.2×10-3 [R=8.314JK-1mol-1, (a) 40K 11. (a) PV equilibrium quantities of PCl5(g), PCl3(g) and Cl2(g) are 0.562g, 1.950g and 1.007g respectively. [P = 31, Cl = 35.5]. The value of K for the reaction is (a) 13.37 (b) 3.49 (c) 0.0286 (d) 0.0748 Crms of ozone (O3) molecules is 1.50×103ms-1. 10. An equation derived for Boyle’s law from kinetic theory equation is 13. The expression for root mean square velocity, C, derived from ideal gas equation and kinetic equation is (a) 9. 12. Saturday 10th March, 2012. Molar mass of oxygen=16) (b) 100K (c) 75K (d) 50K A certain volume of gas at 30º heated such that its volume and pressure are now four times the original values. What is the new temperature? (a) 120ºC (b) 4848.0K (c) 4768.0K (d) 4800.0K The condition under which gases behave least ideally are (a) low temperature, low pressure (b) low temperature, high pressure (c) high temperature, low pressure (d) high temperature, high pressure Mock checks readiness for the real exam. 5 20. The order with respect to A and B is (a) 1, 2 (b) 2, 1 (c) 1, 1 (d) 0, 1 21. The rate law for the reaction is (a) rate = k [A] [B] (b) rate = k [A] [B]2 (c) rate = k [B] (d) rate = k [A]2 [B] 22. Rate constant of the reaction is Join us for the Revision Classes. Aje Taiwo Tutor FSC 102/DCHM101 (Introductory Chemistry) (a) 8.52 ×10-3 (c) 5.33×10-2 23. (c) Electron Affinity (d) None of the above 33. Benzene will undergo (a) Nucleophilic addition reaction (b) Electrophilic addition reaction (c) Electrophilic substitution reaction (d) Nucleophilic substitution reaction 34. Which of the following can be used for the isolation, purification and identification of the constituents of a mixture (a) Sublimation (b) Chromatography (c) Distillation (d) All of the above 35. Which of the following is not a mixture (a) Cement (b) Air (c) Seawater For the reaction N2 + 3H2 → 2NH3. Which expression represents the relationship between the rates at which H2 and N2 are consumed? (a) (c) 24. (b) 1.70×10-2 (d) 1.70×10-3 d H 2 d N 2 dt 3dt (b) d H 2 d N 2 dt 3dt (d) Saturday 10th March, 2012. d H 2 3d N 2 dt dt d H 2 d N 2 dt dt Calculate the number of moles of oxygen atoms in 1.64g of C22H24N2O8. (a) 3.69×10-3 moles (b) 3.69 moles (c) 0.0295 moles (d) 0.075 moles (d) Table sugar 36. Convert the following temperatures 68°F, 5°F, 176°F to centigrade (a) 20°C, -15°C, 80°C (b) 25°C, -20°C, 76°C (c) 12°C, -15°C, 82°C (d) 25°C, -20°C, 76°C 37. An electric plasma was reported to reach a temperature of 25,600°F, what is the ratio of this temperature to a flame with a temperature of 3500°C (a) 10.12 (b) 40.58 (c) 3.84 (d) 6.25 38. Analysis shows that 20.0mL of conc. HCl of density 1.18g/mL contains 8.36g of HCl. What is the percent by weight (mass) of HCl in the concentrated acid? (a) 27.1% HCl (b) 28.5% HCl (c) 36.5% HCl (d) 35.4% HCl 39. Calculate the percentage of C in Ca(HCO3)2 (a) 17.5% (b) 26.7% (c) 14.8% (d) 40.6% redox equation is balanced, the stoichiometric ratio of the reactants is (a) 5:1 (b) 2:3 (c) 2:1 (d) 4:1 40. A compound contains 93.91% and 6.29% H2. Its molecular weight is about 130g. What is its molecular formula (a) C7H20 (b) C9H20 (c) C12H4 (d) C10H8 29. The oxidation numbers of nitrogen in N2O and N2F (a) +1 and +2 (b) -2 and +2 (c) +1 and -1 (d) -2 and -3 41. How many grams of CaCl2 is produced when 14.3g of AgCl is treated with excess AgNO3? (Ag = 107, Cl = 35.5, O = 16, Ca = 40) (a) 9.25g (b) 5.57g (c) 7.5g (d) 4.5g 30. The number of significant figures that should be reported for the difference between 235.7631 and 235.57 is (a) 7 (b) 3 (c) 2 (d) 5 42. Calculate the mass of HCl in 5ml of concentrated HCl (Density = 1.1791mL) containing 37.23% HCl by weight (a) 6.35g (b) 2.22g (c) 1.37g (d) 3.50g 43. What is the molarity of NaOH in a solution with 24.0g NaOH in 300ml solution? (a) 6M (b) 2M (c) 3M (d) 7.5M 44. How many mL of water must be added to 200ml of 0.065M HCl to dilute the solution to 0.20M? (a) 500ml (b) 250ml (c) 400ml (d) 650ml 45. Which of the following is an odd electron molecule 25. Calculate the mass POBr3 that can be prepared from the reaction of 2.58g of PBr5 and 8.74g of P2O5 (P=31, Br=80, O=16) 3PBr5 P2O5 5POBr3 (a) 3.16g 26. 27. 28. 31. (b) 9.48g (c) 2.56g (d) 6.72g Calculate the number of atoms present in 2.25mg of potassium (K=39) (a) 1.35×1020 atoms (b) 2.75×1020 atoms (c) 3.47×1022 atoms (d) 3.17×1019 atoms Calculate the volume of 59.4% nitric acid that is required to prepare 250cm3 of 0.15M HNO3 (Density of HNO3 = 1.65gcm-3) (a) 2.98dm3 (b) 2.41dm3 (c) 0.65dm3 (d) 1.72dm3 In this redox equation I CrO4 I 2 Cr 3 when the The correct value of this expression is 1 10 1 10 1 10 280 4 230 270 (a) 1×10-340 32. (b) 1×10-200 1 3 (c) 1×10-290 (d) 1×20-180 Which of the following periodic properties increases across the period but decreases down the group (a) Atomic radius (b) Ionization potential Mock checks readiness for the real exam. 6 Join us for the Revision Classes. Aje Taiwo Tutor (a) CO 46. 47. FSC 102/DCHM101 (Introductory Chemistry) (b) NO (c) HBr (d) HI (d) the molecule is trigonal planar in shape Which of the following statements is incorrect about hydrogen bonding? (a) It occurs when hydrogen is covalently bonded to a highly electronegative element (b) It is responsible for the high boiling point of water (c) It exist in hydrogen containing compounds of oxygen, fluorine and nitrogen only (d) It exist in all hydrogen containing compounds 55. 56. Which group in periodic table form(s) tetrahedral chlorides? (a) Group II (b) Group III (c) Group IV (d) Group V 49. Which of the following relationships between the pressure P, the volume V, and the temperature T, represents an ideal gas behaviour? 50. 51. 52. (b) P T V (c) PT V (d) PV 57. The molecule BCl3 is considered unstable because (a) the molecule is an odd electron molecule (b) it does not exist as a solid (c) the central atom has an incomplete octet Mock checks readiness for the real exam. (b) butanol (d) 2-methylpropanol CH3COCH 2 CH 3 2 1 ? N /N (b) Butan-2-one (d) Pental-2-one CH 3CH 2CHOHC CH 3 2 is (a) 1,1 dimethylbutan-2-ol (c) 2,2, dimethyl butan-2-ol 59. Increasing order of (b) 2,2 dimethyl pentan-3-ol (d) Hexan-2-ol solubility of the following CHCHCOOH , CHCl2COOOH , CCl3COOH , is (a) 1>2>3 1 T 60. (b) 2>1>3 (c) 3>2>1 (d) 2>3>1 The term which described the heat content of a system at constant volume is (a) Entropy (b) Internal energy (c) Free energy (d) Enthalpy 61. The product of the above is (a) 2methyl butan-2-ene (c) 5-methyl butan-2-ene Hydrogen bonding causes (a) decrease in boiling point (b) increase in observed molecular weight (c) decrease in melting point (d) decrease in observed molecular weight 54. B H (a) Butan-2-ol (c) Pentan-2-ol A nucleophilic is a species that (a) attacks the nucleus of an atom (b) attacks the electron rich centre of an atom (c) acts as a free radical (d) is unreactive Which of the following has a triangular planar shape? (a) BF3 (b) PF3 (c) IF3 (d) NH3 2 6 CH3CHCH 2 ? (a) propanol (c) propa-2-nol Which of the following statements is not true about dispersion effects? (a) Dispersion effect are attractive forces between non-polar molecules (b) The attraction is strong when molecules are close together (c) Dispersion effect is not a permanent one (d) Dispersion effect provides a good correlation between molecular weight and boiling point 53. (b) propylethanoate (d) propylpropanoate H 2O2 / OH 58. 48. CH 3CH 2COO CH 2 2 CH 3 (a) 2, methylethanoate (c) ethylpropanoate The intermolecular forces that exist between the molecular of HCl are (a) London forces and dipole-dipole attraction (b) hydrogen bonding and London forces (c) Hydrogen bonding, dipole-dipole attraction (d) Dispersion force (a) P VT Saturday 10th March, 2012. 7 (b) 2-methyl hexan-3-ene (d) 3-methyl hexan-3-ene 62. Diagonal relationship is described by all but (a) Li and Mg (b) Be and Al (c) C and O (d) B and Si 63. Which of the following gas laws consider the chemical properties of gases (a) Gay Lussac’s (b) Graham (c) Charles (d) Boyle’s 64. The total pressure on a container containing 2.0moles of helium, 3.0moles of Nitrogen and 1.0 of CO2 is 18atm. The mole fraction of helium and partial pressure of Nitrogen are respectively (a) 2 6 moles, 8atm (c) 2 6 moles and 9atm (d) (b) 1 6 2 6 moles and 6atm moles and 3atm Join us for the Revision Classes. Aje Taiwo Tutor FSC 102/DCHM101 (Introductory Chemistry) 65. Which has the highest number of unpaired electron (a) N (b) C (c) O (d) F 66. S O2 SO2 (c) ln A1 ln A0 kt H xkg For a spontaneous reaction, (a) ∆H > T∆S (b) T∆S > ∆H (c) ∆G is positive (d) None 68. The entropy of a perfect crystal is zero at absolute zero of temperature is a statement of (a) 1st law of thermodynamics (b) 2nd law of thermodynamics (c) 3rd law of thermodynamics (d) 4th law of thermodynamics 69. Half life for the first order decomposition of naramide is 123mins at 15°C. How long would it take for a sample to be 85% decomposed? (a) 1.85min (b) 2.09min (c) 3.69min (d) 3.37min 77. When 0.05mol of CaCO3 is heated in air, it decomposes to CaO and CO2. If 8.90kJ of heat is absorbed, what will be the enthalpy change when 1mol of CaCO3 decomposes (a) 4.45kJmol-1 (b) 17.8kJmol-1 -1 (c) 44.5kJmol (d) 178kJmol-1 78. Use the following equation to determine the enthalpy change ∆H for the reaction 2 NO2 N 2 O4 Calcium nitrate reacts with anhydrous chloride at slightly elevated temperature 72. 73. Oxidization number of phosphorus in NaH2PO4 is (a) -2 (b) +1 (c) +5 (d) -3 75. (c) 42.4kJ (d) -24.0kJ 80. The combustion of thiopene C4H4S is represented by equation H 2523 kJ 81. If the heat released when 1.00g of calcium (Ca) reacts with 1.00g of hydrogen (H2) to give calcium hydride (CaH2) is 4.28kJ. The reaction enthalpy for the formation of one mole of CaH2 is (a) 199.2kJ (b) 9.96kJ (c) 179.8kJ (d) 206.6kJ 82. The standard state of a substance is the (a) pure form (b) most stable format 25°C and 1atm (c) most stable form at 0°C and 1atm (d) pure gaseous form at 25°C and 1atm 83. Identify the factor that influences the value of the equilibrium constant for a reversible reaction (a) catalyst (b) temperature (c) pressure (d) concentration of products 84. Which set of quantum numbers correspond to a 3p orbital? (a) n=3, l=2 (b) n=3, 1=3 (c) n=3, 1=0 (d) n=3, l=1 For the reaction CO( g ) Cl 2( g ) COCl2( g ) In reaction A 2B C 3D ; the rate of reaction of B is found to be 6.2×10-4ms-1, the rate of reaction of A is (a) 6.2×10-4ms-1 (b) 9.2×10-4ms-1 -4 -1 (c) 3.4×10 ms (d) 1.6×10-4ms-1 Which equation below represents the integrated rate law for a first order reaction? (b) A1 A0 kt Mock checks readiness for the real exam. (b) 24.0kJ Determine the enthalpy of formation of C4H4S if ∆Hf CO2, H2O(g) and SO2(g) are -393.5, -285.8 and -296.8kJmol-1 respectively (a) 80.6kJmol-1 (b) 377.1kJmol-1 (c) -377.1kJmol-1 (d) -80.6kJmol-1 At s.t.p., 1.50L of a gas weighed 4.75g. The gas is (H = 1, N = 14, F = 19) (a) HNF3 (b) NF3 (c) N2H (d) NH3 1 1 kt A1 A0 H 33 .2kJ How much heat in kJ is required to raise the temperature of 120g of ethanol from -10.5°C to 44.5°C [S.H.C of ethanol = 2.465g-1°C-1] (a) 1.92kJ (b) 16.2kJ (c) 1.62kJ (d) 1623kJ Calculate the volume of 0.54M NaCl (saline solution) required from the dilution of 100ml of a 6.0M NaCl solution (Na = 23, Cl = 35.5) (a) 1.1L (b) 910mL (c) 1.9L (d) 40mL (a) N 2( g ) 2O2 2 NO2 C4 H 4 S (l ) 6O2 4CO2( g ) 2H 2 O(l ) SO2( g ) KC = 1.2NO2 at 395°C. If a reaction mixture at 395° is found to contain [CO] = 1.5M; [Cl2] = 2.0M and [COCl2] = 1.0M, the reaction is (a) yet to attain equilibrium (b) past equilibrium (c) at equilibrium (d) cannot be evaluated 74. H 9.2kJ 79. Calculate the volume of N2O produces at 2.00mol sample of the reacts at s.t.p. (a) 11.2L (b) 22.4L (c) 33.6L (d) 44.8L 71. N 2( g ) 2O2 N 2 O4 (a) 42.4kJ CaNO3 2 2 NH 4 Cl 2 N 2 O CaCl 2 4 H 2 O 70. (d) A0 A1 kt 76. The heat liberated is (a) Heat of combustion (b) Heat of atomisation (c) Heat of formation (d) Heat of neutralization 67. Saturday 10th March, 2012. 8 Join us for the Revision Classes. Aje Taiwo Tutor FSC 102/DCHM101 (Introductory Chemistry) 85. How many sublevels are in the fifth energy level? (a) 4 (b) 2 (c) 3 (d) 5 86. Which set of quantum numbers does not correctly describe an orbital in an atom (a) n = 2, l = 1, m = - 1 (b) n = 7, l = 3, m = -3 (c) n = -1, l = 1, m = +1 (d) n = 2, l = 0, m = 0 87. Arrange the following orbitals in order of decreasing energy: 3d, 4d, 4s, 5p, 4f (a) 5p > 4f > 4p > 4s > 3d (b) 4f > 4d > 5p > 3d > 4s (c) 4f > 5p > 4d > 3d > 4s (d) 4s > 3d > 4d > 4s > 4f 88. The [OH-} if a solution with pH 11.13 is (a) 1.35×10-3m (b) 7.41×10-3m (c) 2.87m (d) 7.41×102m 89. The derived unit of pressure is SI unit is (a) gcm-1s-1 (b) gm-1s-2 (c) kgcm-1s-2 (d) kgm-1s-2 90. 91. 92. 93. 94. Saturday 10th March, 2012. 98. The following are alkane reactions except (a) substitution with bromine (b) oxidation with oxygen (c) addition with chlorine (d) reaction with radical chlorine 99. Which of the following pairs can undergo polymerisation (a) Alkane and alkene (b) alkane and alkyne (c) Alkane and alkyne (d) alkyne and benzene 100. Which can exhibit two functional groups (a) C3H13OH (b) C2H6O (c) C6H6 101. Dehydration of alcohol with H2SO4 in presence of heat will give? (a) Alkanone (b) Alkene (c) Alkyne (d) Alkyne 102. CH 3 CH 2 CH 2 COOH liAlH 4 ? (a) Butanal Express in scientific notation: -0.00042, 0.1603×1010, 19758 (a) 4.2×10-4, 1.603×10-4, 1.9758×104 (b) -4.2×10-4, 1.603×109, 1.9758×104 (c) -4.2×10-4, 1.603×1010, 1.9758×104 (d) 4.2×10-4, 1.603×109, 1.9758×104 (b) Butenone (c) Butane (d) Butanol 103. The rule in assigning electrons into degenerate orbitals is (a) Anyban rule (b) Hund’s rule of maximum multiplicity (c) Pauli’s exclusive principle (d) All of the above 104. Cyclohexanol Which of the following have the same number of significant figures (1) 3,650,000 (2) 365×103 (c) 3.65×10-3 (a) 1 and 2 (b) 1, 2 and 3 (c) 1 and 3 (d) 2 and 3 Calculate the following and report in scientific notation with the correct number of significant figures 0.0076 ÷ 24.6 (0.000064) (a) 0.009 (b) 9.2 ×10-3 (c) 0.92×10-4 (d) 0.092×10-5 (d) C6H12 105. How many significant figures are in 320.00L (a) 3 (b) 2 (c) 4 (d) 5 When converted to appropriate units, -253°C to K, 235K to °C, -40°C to F, the temperatures are (a) 20K, -38°C, -40°F (b) 28K, -25°C, -17°F (c) 102K, -76°C, -5°F (d) 102K, -76°C, -25°F (a) (b) (c) (d) Which is acidic (a) (b) (c) (d) 106. 95. Which of the following can lower activation energy of a reaction? (a) adding reactants (b) lowering temperature (c) raising temperature (d) adding catalyst 96. All contributed to determining atomic structure except (a) Thompson (b) Dalton (c) Geiger (d) Becquerel 97. Which is not an SI unit (a) meter (b) kilogram (a) 6-bromo, 4-fluoro, 3-methyl hexane (b) 3-bromo, 1-fluoro, 4 methylhexene (c) 4-bromo, 3-fluoro, 5-methyl hexane (d) 4-bromo, 6-fluoro, 3-methyl hexene 107. (c) kilocallorie Mock checks readiness for the real exam. (d) pascal 9 The compound that is aromatic must obey (a) Hund’s rule (b) Huckel’s rule (c) Marckownikoff’s rule (d) Thumb’s rule Join us for the Revision Classes. Aje Taiwo Tutor FSC 102/DCHM101 (Introductory Chemistry) Saturday 10th March, 2012. (d) 6, 7, 8-trimethyl-3-nonene 108. 109. 110. Which reagent used to identify class of an alcohol (a) Lucas reagent (b) Tollen’s reagent (c) Brady’s reagent (d) Master reagent In order to prepare primary alcohol using Grignard reagent, what type of carbonyl compound will you use? (a) substituted alkanone (b) unsubstituted alkanone (c) substituted alkanal (d) unsubstituted alkanal The following are properties of benzene except (a) It undergoes addition (b) It has only one monosubstituted product (c) It undergoes substitution reaction (d) has high stabilization energy 114. B= (a) 1 – methyl-2-ethyl cyclopentane (b) 1-ethyl-2-methyl cyclopentane (c) 1-ethyl-2-methyl-cyclopentane (d) 1-methyl-2-ethylbenzene 115. C= (a) 1-propyl-1-benzyl methanol (b) 1-phenylpropanol (c) 4-phenyl-butan-4-ol (d) 1-phenyl-butanol 116. (a) 5-bromo-2-hexenoic acid (b) 5-bromohexenoic acid (c) 2-bromo-2-hexenoic acid (d) 5-bromo-2-hexanoic acid Consider this for questions 111-112. 111. 112. Indicate the hybridization of the carbon labeled b and c respectively (a) sp3, sp (b) sp2, sp3 (c) sp2, sp2 (d) sp2, sp GIVE IUPAC NAMES FOR A – C Which has highest pKa value (a) HCOOH (b) F – CH2 – CH2COOH (c) CH3CH2COOH (d) NO3 – CH2COOH 118. Alkenes are more reactive than alkanes because i. presence of double bond in the molecule ii. the carbon-carbon double bond is electron rich iii. readily react with electrophiles iv. readily react with nucleophiles (a) i, iv (b) ii, iv (c) i, ii, iii (d) iii, iv 119. The following is true of alkene and alkyne except (a) both undergo addition reaction (b) both can be oxidized by KMnO4 (c) both have acidic hydrogen (d) both give alkane on reduction 120. What is the major product formed when 1-methyl cyclohexane is subjected to hydration under acidic condition? (a) benzene (b) 1-methyl cyclohexanole (c) 2-methyl cyclohexanol (d) 1-methyl benzene B. C. 113. 117. What is bond overlap in i and ii respectively (a) sp2 – sp3 and sp2 – sp2 (b) sp2 – sp3 and sp – sp2 (c) sp3 – sp3 and sp2 – sp2 (d) sp – sp3 and sp2 – sp2 A. A= (a) 1, 2, 3-trimethyl-6-nonane (b) 1, 2, 3-trimethyl, 6-nonene (c) 5, 6, 7-trimethyl-3-octene Mock checks readiness for the real exam. The name of CH 3 CH Br CH 2 CH CHCOOH is 10 Join us for the Revision Classes.