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1 Name:. Correct Questions = Wrong Questions =.. Unattempt Questions = Marks =

2 1. Which anion forms the smallest number of insoluble salts? (A) Cl - (B) NO 3 - (C) CO 3 2- (D) SO Which piece of apparatus can measure a volume of 25.0 ml most precisely? (A) 25 ml beaker (B) 25 ml conical flask (C) 25 ml graduated (D) 25 ml pipet cylinder 3. How many significant figures should be reported in the answer to the calculation (Assume all numbers are experimentally determined.) (A) 2 (B) 3 (C) 4 (D) 5 4. Five pellets of a metal have a total mass of 1.25 g and a total volume of ml. What is the density of the metal in g ml -1? (A) (B) (C) 4.50 (D) What is the color of the flame test for sodium? (A) green (B) red (C) violet (D) yellow 6. When is it acceptable to eat in a chemistry laboratory? (A) Anytime when a person is not doing an experiment. (B) Whenever there are no hazardous chemicals out. (C) If it is necessary to do so in order to keep another appointment. (D) Never. 7. Selenium (Se) is similar to sulfur in its properties and francium (Fr) is an alkali metal. What is the formula for francium selenite? (A) FrSeO 2 (B) Fr 2 SeO 4 (C) Fr 2 SeO 3 (D) Fr 2 Se 2 O 3 8. Calculate the mass percentage of Molar mass, g mol -1 nitrogen in hydrazinium sulfate (N 2 H 5 ) 2 SO 4. (N 2 H 5 ) 2 SO (A) 10.8 (B) 17.3 (C) 34.5 (D) How many ozone molecules are in 3.20 g of O 3? (A) (B) (C) (D) Acetylene, C 2 H 2, reacts with oxygen according to the unbalanced equation: C 2 H 2 (g) + O 2 (g) r CO 2 (g) + H 2 O(g) What is the O 2 /C 2 H 2 ratio when this equation is correctly balanced? (A) 2/1 (B) 3/1 (C) 4/1 (D) 5/2 11. Silicon carbide, SiC, is produced by heating SiO 2 and C to high temperatures according to the equation: SiO 2 (s) + 3C(s) r SiC(s) + 2CO(g) How many grams of SiC could be formed by reacting 2.00 g of SiO 2 and 2.00 g of C? (A) 1.33 (B) 2.26 (C) 3.59 (D) A 7.66 g sample of hydrated sodium sulfate, Na 2 SO 4. xh2 O, forms 4.06 g of anhydrous Na 2 SO 4. What is the value of x? Molar mass, g mol -1 Na 2 SO (A) 0.2 (B) 3.6 (C) 5 (D) Silver metal reacts with nitric acid according to the equation: 3Ag(s) + 4HNO 3 (aq) r 3AgNO 3 (aq) + NO(g) + 2H 2 O(l) What volume of 1.15 M HNO 3 (aq) is required to react with g of silver? (A) 4.74 ml (B) 6.32 ml (C) 8.43 ml (D) 25.3 ml 14. Which solute produces the highest boiling point in a 0.15 m aqueous solution? (A) CaCl 2 (B) NaBr (C) CuSO 4 (D) CH 3 OH Page 1

3 15. A gas has a volume of 6.0 L at a pressure of 0.80 atm. What is the volume if the pressure is changed to 0.20 atm at constant temperature? (A) 1.5 L (B) 3.0 L (C) 12 L (D) 24 L 16. Which will increase the vapor pressure of a liquid? 1 increase in temperature 2 increase in surface area (B) 2 only (C) Both 1 and 2 (D) Neither 1 nor What pressure (in atm) will be exerted by a 1.00 g sample of methane, CH 4, in a 4.25 L flask at 115 C? (A) (B) (C) (D) The lowest melting points overall occur for members of which class of solids? (A) ionic (B) metallic (C) molecular (D) network covalent 19. What are the strongest intermolecular force between neighboring carbon tetrachloride, CCl 4, molecules? (A) dipole-dipole forces (C) hydrogen bonds 20. According to the phase diagram shown, where does a mixture of solid and liquid exist at equilibrium? (A) along line MN (C) along line LN 21. Calculate the amount of energy released when mol of diborane, B 2 H 6, reacts with oxygen to produce solid B 2 O 3 and steam. (B) dispersion forces (D) covalent bonds Pressure M N K Temperature (B) along line KN (D) in the region KNL Hf, (kj.mol -1 ) B 2 H 6 (g) 35 B 2 O 3 (s) H 2 O(l) -285 H 2 O(g) -241 (A) 203 kj (B) 216 kj (C) 330 kj (D) 343 kj 22 How much heat is required to raise the temperature of 100. g of Fe 2 O 3 from 5.0 C to 25.0 C? (A) 1.58 kj (C) kj -1 Specific heat, J g-1 C Fe 2 O (B) 1.27 kj (D) kj L 23. Given the thermochemical equations: Br 2 (l) + F 2 (g) r 2BrF(g) Br 2 (l) + 3F 2 (g) r 2BrF 3 (g) determine H for the reaction BrF(g) + F 2 (g) r BrF 3 (g) (A) -956 kj (C) -478 kj 24. Use bond energies to calculate H for the reaction: H 2 (g) + O 2 (g) r H 2 O 2 (g) (A) -521 kj (C) -199 kj H = -188 kj H = -768 kj H =? (B) -580 kj (D) -290 kj Bond Energy, kj. mol -1 H-H 432 H-O 459 O-O 207 O=O 494 (B) -486 kj (D) 199 kj 25. Which reaction occurs with a decrease in entropy? (A) N 2 (g) + O 2 (g) r 2NO(g) (B) N 2 O 4 (g) r 2NO 2 (g) (C) 2CO(g) r C(s) + CO 2 (g) (D) 2HCl(aq) + Ag 2 CO 3 (s) r 2AgCl(s) + CO 2 (g) + H 2 O(l) 26. A homogeneous liquid reaction mixture is often heated to increase the rate of reaction. This is best explained by the fact that raising the temperature (A) increases the heat of reaction. (B) decreases the energy of activation. (C) increases the vapor pressure of the liquid (D) increases the average kinetic energy of the reactants. 27. For the reaction, 2A + B r C which relationship is correct? (A) [A] = [C] (B) - [A] = [C] (C) -2 [A] = [C] (D) - [A] = 2 [C] 28. This exothermic reaction is catalyzed by MnO 2 (s). 2H 2 O 2 (aq) r 2H 2 O(l) + O 2 (g) Which of the following will increase the rate of this reaction? 1. Raising the temperature 2. Increasing the surface area of MnO 2 (s) (B) 2 only (C) Both 1 and 2 (D) Neither 1 and 2 Page 2

4 29. Which is constant for different reactant concentrations in a first-order reaction? 30. (A) The time required for the concentration of reactants to drop below M. (B) The time required for one-half of reactants to disappear. (C) The rate of disappearance of reactants in mol. L -1. time -1. (D) The rate of formation of products in mol. L -1. time -1. The reaction, 3I - (aq) + S 2 O 2-8 (aq) r I 3 - (aq) + 2 2SO4 (aq) yields the kinetic data in the table. [I - ] o (mol.l -1 ) [S 2 O 2-8 ] o (mol.l -1 ) Relative Rate What is the rate equation? (A) Rate = k[i - ][ S 2 O 2-8 ] (B) Rate = k[i - ] 2 [S 2 O 2-8 ] (C) Rate = k[i - ] 3 [S 2 O 8 2- ] (D) Rate = k[i - ] 2 [S 2 O 8 2- ] For the reaction, 2CCl 4 (g) + O 2 (g) s 2COCl 2 (g) + 2Cl 2 (g) what is the equilibrium expression, Kc? (A) = [ COCl ][ Cl ] (B) 2 COCl Cl 2 2 [CCl ][O ] [CCl ][O ] 32. (C) 4 2 = [ COCl ][ Cl ] 2 2 [CCl ][O ] (D) = [ ][ ] = [ COCl ] [ Cl ] [CCl ] [O ] For the reaction, 2SO 2 (g) + O 2 (g) s 2SO 3 (g) H < 0 Which change(s) will increase the fraction of SO 3 (g) in the equilibrium mixture? 1. Increasing the pressure 2. Increasing the temperature 3. Adding a catalyst (B) 3 only (C) 1 and 3 only (D) 1, 2 and What is the [H + ] in a 0.10 M Ka solution of ascorbic acid, C 6 H 8 O 6? C 6 H 8 O (A) M (C) M (B) M (D) M A 0.10 M solution of which salt is the most acidic? (A) NH 4 C 2 H 3 O 2 (B) NaCN (C) KNO 3 (D) AlCl A student is asked to prepare a buffer solution with a ph of This can be accomplished by using a solution containing which of the following? (A) HNO 2 only (C) HNO 2 and NaNO 2 Ka HNO HCN (B) HCN only (D) HCN and NaCN 36. A saturated solution of Ksp which compound has the lowest [Ca 2+ ]? CaF CaCO Ca(OH) CaSO (A) CaF 2 (B) CaCO 3 (C) Ca(OH) 2 (D) CaSO Which reaction occurs at the cathode during the electrolysis of an aqueous solution of KCl? (A) K + (aq) + e - r K(s) (B) 2 H 2 O(l) + 2e - r H 2 (g) + 2OH - (aq) (C) 2Cl - (aq) r Cl 2 (g) + 2e - (D) 2H 2 O(l) r O 2 (g) + 4H + (aq) + 4e Correct statements about a voltaic (galvanic) cell include which of the following? 1. Oxidation occurs at the anode. 2. Electrons flow from the cathode to the anode. (B) 2 only (C) Both 1 and 2 (D) Neither 1 nor MnO NO H + r Mn 2+ + NO H 2 O When this equation is balanced correctly with the smallest integer coefficients, what is the coefficient for H +? (A) 1 (B) 6 (C) 8 (D) An electrochemical cell constructed for the reaction: Cu 2+ (aq) + M(s) r Cu(s) + M 2+ (aq) has an E = 0.75 V. The standard reduction potential for Cu 2+ (aq) is 0.34 V. What is the standard reduction potential for M 2+ (aq)? (A) 1.09 V (C) V (B) V (D) V Page 3

5 41. In which case does chromium undergo reduction? (A) CrO 3 r CrOF 3 (B) Cr 3+ r Cr(OH) (C) 2CrO 4 r Cr 2 O 7 (D) Cr r CrO M aqueous solutions of AgNO 3, Cu(NO 3 ) 2 and Au(NO 3 ) 3 are electrolyzed in the apparatus shown, so the same amount of electricity passes through each solution. If 0.10 moles of solid Cu are formed how many moles of Ag and Au are formed? (A) 0.10 moles Ag, 0.10 moles Au (B) 0.05 moles Ag, moles Au (C) 0.05 moles Ag, 0.15 moles Au (D) 0.20 moles Ag, moles Au Ag Cu Au 43. In a hydrogen atom, which transition produces a photon with the highest energy? (A) n = 3 r n = 1 (B) n = 5 r n = 3 (C) n = 12 r n = 10 (D) n = 22 r n = How many orbitals in a ground state oxygen atom are completely filled? (A) 1 (B) 2 (C) 3 (D) Which atom has the smallest first ionization energy? (A) Na (B) K (C) Mg (D) Ca 46. The electron configuration of a cobalt atom is 1s 2 2s 2 2p 6 3s 2 3p 6 3d 7 4s 2. How many unpaired electrons are present in a gaseous Co 3+ ion in its ground state? (A) 6 (B) 4 (C) 2 (D) When the atoms; P (Z = 15), S (Z = 16) and As (Z = 33), are arranged in order of increasing radius, what is the correct order? (A) P, S, As (B) As, S, P (C) S, P, As (D) P, As, S 48. The oxide of which element is the most ionic? (A) Al (B) B (C) C (D) Si 49. All of the following lists include at least one ionic compound EXCEPT (A) NO 2, NaNO 2, KNO 3 (B) CF 4, CaF 2, HF 50. Which species below has the same general shape as NH 3? 2-2- (A) SO 3 (B) CO 3 (C) NO 3 - (D) SO When forming covalent bonds, which atom can have more than eight valence electrons? (A) H (B) N (C) F (D) Cl 52. Which diatomic molecule has the shortest bond length? (A) N 2 (B) O 2 (C) F 2 (D) S Which species is nonpolar? (A) HCl (B) OCl 2 (C) NCl 3 (D) CCl In which species are all the carbon atoms considered to be sp 2 hybridized? (A) C 2 H 2 (B) C 2 H 4 (C) C 3 H 8 (D) C 4 H Which formula can be used to represent an alkynes? (A) C n H 2n-2 (B) C n H 2n (C) C n H 2n+2 (D) C n H 2n How many different structural isomers exist for dichloropropane, C 3 H 6 Cl 2? (A) 4 (B) 5 (C) 6 (D) some other number 57. All of the formulas below correspond to stable compounds EXCEPT (A) CH 2 O (B) CH 2 O 2 (C) CH 3 O (D) CH 4 O 58. Which of the compounds shown are isomers? 1 CH 3 CH 2 OCH 3 2 CH 3 CH 2 OCH 2 CH 3 3 CH 3 CH 2 CH 2 OH 4 CH 2 =CHOCH 3 (A) 1 and 3 (B) 1 and 2 (C) 2 and 3 (D) 1 and Which functional group is present in CH 3 COOH? (A) aldehyde (C) alcohol (B) carboxylic acid (D) hydroperoxide 60. How many sigma bonds does a molecule of ethene have? (A) 1 (B) 4 (C) 5 (D) 7 (C) NaCl, MgCl 2, SCl 2 (D) H 2 S, SO 2, SF 6 Page 4

6 ANSWER KEY Number Answer 1. B 2. D 3. A 4. C 5. D 6. D 7. C 8. C 9. A 10. D 11. A 12. D 13. C 14. A 15. D 16. A 17. C 18. C 19. B 20. B 21. A 22. B 23. D 24. C 25. C 26. D 27. D 28. C 29. B 30. A Number Answer 31. D 32. A 33. B 34. D 35. C 36. B 37. B 38. A 39. B 40. C 41. A 42. D 43. A 44. C 45. B 46. B 47. C 48. A 49. D 50. A 51. D 52. A 53. D 54. B 55. A 56. A 57. C 58. A 59. B 60. C