53. Which of the following compound is the most ionic?
(A) Al₂O₃
(B) MgCl₂
(C) HCl
(D) KF

55. Which methods will help us to distinguish between equimolar solutions of a strong base and a strong acid? I. Add magnesium to each solution and look for the formation of gas bubbles . II. Add aqueous sodium hydroxide to each solution and measure the temperature change. III. Measure the electrical conductivity of each solutions. (A) I and II only (B) I and III only (C) II and III only (D) I, II, and III

56. The data in the table below were obtained for the reaction A + B → C. Which of the following is the rate law for the reaction? (A) Rate = k[A] (B) Rate = k[A][B] (C) Rate = k [A][B]2 (D) Rate = k[B] 7

57. During the electrolysis of a molten salt, which statement is not correct? (A) The ions only move when a current flows. (B) Positive ions are attracted to the negative electrode. (C) Positive ions gain electrons at the negative electrode. (D) Negative ions lose electrons at the positive electrode.

58. Sn(s) + 2Fe3+(aq) → Sn2+(aq) + 2Fe2+(aq) Tin metal reacts with aqueous Fe3+ ions according to the equation above. Which of the following factors will increase the rate of this reaction? I. Increasing the ion concentration Fe3+ II. Decreasing the size of the tin pieces (A) I only (B) II only (C) Both I and II (D) Neither I nor II

59. The curve above is obtained for the reaction of an excess of CaCO3 with hydrochloric acid. How and why does the rate of reaction change with time?(A)(B)(C)(D)

60. Which energy value(s) will change when a catalyst is added? (A) I only (B) II only (C) II and III only (D) I, II and III

61. Which set of coefficients properly balances the equation for the combustion of ethane? __ethane(g) + __oxygen(g) → __carbon dioxide(g) + __water(g) (A) 1, 7, 2, 3 (B) 1, 2, 1, 2 (C) 2, 7, 4, 6 (D) 1, 4, 1, 2

62. Which of the following are state functions? (A) Work, enthalpy (B) Heat, enthalpy (C) Enthalpy, internal energy (D) Work, heat

63. What is the valence electron configuration of S? (A) 1s2 2s2 2p6 (B) 1s2 2s2 2p6 3s1 3p5 (C) 4s2 4p4 (D) 3s2 3p4

64. Which of the following statements is true for a monatomic ideal gas? (A) Cv < Cp (B) Cv > Cp (C) Cv = Cp (D) More information is needed

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