26. Chemists commonly use a rule of thumb that an increase of 10 K in temperature doubles the rate of a reaction. What must the activation energy be for this statement to be true for a temperature increase from 20°C to 30°C?
(A) 51.2
(B) 49.5
(C) 46.1
(D) 56.7 kJ/mol

27. The value of the equilibrium constant, K, is dependent on: I. the nature of the reactants and products II., the concentration of the reactants and products, III. the temperature of the system, IV. the pressure of the system. (A) I, II (B) I, III (C) I, II, III (D) I, II, IV

28. The autoionization of water, \( \text{H}_2\text{O}(l) + \text{H}_2\text{O}(l) \rightleftharpoons \text{H}_3\text{O}^+(aq) + \text{OH}^-(aq) \), is known to be endothermic. Which of the following correctly states what occurs as the temperature of water is raised? (A) The pH of the water does not change, and the water remains neutral. (B) The pH of the water decreases, and the water becomes more acidic. (C) The pH of the water increases, and the water remains neutral. (D) The pH of the water decreases, and the water remains neutral.

29. Which of the following is the strongest reducing agent? \( \text{Zn}^{2+} + 2\text{e}^- \rightleftharpoons \text{Zn} \quad E^\circ = -0.76 \text{ V}; \text{MnO}_4^- + 4\text{H}^+ + 3\text{e}^- \rightleftharpoons \text{MnO}_2 + 2\text{H}_2\text{O} \quad E^\circ = 1.68 \text{ V}; 2\text{H}^+ + 2\text{e}^- \rightleftharpoons \text{H}_2 \quad E^\circ = \) 0.00 V; \( \text{Cl}_2 + 2\text{e}^- \rightleftharpoons 2\text{Cl}^- \quad E^\circ = 1.36 \text{ V}. \) (A) Zn (B) MnO2 (C) H2 (D) Cl2

30. What is the potential at 25°C for the cell: Cr|Cr3+(0.030 M)||Ag+(0.00030 M)|Ag? Cr3+ + 3e- <=> Cr Eo = -0.73 V; Ag+ + e- <=> Ag Eo = 0.80 V (A) 0.95 V (B) 1.35 V (C) 1.49 V (D) 1.71 V

31. Which of the following solutions will be the best buffer at a pH of 4.74? (Ka for acetic acid, HC2H3O2, is 1.8 × 10-5, Ka for benzoic acid, HC7H5O2, is 6.4×10-5) (A) 0.10 M HC2H3O2 + 0.10 M NaC2H3O2 (B) 5.0 M HC2H3O2 + 5.0 M Na C2H3O2 (C) 0.50 M HC7H5O2 + 0.14 M KC7H5O2 (D) 5.0 M HC7H5O2 + 1.4 M KC7H5O2

32. The pH of a 0.100 M benzoic acid (6.4×10-5) aqueous solution is (A) 2.60 (B) 4.19 (C) 3.26 (D) 2.53

33. The solubility of solid silver chromate, Ag2CrO4 (Ksp =9.0 × 10-12) in 0.500 M solution of K2CrO4 at 25oC is (A) 1.8×10-11 (B) 4.2×10-6 (C) 2.1×10-6 (D) 1.3×10-4

34. The solubility of which of the following compounds in water can not be increased by adding HNO3? (A) Fe(OH)3 (B) CuS (C) AlPO4 (D) HgCl2

35. Which of the following result(s) in an increase in the entropy of the system? I. Br2(g) → Br2(l), II. NaBr(s) → Na+(aq) + Br-(aq), III. O2(298 K) → O2(373 K), IV. NH3(1 atm, 298 K) → NH3(3 atm, 298 K) (A) I, III (B) II, III (C) I, II, III (D) II, III, IV

36. For the reaction A + B $\rightleftharpoons$ C + D, $\Delta H^\circ = +40$ kJ and $\Delta S^\circ = +50$ J/K. Therefore, the reaction under standard conditions is (A) spontaneous at temperatures less than 10 K (B) spontaneous at temperatures greater than 800 K (C) spontaneous only at temperatures between 10 K and 800 K (D) spontaneous at all temperatures

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