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39. Consider this spontaneous reaction at standard conditions If the pH is lowered (A) E decreases. (C) E decreases (B) E increases. (D) E increases. 40. Which process is an oxidation? (B) CIO,-CIO 41. If 1.00 A of current is used to electroplate a metal for a od of 25 seconds, which solution will produce the rgest mass of electroplated metal? (A) 0.050 MAg (C) 0.100 M Cu (B) 0.100 MC (D) 0.100 M Fe 42. Which type of battery docs not have both an anode and a cathode? (A) All have an anode and cathode. (B) nickel-cadmium (C) lithium ion (D) lead-acid 43. How many scconds are required to deposit 1.32 g of copper from a CuSO, solution using a current of 0.938 amperes? (A) 4.27 x 10 (C) 2.14 x 10 (B) 3.76 x 10 (D) 4.22 x 10 44. This reaction takes place in an aqueous acidic solution When balanced, the smallest whole-number coefficient for Cr,0,2 is (A) 1 (B) 2 (C) 3 (D) 4

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