12. An aqueous solution of an unknown ruthenium salt is electrolyzed by a current of 2.50 A for 50.0 min. If 2.618 g Ru is produced at the cathode, what is the charge on the ruthenium ion in solution? (A) 1+ (B) 2+ (C) 3+ (D) 4+ (E) 6+

18. Most valence electron transitions occur in the _ region of the electromagnetic spectrum. Rotational transitions are typically induced by radiation in the region, and vibrational transitions are typically induced by radiation in the _ region. (A) X-ray, UV-vis, IR (B) UV-vis, IR, microwave (C) IR, microwave, UV-vis (D) Microwave, X-ray, UV-vis (E) UV-vis, microwave, IR

12. An aqueous solution of an unknown ruthenium salt is electrolyzed by a current of 2.50 A for 50.0 min. If 2.618 g Ru is produced at the cathode, what is the charge on the ruthenium ion in solution?
(A) 1+
(B) 2+
(C) 3+
(D) 4+
(E) 6+

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