University Of Central Florida (UCF) CHM2045C Chemistry Fundamentals I Practice Exam 1

The correct choice is HSO4→, which stands for the hydrogen sulfate ion. This ion contains a sulfur atom, as it is derived from sulfuric acid (H→SO→) but has lost one hydrogen ion, resulting in a charge of -1. The structure of HSO4→ includes one sulfur atom bonded to four oxygen atoms, with one of those oxygens also bonded to a hydrogen atom. The other options do not meet the criteria of containing both a sulfur atom and a charge of -1. The cyanide ion (CN→) does not contain sulfur at all; it is composed of carbon and nitrogen. The bisulfite ion (HSO3→) does include sulfur, but its charge is -1, and the sulfate ion also represents sulfur but with a different structure and higher oxidation state compared to the bisulfite ion. The peroxide ion (O2²→), on the other hand, consists solely of oxygen atoms and thus does not include sulfur. Thus, HSO4→ is the only ion that satisfies the conditions presented in the question.