SDSU Chemistry Placement Practice Test

The correct answer is BrO3-, which represents the bromate ion. In this ion, bromine (Br) is in the +5 oxidation state and is bonded to three oxygen (O) atoms. The negative charge indicates that it is an anion.

Bromate is part of a family of oxyanions derived from bromine, where the number of oxygen atoms varies. In this case, having three oxygen atoms is characteristic of the bromate ion, and it is commonly found in various chemical contexts, including in organic and inorganic synthesis.

The other choices do not accurately represent the bromate ion. For example, BrO2 represents bromite, which has two oxygen atoms and a different oxidation state for bromine. BrO4 does not correspond to any common species involving bromine, as bromine typically does not form a stable tetraoxygen compound in this context. Lastly, Br3O misrepresents the molecular structure and does not conform to the typical nomenclature for bromine-oxygen species. Thus, BrO3- is the accurate formula for bromate.