Which ion represents Hypoiodite?

Hypoiodite is the ion that consists of iodine bonded to one oxygen atom, carrying a charge of negative one. This structural representation aligns with the formula IO(-). In this ion, iodine is in a lower oxidation state compared to its higher oxidation states found in other related species.

The other options represent different iodine oxoanions with varying numbers of oxygen atoms and oxidation states of iodine. For instance, IO2(-) corresponds to iodite, which contains two oxygen atoms and has a different oxidation state for iodine. Similarly, IO3(-) is iodate, containing three oxygen atoms, and IO4(-) is periodate with four oxygen atoms. Each of these ions has distinct chemical properties and uses, but they do not represent hypoiodite. Therefore, the correct representation of hypoiodite is indeed IO(-).