Which ion is represented by the formula OCN(-)?

The formula OCN⁻ represents the cyanate ion. This ion consists of one oxygen atom, one carbon atom, and one nitrogen atom, with an overall negative charge. The specific arrangement of these atoms results in the cyanate ion having unique chemical properties and reactivities.

Cyanate (OCN⁻) can be understood through its structure where carbon is bonded to nitrogen and oxygen. It is important to note that cyanate is often encountered in various chemical contexts, including biological systems and industrial applications. The other ions listed—nitrate (NO₃⁻), nitrite (NO₂⁻), and thiocyanate (SCN⁻)—have different molecular structures and compositions, which account for their distinct identities and properties.

In summary, the correct identification of OCN⁻ as the cyanate ion is based on its specific atomic composition and structure, setting it apart from other similar ions with different elements and arrangements.