Final answer:
NH₂-NO₃ is a nitrate ion.
Step-by-step explanation:
The nitrate ion is represented by the formula NO₃-. Among the options given, the correct choice for a nitrate is NH₂-NO₃. This ion consists of a central nitrogen atom bonded to two hydrogen atoms and three oxygen atoms. It is commonly found in compounds like ammonium nitrate (NH₄NO₃).