Final answer:
The nitrite ion, NO2-, is the correct answer. Nitrites are a class of chemical compounds that contain the nitrite ion. They are commonly used as preservatives in processed meats and can be converted to nitrates in the body.
Step-by-step explanation:
The nitrite ion, NO2-, is the correct answer. Nitrites are a class of chemical compounds that contain the nitrite ion. They are formed when nitric oxide (NO) reacts with oxygen or when nitrous acid (HNO2) is produced. Nitrites are commonly used as preservatives in processed meats and can be converted to nitrates in the body.