A sanitizer accidently sprayed on food would be an example of what kind of contamination

Chemical contamination

Explanation:

Sanitizers are chemicals sprayed on surfaces or substances to reduce the build-up of microorganisms such as bacterial to a safe level. When these substances are sprayed on food by accident, it is categorized as chemical contamination. Sanitizers are not meant to be put on edible products.

Foods that are contaminated by these chemicals are said to be unsafe for human consumption.