Which of the following is an example of a hazardous chemical reagent?

Hazardous chemical reagents are substances that can pose a risk to health or the environment due to their chemical properties. Acids fall into this category because they can cause harm through corrosion, burns, or toxic reactions when they come in contact with skin or are inhaled. They often require specific safety measures during handling, including personal protective equipment, proper storage, and disposal protocols to prevent accidents and exposure.

In contrast, water and salt are generally considered safe and non-hazardous under normal handling and usage conditions. Glucometer strips, while potentially containing small amounts of chemicals, are typically used in a controlled environment with minimal risk when handled properly. Thus, the classification of acids as hazardous chemical reagents is valid due to their potential for harm in various contexts.