Which of the following is NOT a category of hazardous liquids?

The correct choice is inert substances, as they do not fall into the category of hazardous liquids. In hazardous materials classifications, corrosives, flammable liquids, and reactives are all considered hazardous due to their potential to cause harm or adverse reactions when they come into contact with other substances.

Corrosives can damage living tissue and materials, making them dangerous to handle. Flammable liquids pose a fire risk due to their ability to ignite easily, while reactives can undergo violent reactions when mixed with other chemicals, leading to explosions or release of toxic gases. In contrast, inert substances are typically stable and do not chemically react under normal conditions, which is why they are not classified as hazardous liquids.