Not a form of chemical agent?

• A. Vapors
• B. Dust
• C. Solids
• D. Gases

Answer: (B)

Chemical agents are described by the way they are dispersed in the air, which typically falls into gases, vapors, liquids (that can produce vapors), or aerosols (tiny droplets or particles suspended in air). Dust is a specific solid particulate form, not a standard way used to classify how a chemical agent is presented or disseminated in training and doctrine. Because of that, dust doesn’t fit the usual categories used to describe chemical agents, making it the best pick for “not a form of chemical agent.”