Which of the following are examples of incompatible hazmat that must be segregated?

• A. Water and air.
• B. Acids and bases.
• C. Salt and sugar.
• D. Wood and plastic.

Answer: (B)

In hazmat transport, you must segregate materials that could react if they touch each other. Acids and bases are a classic incompatible pair because, when combined, they react violently—neutralizing each other and often releasing heat, fumes, or gases that can damage packaging or create a dangerous environment. Keeping them apart prevents these dangerous interactions during loading, transport, and unloading.

Water and air aren’t hazmat materials and don’t pose a segregation issue. Salt and sugar are benign solids with no hazardous reaction when stored together. Wood and plastic are inert materials and also don’t require segregation related to hazmat compatibility.