What is the major safety concern with magnesium?

• A. It is highly magnetic
• B. Danger of fire (explosive reaction with water)
• C. It has a low melting point
• D. It is corrosion resistant

Answer: (B)

Magnesium poses a major safety risk because it reacts with water to produce heat and hydrogen gas, and that hydrogen can ignite, causing a powerful, hard-to-control fire. In rescue scenarios, this means water is dangerous to use on a magnesium fire and you need specialized extinguishing methods or smothering with an inert material like dry powder or sand. Magnesium burns at a very high temperature and can continue to reflash, so the fire hazard is ongoing even after it seems extinguished. The other statements aren’t the main safety issue: magnesium isn’t magnetic, its melting point isn’t unusually low for a metal, and corrosion resistance isn’t the primary concern in the context of a fire risk.