Final answer:
There is no single extinguishing agent that can extinguish any combustible metal. Different combustible metals require specific extinguishing agents due to their unique properties and reactions.
Step-by-step explanation:
There is no single extinguishing agent that can extinguish any combustible metal. Different combustible metals require specific extinguishing agents due to their unique properties and reactions. For example, carbon dioxide (CO₂) fire extinguishers are not effective for extinguishing magnesium fires, as the reaction between magnesium and CO₂ actually produces more heat. Instead, specialized extinguishing agents like dry chemical or sand are used for magnesium fires.