Identify one class of dry chemicals approved for use as extinguishing agents.

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Multiple Choice

Identify one class of dry chemicals approved for use as extinguishing agents.

Dry chemical extinguishing agents are powders designed to interrupt the flame’s chemical reactions and smother the fire by coating the fuel. A common and widely approved class of these powders is salts of potassium, such as potassium bicarbonate (often sold as Purple K). These potassium salts are effective on A, B, and C fires and are specifically used in dry chemical extinguishers. The other options describe different types of extinguishing agents: CO2 is a gas that displaces oxygen, foam is a liquid film for liquid fuels, and Halon 1311 is a clean agent that acts differently from a dry powder. Therefore, salts of potassium represent the class of dry chemical extinguishing agents.

Dry chemical extinguishing agents are powders designed to interrupt the flame’s chemical reactions and smother the fire by coating the fuel. A common and widely approved class of these powders is salts of potassium, such as potassium bicarbonate (often sold as Purple K). These potassium salts are effective on A, B, and C fires and are specifically used in dry chemical extinguishers. The other options describe different types of extinguishing agents: CO2 is a gas that displaces oxygen, foam is a liquid film for liquid fuels, and Halon 1311 is a clean agent that acts differently from a dry powder. Therefore, salts of potassium represent the class of dry chemical extinguishing agents.

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