______ is more corrosive than the other dry-chemical extinguishing agents.

______ is more corrosive than the other dry-chemical extinguishing agents.

• A. Potassium bicarbonate
• B. Potassium chloride
• C. Sodium bicarbonate
• D. Calcium carbonate

Answer: (B)

Corrosiveness of dry-chemical extinguishing agents comes from their chemical residues and how those residues interact with metals, especially in the presence of moisture. Potassium chloride contains chloride ions, which readily form corrosive compounds with metals when moisture is present. That chloride action makes it more likely to cause corrosion on metal surfaces and on equipment exposed to the powder after discharge. The other powders listed are bicarbonates or carbonates; their residues are generally less aggressive toward metals and thus less corrosive in typical use scenarios. So, among these options, potassium chloride stands out as the most corrosive due to its chloride content and the corrosion it can promote on metal surfaces.

Corrosiveness of dry-chemical extinguishing agents comes from their chemical residues and how those residues interact with metals, especially in the presence of moisture. Potassium chloride contains chloride ions, which readily form corrosive compounds with metals when moisture is present. That chloride action makes it more likely to cause corrosion on metal surfaces and on equipment exposed to the powder after discharge. The other powders listed are bicarbonates or carbonates; their residues are generally less aggressive toward metals and thus less corrosive in typical use scenarios. So, among these options, potassium chloride stands out as the most corrosive due to its chloride content and the corrosion it can promote on metal surfaces.