Which gas is listed as a toxic gas?

Which gas is listed as a toxic gas?

• A. Oxygen
• B. Nitrogen
• C. Chlorine
• D. Argon

Answer: (C)

Gas safety uses the term toxic gas for substances that can injure health when inhaled at certain concentrations. Chlorine fits this category because inhaling it irritates and damages the respiratory tract: it reacts with water in the lungs to form acids that attack airway tissues, causing coughing, chest tightness, and shortness of breath, and can lead to more severe lung injury with higher exposures. Oxygen, while essential for life, is not a toxic gas under normal conditions. Nitrogen and argon are inert gases and not toxic themselves, though they can pose asphyxiation risks if they displace oxygen in an enclosed space. That combination of acute respiratory irritation and potential harm makes chlorine the toxic gas in this list.

Gas safety uses the term toxic gas for substances that can injure health when inhaled at certain concentrations. Chlorine fits this category because inhaling it irritates and damages the respiratory tract: it reacts with water in the lungs to form acids that attack airway tissues, causing coughing, chest tightness, and shortness of breath, and can lead to more severe lung injury with higher exposures. Oxygen, while essential for life, is not a toxic gas under normal conditions. Nitrogen and argon are inert gases and not toxic themselves, though they can pose asphyxiation risks if they displace oxygen in an enclosed space. That combination of acute respiratory irritation and potential harm makes chlorine the toxic gas in this list.