Which gas is a type of blood agent that smells like almonds and is colorless?

Which gas is a type of blood agent that smells like almonds and is colorless?

• A. Blood agents
• B. Nerve agents
• C. Cyanide gas
• D. Dushaqiang (TETS)

Answer: (C)

Blood agents disrupt the body's ability to use oxygen at the cellular level. Cyanide gas, specifically hydrogen cyanide, is a classic blood agent that fits this description: it is a colorless gas and is often described as having an almond-like odor at low concentrations. The almond smell is not guaranteed—many people cannot detect it, and at toxic levels the odor can disappear—so the key point is its mode of action and typical physical form. Cyanide blocks cytochrome oxidase in mitochondria, stopping cellular respiration and causing rapid hypoxia and death. This distinguishes it from nerve agents, which mainly affect the nervous system rather than cellular respiration, and from other compounds not classified as blood agents.

Blood agents disrupt the body's ability to use oxygen at the cellular level. Cyanide gas, specifically hydrogen cyanide, is a classic blood agent that fits this description: it is a colorless gas and is often described as having an almond-like odor at low concentrations. The almond smell is not guaranteed—many people cannot detect it, and at toxic levels the odor can disappear—so the key point is its mode of action and typical physical form. Cyanide blocks cytochrome oxidase in mitochondria, stopping cellular respiration and causing rapid hypoxia and death. This distinguishes it from nerve agents, which mainly affect the nervous system rather than cellular respiration, and from other compounds not classified as blood agents.