Which substance is listed as a toxic solid?

Which substance is listed as a toxic solid?

• A. Cadmium
• B. Chloroform
• C. Ammonia
• D. Chlorine

Answer: (A)

Understanding toxic solids means identifying a substance that is both hazardous and in a solid form at room temperature. Cadmium fits this category because it is a toxic heavy metal that exists as a solid under ordinary conditions, and exposure to cadmium can cause serious health effects, especially kidney and lung damage with prolonged or high-dose exposure. The other items are not solids at room temperature: chloroform is a liquid, while ammonia and chlorine are gases, so they are classified by different hazard categories rather than as toxic solids. That's why cadmium is the correct choice.

Understanding toxic solids means identifying a substance that is both hazardous and in a solid form at room temperature. Cadmium fits this category because it is a toxic heavy metal that exists as a solid under ordinary conditions, and exposure to cadmium can cause serious health effects, especially kidney and lung damage with prolonged or high-dose exposure. The other items are not solids at room temperature: chloroform is a liquid, while ammonia and chlorine are gases, so they are classified by different hazard categories rather than as toxic solids. That's why cadmium is the correct choice.