Which pictogram indicates that a chemical is deadly or highly toxic?

• A. Skull and crossbones
• B. Exclamation mark
• C. Environmental
• D. Health hazard

Answer: (A)

Pictograms convey hazard type and severity with specific symbols. The skull and crossbones marks acute toxicity, signaling that the substance is deadly or highly toxic and can cause death from a single exposure in small amounts. This is distinct from other symbols: the exclamation mark flags less severe hazards like irritants or harmful effects; the environmental pictogram warns about harm to the environment; the health hazard pictogram points to long‑term risks such as carcinogenicity or respiratory damage. So the skull and crossbones is the indicator for a chemical that is deadly or highly toxic.