| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | chlorine gas | Europe | Associated with use in water treatment and industrial processes | 1 |
| 2 | chloroform | Europe | Chloroform was historically used as an anesthetic in the 19th century. | 1 |
| 3 | chloropicrin | Europe | Chloropicrin is primarily known as a soil fumigant in agriculture, commonly used to control soil-borne pathogens and pests. | 1 |