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Chlorine is recognized as a toxic industrial chemical due to its potential harmful effects on human health and the environment when it is released into the air or water. It is widely used in various industrial processes, especially in the production of disinfectants, bleaches, and other chemicals. Exposure to chlorine gas can lead to respiratory issues, skin irritation, and other serious health problems.

In contrast, substances like salt and water are generally safe in typical exposure situations and do not pose the same level of toxicity or hazards as chlorine. Fertilizers, while potentially harmful in certain contexts, are not categorized as toxic industrial chemicals in the same manner as chlorine. Thus, chlorine stands out as the compound that aligns with the definition of a toxic industrial chemical due to its inherent dangers and industrial applications.