Cyanide ion | CN(−) PubChem
Excerpt from ERG Guide 157 [Substances Toxic and/or Corrosive (NonCombustible / WaterSensitive)]: TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or with water or moist air may release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of ...