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Nickel carbonyl is the organonickel compound with the formula Ni(CO)4.  It is a volatile, yellow liquid with a musty odour. Nickel carbonyl is flammable and explosive. It is slightly soluble in water, but soluble in other organic solvents.  Nickel carbonyl is formed when metallic nickel combines with carbon monoxide. It is considered to be one of the most toxic chemicals used industrially and the magnitude of its morbidity and mortality has been compared to that of hydrogen cyanide.