Which of the following processes is commonly used to produce carbon monoxide (CO)?

Explanation

Carbon monoxide forms when carbon-containing materials burn without enough oxygen present. Incomplete combustion creates CO instead of carbon dioxide because insufficient oxygen is available.

Car engines, gas stoves, and furnaces produce carbon monoxide when they do not get enough air. Complete combustion with plenty of oxygen would produce carbon dioxide instead.

This is why carbon monoxide is dangerous in enclosed spaces. Poor ventilation leads to incomplete combustion, releasing toxic CO gas that can cause poisoning.