“The mixture of hydrogen methane and carbon monoxide is known as:”

"Coal gas a mixture of hydrogen methane and carbon monoxide was historically used for lighting and heating before natural gas became prevalent. Produced through coal gasification it played a significant role during the Industrial Revolution powering urban infrastructure. Though largely replaced its study remains relevant in understanding energy transitions and chemical engineering. Coal gas’s composition highlights the complexity of industrial chemistry contributing to advancements in energy production and environmental management particularly in the context of sustainable fuel alternatives."