Question

how is coal gas obtained ? give one traditional use of coal gas

Answer 1

Coal gas is a mixture of gases i.e. hydrogen, methane, carbon monoxide and volatile hydrocarbons procured by the destructive distillation of coal. It is a flammable gas and is made fromcoal which supplied via a piped system and is obtained from coal in the absence of air and contains nitrogen and carbon dioxide.
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Answer 2

Explanation:

Other properties, such as hardness, grindability, ash-fusion temperature, and free-swelling index (a visual measurement of the amount of swelling that occurs when a coal sample is heated in a covered crucible), may affect coal mining and preparation, as well as the way in which a coal is used.