top layer formed during distillation of coal is
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Destructive distillation is a chemical process of the decomposition of unprocessed material by heating it to a high temperature.
It is the processing of organic material in the absence of air or in the presence of limited amounts of oxygen. It is an application of pyrolysis.
This process breaks up or 'cracks' large molecules. Coke, coal gas, gas carbon, coal tar, ammonia liquor, and "coal oil" are examples of commercial products historically produced by the destructive distillation of coal.
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