Discussion
Coals are ranked from peat through lignite and bituminous to anthracite in order of increasing
Answer: D
Correct answer: carbon content
The coalification series - peat, lignite, sub-bituminous, bituminous, anthracite - is a progressive loss of moisture and volatile matter and a corresponding enrichment in fixed carbon. Carbon content therefore rises monotonically along the series, and it is the property rank is defined by. Moisture and volatile matter fall along the same series, and ash content depends on the deposit rather than on rank.
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