Which among the following types of coal produces most heat per unit?
(1) Coal
(2) Lignite
(3) Anthracite
(4) Pit
Which among the following types of coal produces most heat per unit?
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Correct Answer – (3) Anthracite
Explanation: The heat content of anthracite ranges from 22 to 28 million Btu per short ton (26 to 33 MJ/kg) on a moist, mineral-matter-free basis. Anthracite (“coal-like”) is a hard, compact variety of mineral coal that has a high luster. It has the highest carbon content, the fewest impurities, and the highest calorific content of all types of coals, which also include bituminous coal and lignite.