Q.

Which among the following types of coal produces most heat per unit?

A. Coal
B. Lignite
C. Anthracite
D. Pit
Answer» C. 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.
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