Which among the following types of coal produces most heat per unit? (a) Coal (b) Lignite (c) Anthracite (d) Pit
option C. The warmth content material of anthracite levels from 22 to twenty-eight million Btu consistent with brief ton (26 to 33 MJ/kg) on a moist, mineral-matter-loose basis. Anthracite ("coal-like") is a hard, compact type of mineral coal that has a excessive luster. It has the best carbon content material, the fewest impurities, and the very best calorific content material of all forms of coals, which additionally consist of bituminous coal and lignite.
