A. Carbon
B. Hard coal
C. Ammonia
D. None of these
Submitted by: Farjan Ahmed Soomro
Anthracite, often referred to as hard coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.
Correct Answer: Hard coal ✔
Last Updated: March 19, 2019