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Which is the highest quality of hard coal

This question belongs to General Knowledge Chemistry
Chemistry
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Which is the highest quality of hard coal?

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Correct Answer: Option A
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.
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