Question

Among the following four types/grades of coal, which has the lowest carbon content?

• A. Anthracite
• B. Bituminous
• C. Sub-bituminous
• D. Lignite

Answer 1

The correct option is D Lignite

Lignite or Brown Coal – It is considered to be the coal of lowest rank as it is the youngest of all. It only contains nearly 25-35 percent of carbon.
Sub-bituminous Coal – This coal is also known as black Ignite.
Bituminous Coal – This coal is dark and hard.
Anthracite Coal – This coal is of the highest rank as it contains 94-98 percent of carbon.