What is the percentage of free carbon in anthracite?

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30%

60%

90%

95%

answer is D.

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Detailed Solution

Concept- Anthracite is the coal that has undergone the biggest metamorphosis. It was discovered that the carbon concentration in this ranges from 92 to 98 percent. Anthracite has been discovered to be difficult to ignite and to burn with a blue-colored, smokeless, and brief flame.
Anthracite varies from conventional bituminous coal in that it has a higher hardness and density than normal bituminous coal.
Anthracites are the most expensive coal, costing two to three times as much as normal coal. It is also the highest-ranking of coals.
Anthracite is mostly used as a residential fuel in automatic stoker furnaces and hand-fired stoves today. It produces a lot of energy and only a little soot, making it excellent for this use.
As a result, we can conclude that option 4 is the correct answer, as anthracite contains 95 percent free carbon.
Hence, option 4 is correct.

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