Which of the following type of coal is the hardest and consists of pure carbon?

Lignite

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Anthracite

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Bituminous

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None of the above

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Solution

The correct option is B
Anthracite

Anthracite is the hardest type of coal; it has the highest heating value and lowest moisture and ash content. It also has very little amount of volatile impurities and hence tends to burn without a flame. The carbon percentage in anthracite usually varies from 87% to 98%.

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