Which is the most matured coal ?
Correct answer: D. Anthracite
- A. Lignite
- B. Bituminous
- C. Semi-anthracite
- D. Anthracite
Explanation
Coal maturity increases from lignite through bituminous and semi-anthracite to anthracite. Anthracite has the highest carbon content and lowest volatile matter, making it the most matured coal.
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