Which of the following is considered as the lowest rank of coal?

Peat

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Lignite

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Bituminous

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None of the above

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Solution

The correct option is A Lignite
Wood and other vegetable matter decayed and transformed under pressure millions of years ago to form coal. Lignite has a lower rank in the coalification process, lower than bituminous and anthracite coals. It has a low calorific value. Thus, the correct answer is option B.

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