What are the four varieties of coal in the increasing order of carbon content?

Lignite, Peat, Bituminous, Anthracite

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Peat, Lignite, Anthracite, Bituminous

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Peat, Bituminous, Lignite, Anthracite

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Peat, Lignite, Bituminous, Anthracite

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Solution

The correct option is D Peat, Lignite, Bituminous, Anthracite
Peat is the first stage in the formation of coal. It is light brown in colour and contains 50 to 60 $%$ carbon. So it is the most inferior type of coal. Lignite is the second stage in the formation of coal. It contains more than 60 $%$ carbon. Bituminous is the third stage in the formation of coal. There are high, medium and low varieties of bituminous coal, with carbon content being 90 $%$ , 80 $%$ and 70-75 $%$ respectively. Anthracite is the purest variety of coal. Its carbon content varies between 92-98 $%$ .

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