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Which of the following coal have highest volatile matter?

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Which of the following coal have highest volatile matter?

(a) Peat

(b) Lignite

(c) Bituminous

(d) Anthracite

The question was posed to me in quiz.

The above asked question is from Solid Fuels in section Fuels and Combustion of Engineering Chemistry II

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Correct choice is (b) Lignite

The explanation is: Lignite burns with long smoky flame which states that it contains high volatile matter. Lignite absorbs oxygen readily on exposure to air.

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