Which of the following will give off less heat per given unit weight?

Peat

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Lignite

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Bituminous

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Anthracite

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Solution

The correct option is A Peat
Peat has the carbon content of about
Anthracite has the carbon content of above 87%.
Hence, peat has the minimum carbon content and anthracite is the highest ranked coal.
So, peat will produce least heat per given unit weight and the anthracite will produce the highest heat per given unit weight.

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