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Why is the calorific value of anthracite less than that of semi-bituminous coal?

Why is the calorific value of anthracite less than that of semi-bituminous coal? Correct Answer Due to decrease in hydrogen content

Calorific value is directly proportional to the percentile of hydrogen and it does not depend on the percentile of nitrogen. The volatile matter also does not affect the calorific value as they are not obtained after complete combustion.

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