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Which of the following substance contributes towards its heating value?

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Which of the following substance contributes towards its heating value?

(a) Nitrogen

(b) Hydrogen

(c) Sulphur

(d) Oxygen

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Question is from Coal topic in division Fuels and Combustion of Engineering Chemistry II

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Right option is (c) Sulphur

Explanation: Pure sulphur contributes towards the heating effect of coal, whereas the combustion products of sulphur such as SO2 and SO3 have corrosion effects on the equipment. Nitrogen present in the coal is of negligible amount due to which it does not have effect on properties of coal.

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