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Which of the following fuels has the highest calorific value?

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in Applied Chemistry by (101k points)
Which of the following fuels has the highest calorific value?

(a) lignite

(b) wood

(c) bituminous

(d) anthracite

This question was addressed to me during an online exam.

My question is taken from Solid Fuels topic in division Fuel Technologies of Applied Chemistry

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Right option is (d) anthracite

Easy explanation: Anthracite has the calorific value 8650-8700k.cal/kg as the highest one. The calorific values of the others are as follows:

Wood-4000-4500k.cal/kg

Bituminous-8000-8500k.cal/kg

Lignite-6500-7100k.cal/kg.

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