The calorific values of wood, bituminous coal, natural gas and charcoal vary in the order:

Wood > Bituminous coal > Natural gas > Charcoal

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Wood > Bituminous coal > Charcoal > Natural gas

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Natural gas > Charcoal > Bituminous coal > Wood

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Natural gas > Bituminous coal > Wood > Charcoal

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Solution

The correct option is C Natural gas > Charcoal > Bituminous coal > Wood
Calorific value of liquid fuel is higher than that of solid fuels. With the progress of coal forming reaction, moisture content and oxygen content reduces and percentage of carbon increases. Also calorific value increases from peat to bituminous.
Natural gas > Charcoal > Bituminous coal > Wood

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