Fuels and Combustion
Washing of coal

Controls its ash fusibility and increases its calorific value
Reduces its sulphur and ash content
Improves its coking properties
All of these

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Fuels and Combustion
Calorific value of

N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is lower than that of equivalent olefins
Light paraffinic fuel oils is higher than that of equivalent olefins
Light paraffinic fuel oils is equal to that of equivalent olefins

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