Fuels and Combustion
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its

Friability & oxygen content
Calorific value
Yield of carbonised products
Caking index

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Fuels and Combustion
Fussain

All of these
Has highest fixed carbon and lowest volatile matter content of all the four banded components of coal
Is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation
Is friable, charcoal like substance

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