Fuels and Combustion
Fixed carbon in coal is defined as

The one which is present in the residue after combustion
That present in volatile matters
Hundred minus the percentage of volatile matter, ash and moisture
The total quantity of carbon present in the coal

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Fuels and Combustion
Lignite is

A high rank coal
A black banded coal which burns with a non-smoky yellowish flame
A coking coal
Can be used for gasification and steam generation

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