Fuels and Combustion
Low temperature oxidation of stored coal results in the

Decrease in its caking power & calorific value
Decrease in its carbon & hydrogen content
Increase in its oxygen content
All of these

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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