Fuels and Combustion
Low temperature oxidation of coal is accelerated by the

Storage in compressed piles
Absence of porous or friable particles
All of these
Storage in large heaps

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Fuels and Combustion
Cannel coal

Has a high volatile matter content and burns with a luminous smoky flame
Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
Is non-coking
All of these

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