Fuels and Combustion
Grindability index of a coal is 100. It implies that the

Power consumption in grinding the coal will be very high
Coal can be pulverised with great difficulty
Coal can't be pulverised
Coal can be easily pulverised

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Fuels and Combustion
Lignite is

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

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