Question

why is lignite coal brown in colour while bituminous coal is black

Answer 1

because you will we get Kol from the nature It is crude cold water and its refine it get in black colour

Answer 2

Lignite coal is brown in colour because it contains a small percent of carbon.
It contains carbon around 25 to 35% whereas bituminous coal ranges black in colour due to good amount of carbon present in it.
The amount of carbon present in bituminous coal is 45 to 85 %.
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