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Q.

The hardest type of coal is?

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a

Bituminous

b

Anthracite

c

Sub-bituminous

d

Lignite 

answer is B.

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Detailed Solution

Another name for anthracite is hard coal. It is a sub-metallic lustred hard, compact kind of coal. It contains the fewest contaminants and the highest carbon content. It is ranked first in the category of coals and has the highest energy density of all the different forms of coal.
 
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