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Question

The softest and hardest coal among the following are _________ and ___________ respectively.


A
lignite and anthracite
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B
anthracite and bituminous
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C
sub-bituminous and Lignite
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D
anthracite and lignite
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Solution

The correct option is A lignite and anthracite

The types of coal in increasing order of their hardness are:

Lignite < Sub-Bituminous < Bituminous < Anthracite

Hence, lignite is the softest while anthracite is the hardest variety of coal.


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