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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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