____________ is a grade between bituminous coal and anthracite.
A
steam coal
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B
sea coal
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C
both A and B
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D
none of these
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Solution
The correct option is C both A and B The rank of coal is based on the degree to which the original plant material is converted into carbon. There are four types of coal-
(i) Anthracite
(ii) Bituminous
(iii) Sub-bituminous
(iv) Lignite
While, steam coal and sea coal is grade between bituminous coal and anthracite.