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Semi-bituminous coal are harder than anthracite coal.

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Semi-bituminous coal are harder than anthracite coal.

(a) True

(b) False

I have been asked this question in homework.

I need to ask this question from Solid Fuels topic in section Fuels and Combustion of Engineering Chemistry II

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Right answer is (b) False

The best explanation: Anthracite are the highest grade of coal which consists of 93-98 % carbon is the hardest of all the coal. It has low volatile content. Semi-bituminous coal are softer than anthracite but harder than bituminous coal.

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