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Which type of coal gets soften on heating?

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in Engineering Chemistry II by (789k points)
Which type of coal gets soften on heating?

(a) Caking coal

(b) Coking coal

(c) Anthracite

(d) Semi-bituminous

I have been asked this question during an interview.

The origin of the question is Secondary Solid Fuels topic in section Fuels and Combustion of Engineering Chemistry II

1 Answer

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The correct option is (a) Caking coal

The explanation: On heating caking coal it gets soften producing a pasty mass which fuses together yielding coherent masses impervious to air. Coals that contains less pasty material are either non-caking or less caking in nature.

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