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Select the correct statement among the given below.

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Select the correct statement among the given below.

(a) All coking coals are caking but not all caking coals are coking

(b) All caking coals are coking but not all coking coals are caking

(c) Coking and caking are the same types of coals

(d) All types of coals can be coked

I got this question in homework.

My question is taken from Carbonization of Coal topic in division Fuels and Combustion of Engineering Chemistry II

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Correct choice is (a) All coking coals are caking but not all caking coals are coking

The explanation is: All coking coals are caking but not all caking coals are coking.Only that coal which has a tendency to soften, swell and stick together during strong heating in absence of air can be coked.

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