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Which type of coals are non-caking in nature?

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in Engineering Chemistry II by (789k points)
Which type of coals are non-caking in nature?

(a) Steam coals

(b) Gas coals

(c) House coals

(d) Pulverised coals

I had been asked this question in an online quiz.

Question is taken from Characteristics of Coal topic in division Fuels and Combustion of Engineering Chemistry II

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Right answer is (a) Steam coals

Easiest explanation: Steam coals are volatile lignitous coals which are used in steam raising. These coals produce long smoky flames. Gas coals are strongly caking in nature.

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