Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?
Correct answer: D. Friability & oxygen content
- A. Caking index
- B. Yield of carbonised products
- C. Calorific value
- D. Friability & oxygen content
Explanation
Weathering oxidizes coal and weakens its structure, making it more friable while increasing its oxygen content. It generally lowers rather than raises the calorific value.
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