Coal containing large quantity of _______________ are difficult to wash?
Correct answer: B. Inherent mineral matter
- A. Ash
- B. Inherent mineral matter
- C. Free impurities
- D. Volatile matter
Explanation
Inherent mineral matter is finely distributed within the coal particles, so ordinary washing cannot separate it effectively. Free impurities are present as separate particles and are comparatively easier to remove.
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