Coal is heated in presence of air to a temperature of about _______________ °C, while determining its ash content for proximate analysis?
Correct answer: B. 750
- A. 500
- B. 750
- C. 950
- D. 1100
Explanation
In proximate analysis, coal is heated in air at approximately 750°C until its combustible matter is removed and only mineral residue remains. The residue is reported as ash.
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