Q.

Which of the coal have the best heating values in terms of volatile matter?

A. containing 20% volatile matter
B. containing 60% volatile matter
C. containing 30% volatile matter
D. containing 50% volatile matter
Answer» A. containing 20% volatile matter
Explanation: coals containing high volatile matter produces long and smoky flame due to which its heating value decreases. semi- bituminous coal has the highest heating value due to less volatiles content.
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