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| 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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