Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?
Correct answer: B. 10 & 3
- A. 3 & 10
- B. 10 & 3
- C. 10 & 20
- D. 15 & 8
Explanation
Low-temperature carbonisation produces more tar, commonly about 10%, whereas high-temperature carbonisation gives about 3% tar because more vapours are cracked into gas and lighter products. Thus the order is 10% and 3%.
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