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Prime coking coal is always blended with medium or non- coking coal before ear-bonisation | |
A. | to check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls. [Wrong Answer] |
B. | because, it alone produces unreactive coke. [Wrong Answer] |
C. | both (a) and (b). [Correct Answer] |
D. | neither (a) nor (b). [Wrong Answer] |