___ is higher in coke than in coal.
Thus, carbon is higher in coke than in coal.
Which of the following is usually referred to as 'black gold' ?
(a) coke
(b) coal tar
(c) petroleum
(d) coal
Which of the following is used as a reducing agent in the extraction of iron metal ?
(a) coal
(b) bitumen
(c) charcoal
(d) coke