A) Coal is a mineral and burns releasing smoke while coke is a residue.
B) Coal is an impure form of carbon, while coke is a pure form of carbon.
C) Only coal consists of atoms of carbon, hydrogen, oxygen and sulphur while coke mainly consists of carbon.
D) All of the above
Correct Answer: D
Solution :
Coke is almost a pure form of carbon, it is a good fuel and burns without smoke. While coal is an impure form of carbon and burns releasing smoke.
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