Discussion
X and Y are thick, black liquids which can be used for metalling the roads. X is derived from petroleum and Y is derived from coal. Which of the following can X and Y respectively be ?
Answer: A
X and Y are Bitumen, Coal Tar.
Bitumen is a thick black residue obtained in the refining of petroleum and is now the main binder for metalling (surfacing) roads. Coal tar is a thick black liquid obtained when coal is processed (heated in the absence of air); it was used for road surfacing before bitumen replaced it.
Charcoal is a solid fuel from wood, not a liquid, and option D reverses the sources of the two liquids.
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