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A brief information about four substance...

A brief information about four substances P, Q, R and S is given.
P: A dark coloured, viscous, strong smelling liquid which is commercially very important
Q: An almost pure form of carbon which is used in the manufacture of steel and in the extraction of many metals
R: Used in place of coal tar for metalling the roads
S: Used in the manufacture of detergents, fibres, polythene and other man-made plastics
Identify P, Q, R and S.

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The correct Answer is:
A
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