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Crude petroleum is refined by the use of

  • A.Citric acid
  • B.Sulphuric acid
  • C.Hydrochloric acid
  • D.Bleaching powder

Answer: B

Sulphuric acid is used in refining crude petroleum, in the treating stages that remove sulphur compounds, unsaturated hydrocarbons and gums from the distilled fractions.

The separation of the crude into fractions is done by distillation; the acid treatment is what cleans those fractions up afterwards.

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