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Oleum is

  • A.sulphur trioxide dissolved in strong acid
  • B.sulphuric acid diluted with a little water
  • C.a mixture of sulphuric and nitric acids
  • D.sulphur dioxide dissolved in the water

Answer: A

It is also called fuming sulphuric acid and is used where a water-free sulphonating agent is needed. Diluting it with water gives sulphuric acid of any strength up to a hundred per cent. It is shipped as a convenient form of the trioxide.

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