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The contact process makes sulphuric acid by

  • A.catalytic oxidation of sulphur dioxide
  • B.direct combustion of the sulphur in water
  • C.electrolysis of a strong sulphate solution
  • D.reaction of sulphur with nitric acid

Answer: A

Sulphur is burned to the dioxide, which is then oxidised over a catalyst and absorbed. The oxidation step is the one that needed a catalyst and gave the process its name. Sulphur and air are the only raw materials needed.

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