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Urea is manufactured from

  • A.ammonia with sulphuric acid
  • B.ammonium nitrate with lime
  • C.ammonia and carbon dioxide
  • D.ammonia with nitric acid

Answer: C

Ammonium carbamate forms first and then dehydrates to urea, and both steps occur in the same reactor. The carbon dioxide comes conveniently from the reforming section of the ammonia plant. The two steps share the same high pressure reactor.

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