Urea, a commonly used nitrogen-based fertiliser, is prepared by the reaction between ammonia and ______.

  1. carbon dioxide
  2. hydrogen
  3. oxygen
  4. sulphur


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  1. The correct answer is carbon dioxide.

    Key Points

    • Urea is now prepared commercially from liquid ammonia and liquid carbon dioxide.
    • The chemical name of urea is carbamide, the diamide of carbonic acid.
    • Its formula is H2NCONH2.
    • Urea has important uses as a fertilizer and feeds supplement.
    • It is a colourless substance existing in the crystalline form, which melts at 132.7°C (271° F).
    • Urea is a waste product in the body with no physiological function.
    • It dissolves in the kidney and blood before it is excreted as urine.

    Important Points

    • Uses of Urea
      • It is mainly used as a nitrogen release fertilizer.
      • Urea is used as a stabilizer in most nitrocellulose explosive products.
      • It is used in manufacturing high explosive materials like urea nitrate (CH5N3O4).
      • It is used as an important reagent in lanthanide chemistry.
      • It is used in creams/ointments that are used for rehydration.
      • It is used in hair removal creams and dish soaps.
      • It is used as a browning agent for pretzels.
      • It is used in manufacturing melamine.
      • It is used to detect the bacteria in the stomach through the urea breath test.
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