Question

How is urea prepare on large scale? How does it react with
(a) HNO2
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Answer 1

Answer:

Urea is now prepared commercially in vast amounts from liquid ammonia and liquid carbon dioxide. These two materials are combined under high pressures and elevated temperatures to form ammonium carbamate, which then decomposes at much lower pressures to yield urea and water.

Nitrogen may be obtained in the elementary form by heating urea with nitrous acid. Nitrous acid is unstable and is always prepared in situ by the action of dilute sulphuric acid on sodium or potassium nitrite.

Explanation:

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