Urea is formed only____________________?
Correct answer: D. In liquid phase
- A. At very low pressure (vacuum)
- B. In vapour phase
- C. At very high temperature
- D. In liquid phase
Explanation
Industrial urea synthesis occurs in a liquid phase formed from ammonia and carbon dioxide, first producing ammonium carbamate and then urea. High temperature and pressure assist the reaction, but they are not the phase itself.
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