Which one of the following set of raw material is most suitable for manufacture of urea ?
Correct answer: A. CH4 N2 and CO2
- A. CH4 N2 and CO2
- B. H2 N2 and CO
- C. H2 CO2 and H2O
- D. H2O N2 and H2
Explanation
Industrial urea is manufactured from ammonia and carbon dioxide: 2NH3 + CO2 produces CO(NH2)2 + H2O. Ammonia is made from CH4, N2 and steam, so methane, nitrogen and carbon dioxide are the most suitable overall raw materials. Students may choose H2 and N2 because these form ammonia, but that option does not provide the carbon dioxide needed for urea.
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About Polymers
Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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