This set of Chemical Industry Multiple Choice Questions & Answers (MCQs) focuses on “Inorganic Chemical – Urea – 1”.
1. What is the molecular weight of Urea?
a) 60
b) 70
c) 80
d) 90
View Answer
Explanation: Molecular formula of Urea is NH2CONH2. Weight of nitrogen, oxygen, carbon and hydrogen is 14, 16, 12 and 1 respectively. Therefore, Weight of Urea = 14*2+4+12+16 = 60.
2. For which of the mentioned does Urea serve the purpose?
a) Fertilizer
b) Formaldehyde resins
c) Melamine
d) All of the mentioned
View Answer
Explanation: Urea is used as solid fertilizer (53%), liquid fertilizer (31%) and other miscellaneous applications such as animal feed, formaldehyde resins, melamine and adhesives.
3. Urea-ammonium nitrate solution is regarded as which of the mentioned?
a) Nitrogen fertilizer
b) Phosphate fertilizer
c) Potassium fertilizer
d) Mixed fertilizer
View Answer
Explanation: Urea-ammonium nitrate solution is most popular nitrogen fertilizer.
4. Which of the mentioned statements is true?
a) Melamine is synthesized by condensation of urea molecules
b) Melamine is synthesized by thermal cracking hydrocarbons
c) Melamine is synthesized by polymerization of urea molecules
d) None of the mentioned
View Answer
Explanation: Melamine is synthesized by condensation of urea molecules.
5. Ammonium carbamate decomposition results in which of the mentioned?
a) Urea
b) DDT
c) Ammonium nitrate
d) Ammonium hydroxide
View Answer
Explanation: Ammonium carbamate decomposition is one of the methods of producing urea.
6. What kind of reaction takes place when compressed ammonia and CO2 are reacted?
a) Highly Endothermic
b) Exothermic
c) Endothermic
d) None of the mentioned
View Answer
Explanation: When ammonia and CO2 are compressed separately and reacted, reaction is a exothermic in nature with ΔΗo = -37.4 Kcal.
7. Into which of the mentioned equipment are compressed NH3 and CO2 added for production of urea by Ammonia carbamate decomposition?
a) CSTR
b) Parr Reactor
c) Autoclave
d) Plug type reactor
View Answer
Explanation: Ammonia and CO2 are compressed separately and added to a high-pressure autoclave, which is water -cooled.
8. What is the average residence time of the autoclave on continuous basis when fed with compressed ammonia and CO2?
a) 1-2 hours
b) 1.5-2 hours
c) 1.5-2.5 hours
d) 1.5-3 hours
View Answer
Explanation: The average residence time in the autoclave, which is operated on continuous basis, is 1.5-2 hours.
9. What are the resultant compounds after reaction of compressed NH3 and CO2 in autoclave on continuous basis?
a) Urea
b) Ammonium Carbamate
c) H2O
d) All of the mentioned
View Answer
Explanation: A mixture of urea, ammonium carbamate, H2O and unreacted NH3+CO2 results after reaction between compressed CO2 and NH3 in an autoclave.
10. In which of the mentioned equipment does further decomposition of carbamate take place?
a) Atmospheric flash drum
b) Flash evaporator
c) Distillation tower
d) Cooling tower
View Answer
Explanation: The aqueous solution of carbamate and urea is passed to the atmospheric flash drum for further decomposition of carbamate.
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