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E-PolyLearning

46. Prilling tower is found in the flowsheet for the manufacture of
a. ammonia
b. urea
c. superphosphate
d. triple superphosphate
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Answer: (b).urea

47. Reaction of orthophosphoric acid with soda ash produces
a. sodium tripolyphosphate (STPP)
b. tricresyl phosphate
c. tributyl phosphate
d. nitrophosphate
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Answer: (a).sodium tripolyphosphate (STPP)

48. Urea is formed only
a. in liquid phase
b. in vapour phase
c. at very high temperature
d. at very low pressure (vacuum)
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Answer: (a).in liquid phase

49. Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.
a. reversible
b. catalytic
c. exothermic
d. endothermic
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Answer: (d).endothermic

50. Electric process as compared to wet process (for the manufacture of phosphoric acid)
a. can use only high grade phosphate rock.
b. is used less frequently.
c. produces a valuable by-product called gypsum.
d. is weak acid process.
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Answer: (b).is used less frequently.