| 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
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| 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)
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| 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
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| 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
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| 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.
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