Fertiliser Technology problems
- 1. Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature
Options- A. rate of reaction is very low.
- B. very high pressure is required resulting in costly pressure vessel.
- C. space velocity of gas is very low resulting in decreased conversion.
- D. none of these Discuss
Correct Answer: rate of reaction is very low.
- 2. P2O5 content in superphosphate is about __________ percent.
Options- A. 30-35
- B. 15-20
- C. 65-70
- D. 85-90 Discuss
Correct Answer: 15-20
- 3. Which of the following fertilisers is required for the development of fibrous materials of the plants and of the sugar of vegetable & fruits?
Options- A. Nitrogenous fertilisers
- B. Phosphatic fertilisers
- C. Potassic fertiliser
- D. None of these Discuss
Correct Answer: Potassic fertiliser
- 4. In the manufacture of orthophosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable
Options- A. CaSO4 .
H2O and CaSO4 crystals - B. pyrophosphoric acid
- C. metaphosphoric acid
- D. all (a), (b) and (c). Discuss
Correct Answer: CaSO4 .
H2O and CaSO4 crystals - 5. Out of the following, N2 content is minimum in
Options- A. urea
- B. ammonium nitrate
- C. ammonium sulphate
- D. ammonium chloride Discuss
Correct Answer: ammonium sulphate
- 6. In an ammonia plant, the purge off is essential to
Options- A. maintain inert gas concentration within a limit.
- B. remove excess poisonous gases.
- C. maintain H2 : N2 ratio at 3 :1.
- D. remove uncondensed ammonia vapour. Discuss
Correct Answer: maintain H2 : N2 ratio at 3 :1.
- 7. Urea is a better fertilizer than ammonium sulphate, because
Options- A. it is cheaper.
- B. nitrogen content is higher.
- C. it is not poisonous.
- D. it is easy to manufacture. Discuss
Correct Answer: nitrogen content is higher.
- 8. A mixture of phosphate rock __________ is heated in an electric furnace to produce phosphorous.
Options- A. salt & coke
- B. sand & coke
- C. and coke
- D. and sand Discuss
Correct Answer: sand & coke
- 9. Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the
Options- A. osmotic pressure of the soil water becomes less than that of the plant sap.
- B. soil becomes too alkaline.
- C. osmotic pressure of the soil water becomes higher than that of the plant sap.
- D. soil becomes too acidic. Discuss
Correct Answer: osmotic pressure of the soil water becomes higher than that of the plant sap.
- 10. Potassic fertilisers
Options- A. are useful during early stage of the plant growth.
- B. stimulate early growth and accelerate seeding.
- C. help in development of starches of potatoes and grain.
- D. none of these. Discuss
Correct Answer: help in development of starches of potatoes and grain.
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