Fertiliser Technology problems
- 1. pH value of soil is maintained at __________ by the addition of fertiliser for optimum growth and health of the plant.
Options- A. 4-5
- B. 7-8
- C. 9-10
- D. 12-13 Discuss
Correct Answer: 7-8
- 2. Yield of elemental phosphorous from rock phosphate is about __________ percent.
Options- A. 1-2
- B. 15-25
- C. 40-45
- D. 60-65 Discuss
Correct Answer: 15-25
- 3. A phosphatic fertiliser contains 16% P2O5. It could be
Options- A. dicalcium phosphate
- B. superphosphate
- C. triple superphosphate
- D. none of these Discuss
Correct Answer: superphosphate
- 4. CaH4(PO4)2 is the chemical formula of
Options- A. superphosphate
- B. triple superphosphate
- C. calcium phosphate
- D. meta phosphoric acid Discuss
Correct Answer: triple superphosphate
- 5. Which of the following is the costliest source of hydrogen needed for ammonia manufacture under Indian condition?
Options- A. Electrolysis of water.
- B. Cryogenic removal of H2 from coke oven gas.
- C. Steam reforming of naphtha.
- D. Natural gas cracking. Discuss
Correct Answer: Electrolysis of water.
- 6. Flushing liquor used for cooling coke oven gas constitutes of
Options- A. ammoniacal liquor
- B. K2CO3 solution
- C. dilute H2SO4
- D. dilute HCl Discuss
Correct Answer: ammoniacal liquor
- 7. Liquid ammonia and 60% nitric acid reaction (which produces ammonium nitrate) is
Options- A. exothermic
- B. endothermic
- C. autocatalytic
- D. none of these Discuss
Correct Answer: exothermic
- 8. Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the
Options- A. presence of an inert atmosphere.
- B. presence of a reducing atmosphere.
- C. absence of air.
- D. presence of an oxidising atmosphere. Discuss
Correct Answer: absence of air.
- 9. Main constituent of phosphate rock is
Options- A. ammonium phosphate
- B. flour apatite
- C. calcium fluoride
- D. calcium phosphate Discuss
Correct Answer: flour apatite
- 10. Temperature and pressure in ammonia converter is
Options- A. 200 atm, 1000°C
- B. 450 atm, 200°C
- C. 450 atm, 550°C
- D. 450 atm, 1000°C Discuss
Correct Answer: 450 atm, 550°C
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