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- Question
Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
Options- A. 50-80
- B. 250-400
- C. 1000-1200
- D. 800-900
- Correct Answer
- 250-400
- 1. In calcium ammonium nitrate (CAN) fertil-ser
Options- A. nitrate nitrogen is quick acting
- B. ammoniacal nitrogen is quick acting
- C. nitrate nitrogen is slower acting
- D. none of these Discuss
- 2. Catalyst used in the manufacture of NH3 by Haber's process is finely divided
Options- A. nickel
- B. iron
- C. vanadium pentoxide
- D. alumina Discuss
- 3. Ammonium nitrate (a fertiliser) is coated with limestone powder to
Options- A. increase its nitrogen content.
- B. cut down its production cost.
- C. avoid the risk of explosion.
- D. add extra nutrient as fertiliser. Discuss
- 4. Pick out the wrong statement.
Options- A. 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid.
- B. Chemically unreactive nature of red phosphorous is due to its polymeric structure.
- C. Red phosphorous is the most reactive allotropic form of phosphorous.
- D. Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation. Discuss
- 5. Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.
Options- A. Haber's
- B. Stengel
- C. Le-chatlier's
- D. Du-pont's Discuss
- 6. Electric process as compared to wet process (for the manufacture of phosphoric acid)
Options- 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. Discuss
- 7. Pick out the wrong statement.
Options- A. All the nitrogenous fertilisers are not soluble in water.
- B. A straight fertiliser contains only one nutrient.
- C. Calcium cynamide is used as weed killer in onion fields.
- D. The phosphorous nutrient makes the plant stem stronger and increases its branches. Discuss
- 8. Steam reforming of naphtha is a source of hydrogen production for nitrogeneous fertiliser industry. What is the usual ratio of steam to carbon maintained in the process of steam reforming of naphtha?
Options- A. 1.5:1
- B. 3.5:1
- C. 10:1
- D. 15:1 Discuss
- 9. Liquid ammonia is not used as such a fertiliser in tropical countries like India, because
Options- A. its N2 content is very low.
- B. it is very costly.
- C. it will evaporate on spraying.
- D. it is not available. Discuss
- 10. 6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be __________ gm.
Options- A. 0.5
- B. 1
- C. 3
- D. 5 Discuss
Fertiliser Technology problems
Search Results
Correct Answer: nitrate nitrogen is quick acting
Correct Answer: iron
Correct Answer: avoid the risk of explosion.
Correct Answer: Red phosphorous is the most reactive allotropic form of phosphorous.
Correct Answer: Stengel
Correct Answer: is used less frequently.
Correct Answer: All the nitrogenous fertilisers are not soluble in water.
Correct Answer: 3.5:1
Correct Answer: it will evaporate on spraying.
Correct Answer: 0.5
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