21. Red phosphorous is changed into white phosphorous by
Heating in presence of light
Melting under pressure
Vaporisation followed by condensation
None of these
✅ The correct answer is option C.
Fertilizer Technology MCQs
22. Reaction of __________ acid with phosphate rock produces superphosphates.
Hydrochloric
Sulphuric
Nitric
Phosphoric
✅ The correct answer is option B.
23. HPO₃ is the chemical formula of __________ phosphoric acid.
Pyro
Ortho
Meta
None of these
✅ The correct answer is option C.
24. Biuret formation in urea is kept at minimum (< 1 %), because it is
Corrosive in nature
Toxic and harmful to some crops
Helpful in decomposition of urea
Explosive in nature
✅ The correct answer is option B.
25. Urea is represented as
NH₂.CO.NH₂
NH₃CO.CH₃
NH.CO₂.NH
NH₃.CO₂.NH₃
✅ The correct answer is option A.
26. Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.
Haber’s
Stengel
Le-chatlier’s
Du-pont’s
✅ The correct answer is option B.
27. Which of the following is not a mixed fertiliser?
Nitrophosphate
Calcium ammonium nitrate (CAN)
Ammonium phosphate
None of these
✅ The correct answer is option B.
28. Plant tranquillisers
Hold back stem growth and halt plants at a desired height
Cause early maturation of plants
Accelerate ripening of food and grain
Produce seedless fruit
✅ The correct answer is option A.
29. Potassic fertilisers
Are useful during early stage of the plant growth
Stimulate early growth and accelerate seeding
Help in development of starches of potatoes and grain
None of these
✅ The correct answer is option C.
30. Optimum reaction temperature in steam reforming of naphtha is __________ °C.
700 – 1000
300 – 450
1500-1700
100-200
✅ The correct answer is option A.