3934. P₂O₅ content in superphosphate is about __________ percent.
30-35
15-20
65-70
85-90
✅ The correct answer is option B.
3902. CaH₄(PO₄)₂ is the chemical formula of
Superphosphate
Triple superphosphate
Calcium phosphate
Meta phosphoric acid
✅ The correct answer is option B.
3908. Which of the following is the costliest method for commercial production of hydrogen for ammonia synthesis?
H? separation from coke oven gas
Steam reforming of naphtha
Cracking of natural gas
Electrolysis of water
✅ The correct answer is option D.
3911. Which of the following gasifiers can be attached to coal based fertiliser plants?
Lurgi (high pressure) gasifier
Kopper-Totzek gasifier
Gasifier working at 20 atm
Gasifier working at 40 atm
✅ The correct answer is option B.
3915. In ammonia synthesis (N₂ + 3H₂ = 2NH₃), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at
Low pressure
High pressure
Very high temperature
Atmospheric pressure; as the pressure has no effect on conversion
✅ The correct answer is option B.
3920. __________ is not a fertiliser.
Calcium ammonium nitrate
Ferrous sulphate
Liquid ammonia
Ammonium sulphate
✅ The correct answer is option B.
3925. Chemical formula of biuret is
NH₂.CO.NH₂
NH₃.COO.NH₃
NH₂CONHCONH₂
NH₄COONH₂
✅ The correct answer is option C.
3930. Leaching of phosphate rock by strong __________ acid produces phosphoric acid.
Sulphuric
Hydrochloric
Either A or B
Neither A nor B
✅ The correct answer is option C.
3935. Which of the following is not a measure component necessarily to be present in fertilisers?
Nitrogen
Potassium
Phosphorous
Sulphur
✅ The correct answer is option D.
3903. Triple superphosphate is chemically represented as
CaF₂.3Ca₃(PO₄)₂
3Ca₃(PO₄)₂
Ca(PO₃)₂
Ca(H₂PO₄)₂
✅ The correct answer is option A.