3765. Heating a mixture of phosphate rock, coke and sand in an electric furnace produces
Phosphoric acid
Ammonium phosphate
Phosphorous
Superphosphate
✅ The correct answer is option C.
3767. Ammonium nitrate (a fertiliser) is coated with limestone powder to
Increase its nitrogen content
Cut down its production cost
Avoid the risk of explosion
Add extra nutrient as fertiliser
✅ The correct answer is option C.
3772. Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in
Low bulk density product
Biuret formation
Non-spherical prills
Substantially wet non-flowing and sticky product
✅ The correct answer is option B.
3776. Nitrogenous fertiliser is required
During the early stage of growth to promote development of stem and leaves
For accelerating fruit formation in later stage of growth
To lessen the effect of excessive potash application
None of these
✅ The correct answer is option A.
3781. Heating of orthophosphoric acid to about 900°C, produces
Metaphosphoric acid
Pyrophosphoric acid
No change in it
None of these
✅ The correct answer is option A.
3750. Urea is a __________ fertiliser.
Nitrogenous
Potassic
Phosphatic
None of these
✅ The correct answer is option A.
3755. Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium
Carbonate
Phosphate
Bicarbonate
Silicate
✅ The correct answer is option A.
3760. Reaction of phosphate rock with 98% H₂SO₄ produces
Orthophosphoric acid
Superphosphate
White phosphorous
None of these
✅ The correct answer is option A.
3762. A potassic fertiliser contains 50% K₂O. It could be
Potassium sulphate
Potassium chloride
A mixture of NaCl+ KCl
None of these
✅ The correct answer is option A.
3768. Reaction of calcium fluorapatite with sulphuric acid produces
Ortho-phosphoric acid
Simple superphosphate
Triple superphosphate
Red phosphorous
✅ The correct answer is option B.