Yield of elemental phosphorous from rock phosphate is about __________ percent.
A. 1-2
B. 15-25
C. 40-45
D. 60-65
Answer: Option B
A. 1-2
B. 15-25
C. 40-45
D. 60-65
Answer: Option B
Heating of orthophosphoric acid to about 900°C, produces
A. Metaphosphoric acid
B. Pyrophosphoric acid
C. No change in it
D. None of these
A potassic fertiliser contains 50% K2O. It could be
A. Potassium sulphate
B. Potassium chloride
C. A mixture of NaCl + KCl
D. None of these
Liquid ammonia is not used as such a fertiliser in tropical countries like India, because
A. Its N₂ content is very low
B. It is very costly
C. It will evaporate on spraying
D. It is not available
A. Urea
B. CAN
C. Ammonium sulphate
D. Calcium cyanamide
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