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Fertiliser Technology

Fertiliser Technology
P₂O₅ content in superphosphate is about __________ percent.

15-20
85-90
30-35
65-70

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Fertiliser Technology
An increase in the NH₃/CO₂ ratio in urea manufacture results in

Decreased specific volume of molten mass
Decreased yield of urea
Increased degree of conversion of CO₂ to urea
Decreased degree of conversion of NH₃ to urea

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Fertiliser Technology
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the

Presence of an oxidising atmosphere
Presence of a reducing atmosphere
Absence of air
Presence of an inert atmosphere

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Fertiliser Technology
Liquid ammonia is not used as such a fertiliser in tropical countries like India, because

It is not available
Its N₂ content is very low
It is very costly
It will evaporate on spraying

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Fertiliser Technology
H₄P₂O₇ is the chemical formula of __________ phosphoric acid.

Pyro
None of these
Meta
Ortho

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Fertiliser Technology
During conversion of ammonium carbamate into urea, presence of large excess of water

Does not affect the yield of urea
Increases the yield of urea
Reduces the evaporator load by diluting the urea solution
Adversely affects the yield of urea

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