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Fertiliser Technology

Fertiliser Technology
Maximum stability of white phosphorous is at

Very high pressure
Room temperature
Atmospheric pressure
>600°C

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Fertiliser Technology
In the manufacture of orthophosphoric acid by strong H₂SO₄ leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable

Pyrophosphoric acid
CaSO₄ .½H₂O and CaSO₄ crystals
All of these
Metaphosphoric acid

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Fertiliser Technology
During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH₃ to NO is about __________ percent.

68
38
82
98

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Fertiliser Technology
Which of the following is not a commercially used feed-stock for the production of ammonia synthesis gas?

Naphtha
Water
Tar
Coal/coke oven gas

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Fertiliser Technology
Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.

High corrosion rate
Increased cost of equipment
Increased biuret formation
All of these

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Fertiliser Technology
Which nutrient in fertiliser makes the plant stems stronger and increases branching?

Phosphorous
Calcium
Nitrogen
Potassium

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