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Fertiliser Technology

Fertiliser Technology
Action of phosphoric acid on rock phosphate produces

Superphosphate
Nitrophosphate
Triple superphosphate
Diammonium phosphate

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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
98
82
38

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Fertiliser Technology
Conditioners like finely divided peat are added to the fertiliser to

Produce bulk
Counteract burning
Increase its solubility
Avoid caking & hardening

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Fertiliser Technology
Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because

It is a liquid at room temperature
Its nitrogen content is very less
It is hygroscopic and explosive in nature
It is highly acidic in nature

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Fertiliser Technology
Ammonia synthesis gas is produced from fuel oil by

Steam reforming
Partial oxidation
Hydrocracking
Hydrogenation

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Fertiliser Technology
Ammonium nitrate (a fertiliser) is coated with limestone powder to

Cut down its production cost
Avoid the risk of explosion
Increase its nitrogen content
Add extra nutrient as fertiliser

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