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Fertiliser Technology

Fertiliser Technology
Sodium tri poly phosphate (STPP) is chemically represented as

Na₅P3O₁₀
Na₄P3O₈
Na₂PO₄
Na₃P4O₆

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Fertiliser Technology
Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.

Reversible
Catalytic
Exothermic
Endothermic

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Fertiliser Technology
In calcium ammonium nitrate (CAN) fertil-ser

Nitrate nitrogen is slower acting
Ammoniacal nitrogen is quick acting
None of these
Nitrate nitrogen is quick acting

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Fertiliser Technology
Commercial production of hydrogen for the manufacture of nitrogeneous fertilisers is done by

Cryogenic separation of hydrogen from coke oven gas
Electrolysis of water
All of these
Steam reforming of naphtha and cracking of natural gas

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Fertiliser Technology
Low grade phosphate rock can be used in electrical furnace, because

It produces low cost product
It is cheap
CaO content is less
Of the better CaO/SiO₂ balance for slag formation

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Fertiliser Technology
Oxidation of ammonia is

Autocatalytic
Non-catalytic
Exothermic
Endothermic

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