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Fertiliser Technology

Fertiliser Technology
Dehydration of ammonium carbamate produces

None of these
Ammonia water
Biuret
Urea

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Fertiliser Technology
Chemical formula of biuret is

NH₄COONH₂
NH₃.COO.NH₃
NH₂.CO.NH₂
NH₂CONHCONH₂

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Fertiliser Technology
Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in

Biuret formation
Non-spherical prills
Substantially wet non-flowing and sticky product
Low bulk density product

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Fertiliser Technology
Iron is not used alone as a catalyst in ammonia synthesis, because

It gets oxidised above 500°C
Its activity declines rapidly, if heated to above 520°C
None of these
It decomposes ammonia

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Fertiliser Technology
Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.

Improving the strength & heat resistance
All of these
Increasing the effectiveness
Stabilisation

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

Pyro
Ortho
Meta
None of these

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