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Fertiliser Technology

Fertiliser Technology
HPO₃ is the chemical formula of __________ phosphoric acid.

Meta
Ortho
Pyro
None of these

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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.

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

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Fertiliser Technology
Urea is formed only

In liquid phase
In vapour phase
At very high temperature
At very low pressure (vacuum)

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Fertiliser Technology
Heating of orthophosphoric acid to 250°C produces

None of these
Pyrophosphoric acid
No change in it
Metaphosphoric acid

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Fertiliser Technology
Reaction of orthophosphoric acid with soda ash produces

Nitrophosphate
Sodium tripolyphosphate (STPP)
Tricresyl phosphate
Tributyl phosphate

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

Endothermic
Catalytic
Exothermic
Reversible

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