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Fertiliser Technology

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

Ortho
Meta
Pyro
None of these

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Fertiliser Technology
Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it

Has a pungent smell
Vaporises at normal temperature
Is in short supply
Is toxic and highly corrosive

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Fertiliser Technology
Electric process as compared to wet process (for the manufacture of phosphoric acid)

Is weak acid process
Produces a valuable by-product called gypsum
Can use only high grade phosphate rock
Is used less frequently

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Fertiliser Technology
Reaction of orthophosphoric acid with soda ash produces

Sodium tripolyphosphate (STPP)
Tributyl phosphate
Tricresyl phosphate
Nitrophosphate

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Fertiliser Technology
Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the

Presence of an inert atmosphere
Presence of a reducing atmosphere
Absence of air
Presence of an oxidising atmosphere

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Fertiliser Technology
Nitrogen content of a nitrogenous fertiliser is 35%. It could be

Calcium ammonium nitrate (CAN)
Ammonium sulphate
Urea
Ammonium nitrate

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