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Fertiliser Technology

Fertiliser Technology
Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium

Carbonate
Phosphate
Silicate
Bicarbonate

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Fertiliser Technology
NPK fertiliser is a __________ fertiliser.

Nitrogenous
Complex
Mixed
Phosphatic

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Fertiliser Technology
Reaction of anhydrous liquid ammonia with orthophosphoric acid produces

Superphosphate
Triple superphosphate
None of these
Ammonium phosphate

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Fertiliser Technology
In the manufacture of urea, the intermediate chemical formed is

Biuret
None of these
Ammonium carbamate
Ammonium carbonate

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Fertiliser Technology
Both white phosphorous as well as red phosphorous

Are soluble in CS₂
Reacts with hot caustic soda solution to give phosphine
All of these
Burns when heated in air

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Fertiliser Technology
In an ammonia plant, the purge off is essential to

Remove uncondensed ammonia vapour
Maintain inert gas concentration within a limit
Maintain H₂ : N₂ ratio at 3 :1
Remove excess poisonous gases

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