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Fertiliser Technology

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

Carbonate
Phosphate
Bicarbonate
Silicate

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

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

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Fertiliser Technology
Potassic fertilisers do not promote the development of

Starches of potatoes & grains
Fibrous materials of plants
Sugar of fruits & vegetables
Stems & leaves during early stage of plant growth

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Fertiliser Technology
Ammonium nitrate (a fertiliser) is coated with limestone powder to

Cut down its production cost
Avoid the risk of explosion
Add extra nutrient as fertiliser
Increase its nitrogen content

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Fertiliser Technology
Ammonium sulphate can be produced by reacting gypsum with

Ammonia
Nitric acid
None of these
Ammonium carbonate

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Fertiliser Technology
Red phosphorous is changed into white phosphorous by

Vaporisation followed by condensation
Melting under pressure
None of these
Heating in presence of light

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