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Fertiliser Technology

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
The main constituent of rock phosphate is

Fluorspar
Di-calcium phosphate
Mono-calcium phosphate
None of these

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Fertiliser Technology
NPK means a __________ fertiliser.

Solid
Potassic
Liquid
Mixed

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Fertiliser Technology
Chemical formula of biuret is

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

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Fertiliser Technology
Commercial fertilisers are available mostly in the form of

Powder
Flakes
Lumps
Grannules

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

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