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Fertiliser Technology

Fertiliser Technology
Heating of orthophosphoric acid to 250°C produces

No change in it
None of these
Pyrophosphoric acid
Metaphosphoric acid

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Fertiliser Technology
Both white phosphorous as well as red phosphorous

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

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Fertiliser Technology
Which of the following fertilisers is used as a cattle feed?

Urea
Ammonium sulphate
Superphosphate
Calcium ammonium nitrate

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Fertiliser Technology
Reaction of calcium fluorapatite with sulphuric acid produces

Red phosphorous
Triple superphosphate
Ortho-phosphoric acid
Simple superphosphate

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Fertiliser Technology
Catalyst used in desulphurisation of naphtha is

Co-Mo
Nickel
Pt-Rh
Silica gel

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Fertiliser Technology
Low grade phosphate rock can be used in electrical furnace, because

It produces low cost product
Of the better CaO/SiO₂ balance for slag formation
It is cheap
CaO content is less

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