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Fertiliser Technology

Fertiliser Technology
Chemical formula of metaphosphoric acid is

H₃PO₄
Same as that of pyrophosphoric acid
HPO₃
H₄P₂O₇

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Fertiliser Technology
Iron is not used alone as a catalyst in ammonia synthesis, because

It decomposes ammonia
It gets oxidised above 500°C
None of these
Its activity declines rapidly, if heated to above 520°C

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Fertiliser Technology
Reaction of calcium fluorapatite with sulphuric acid produces

Simple superphosphate
Ortho-phosphoric acid
Red phosphorous
Triple superphosphate

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Fertiliser Technology
Main constituent of phosphate rock is

Flour apatite
Calcium fluoride
Ammonium phosphate
Calcium phosphate

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Fertiliser Technology
CO₂ present in reformed gas (obtained by steam reforming of naphtha) is removed by absorbing in

Ammoniacal liquor
Methyl-Ethyl Ketone (MEK)
Mono-ethanolamine (MEA)
Slaked lime

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Fertiliser Technology
Reaction of cresylic acid with __________ produces tricresyl phosphate.

Calcium phosphate
Phosphorous pentoxide
Phosphorous oxychloride
Ammonium phosphate

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