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Fertiliser Technology

Fertiliser Technology
Yield of elemental phosphorous from rock phosphate is about __________ percent.

60-65
1-2
15-25
40-45

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Fertiliser Technology
Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?

Urea
Calcium cyanamide
CAN
Ammonium sulphate

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Fertiliser Technology
Which is the best fertiliser for paddy?

Nitro-phosphate
Potassium nitrate
Ammonium sulphate
Superphosphate

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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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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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Fertiliser Technology
Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because

It is hygroscopic and explosive in nature
It is a liquid at room temperature
Its nitrogen content is very less
It is highly acidic in nature

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