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Fertiliser Technology

Fertiliser Technology
Which of the following does not come under the category of'primary nutrient' for plant growth?

Nitrogen
Phosphorous
Potassium
Sulphur

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Fertiliser Technology
Electric process as compared to wet process (for the manufacture of phosphoric acid)

Is weak acid process
Can use only high grade phosphate rock
Produces a valuable by-product called gypsum
Is used less frequently

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Fertiliser Technology
Dehydration of ammonium carbamate produces

Urea
None of these
Biuret
Ammonia water

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Fertiliser Technology
The essential ingradient of all the synthesis gas is

O₂
CO₂
N₂
H₂

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Fertiliser Technology
Sodium tri poly phosphate (STPP) is chemically represented as

Na₃P4O₆
Na₂PO₄
Na₅P3O₁₀
Na₄P3O₈

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Fertiliser Technology
Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.

All of these
Increased cost of equipment
Increased biuret formation
High corrosion rate

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