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Fertiliser Technology

Fertiliser Technology
Heating of orthophosphoric acid to about 900°C, produces

Pyrophosphoric acid
No change in it
Metaphosphoric acid
None of these

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Fertiliser Technology
C/H ratio (by weight) of naphtha used in nitrogenous fertiliser making is about

6
13
20
2

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

Na₅P3O₁₀
Na₂PO₄
Na₃P4O₆
Na₄P3O₈

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Fertiliser Technology
In ammonia synthesis (N₂ + 3H₂ = 2NH₃), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at

High pressure
Atmospheric pressure; as the pressure has no effect on conversion
Low pressure
Very high temperature

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Fertiliser Technology
During conversion of ammonium carbamate into urea, presence of large excess of water

Reduces the evaporator load by diluting the urea solution
Increases the yield of urea
Adversely affects the yield of urea
Does not affect the yield of urea

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

Oxygen
Magnesium
Calcium
Sulphur

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