Fertiliser Technology
Which of the following nitrogenous fertilisers has the highest percentage of nitrogen?

Calcium ammonium nitrate (CAN)
Calcium nitrate
Ammonium sulphate
Urea

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Fertiliser Technology
Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of

High cost of the high pressure vessel used for the reactor
Comparatively higher pressure drop
Chances of entrainment and disturbance of catalyst bed
Higher pumping cost

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