Fertiliser Technology
Though kinetics of ammonia synthesis dictates the use of low temperature for high equilibrium conversion, yet it is kept moderately high (550°C), because at low temperature

None of these
Rate of reaction is very low
Space velocity of gas is very low resulting in decreased conversion
Very high pressure is required resulting in costly pressure vessel

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Fertiliser Technology
Potassic fertilisers

Are useful during early stage of the plant growth
Stimulate early growth and accelerate seeding
None of these
Help in development of starches of potatoes and grain

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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
Higher pumping cost
Chances of entrainment and disturbance of catalyst bed

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