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

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

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Fertiliser Technology
Ammonium nitrate is

Having about 40% N₂
Not prone to explosive thermal decomposition
Mixed with limestone powder to reduce its explosive nature before using it as a fertilizer
Not hygroscopic

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