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

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

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